13565-96-3Relevant articles and documents
Oxide-ion-conducting phases in the Bi2MoO6-Bi 2VO5.5 system
Voronkova,Kharitonova,Rudnitskaya
, p. 1255 - 1259 (2006)
In search of new oxide-ion-conducting phases, we have synthesized a series of Bi2V1-x Mo x O5.5+x/2 ceramic samples, in which the end-members Bi2VO5.5 (x = 0) and Bi2MoO6 (x = 1) are single-layer Aurivillius phases, possess ferroelectric properties, and offer high oxide-ion conductivity. We have determined the phase composition of the samples and have investigated their electrical properties. The results indicate the formation of narrow ranges of Bi2VO5.5-and Bi2MoO6-based solid solutions (0 2VO5.5-or Bi2MoO6-based solid solutions and compounds isostructural with BiVO4 and Bi 6Mo2O15. Molybdenum doping stabilizes the orthorhombic phase β-Bi2VO5.5 to room temperature, but the solid solutions differ little in electric conductivity from Bi 2VO5.5. The conductivity of the Bi2MoO 6-based solid solutions is higher than that of undoped bismuth molybdate by about a factor of 3.
Fabrication of a heterostructured Ag/AgCl/Bi2MoO6 plasmonic photocatalyst with efficient visible light activity towards dyes
Yan, Qing,Sun, Meng,Yan, Tao,Li, Mengmeng,Yan, Liangguo,Wei, Dong,Du, Bin
, p. 17245 - 17252 (2015)
A ternary Ag/AgCl/Bi2MoO6 plasmonic photocatalyst was successfully fabricated through a two-step synthesis method. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and ultraviolet-visible diffuse reflectance spectroscopy (DRS). The DRS results showed that the visible light absorption of the Ag/AgCl/Bi2MoO6 composite had been greatly enhanced owing to the surface plasmonic resonance (SPR) of Ag0 particles. The SEM and TEM images showed that the obtained flower-like Bi2MoO6 microspheres were composed of nanoplates, on the surface of which Ag/AgCl particles were distributed. In the photocatalytic degradation of dyes, Ag/AgCl/Bi2MoO6 photocatalysts exhibited significantly enhanced activities compared with Bi2MoO6. It was also found that the components of Ag/AgCl/Bi2MoO6 have a great influence on the activity. Controlled experiments proved that the degradation of pollutants over Ag/AgCl/Bi2MoO6 was mainly ascribed to the strong oxidation ability of photo-generated holes. On the basis of band structure analysis and active species trapping experimental results, a photocatalytic mechanism is also proposed. This journal is
An anion exchange strategy for construction of a novel Bi2SiO5/Bi2MoO6 heterostructure with enhanced photocatalytic performance
Liu, Di,Wang, Jun,Wang, Yonggang,Zhu, Yongfa
, p. 3278 - 3285 (2018)
Based on the structural similarity and the driving principle of solubility, we successfully constructed heterostructures of Bi2SiO5/Bi2MoO6 through an anion exchange strategy between Bi2MoO6 starting material and incoming SiO32- ions. By tuning the addition amount of incoming SiO32-, the evolution process of the Bi2SiO5/Bi2MoO6 heterostructures involving phase formation, morphology transformation, and changes in specific surface area and optical properties was clearly identified. More importantly, the heterostructured products displayed remarkably enhanced photodegradation activities under UV and visible light irradiation compared to pure Bi2MoO6, which could be mainly ascribed to the relatively high surface areas, the light-harvesting contribution from the Bi2MoO6 component, and effective separation of photo-generated electron - hole pairs driven by the interfacial potential difference in the Bi2SiO5/Bi2MoO6 heterojunctions.
Hydrothermal synthesis of Sm-doped Bi2MoO6 and its high photocatalytic performance for the degradation of Rhodamine B
Wang, Min,You, Meiyan,Guo, Pengyao,Tang, Hongyang,Lv, Chunmei,Zhang, Yu,Zhu, Tong,Han, Jin
, p. 739 - 746 (2017)
Serials Sm doped Bi2MoO6 photocatalyts with different Sm contents (xSm-Bi2MoO6, x% = 0.0%, 0.4%, 0.6%, 0.8%, 1.0%, 1.2%) were prepared via hydrothermal method to improve the photocatalytic performance of pure Bi
Microwave dielectric properties of low temperature firing Bi 2Mo2O9 ceramic
Zhou, Di,Wang, Hong,Yao, Xi,Pang, Li-Xia
, p. 3419 - 3422 (2008)
Preparation, phase stability, sintering behavior, microwave dielectric properties of single-phase Bi2Mo2O9 ceramic and its chemical compatibility with Ag have been investigated. The single-phase Bi2Mo2O9 ceramic can be well densified in the temperature range from 620° to 645°C with relative density about 96%. X-ray diffraction data show that Bi2Mo2O9 has a monoclinic structure (P21/n), with lattice parameters a=11.9664 Aa, b=10.8089 Aa, and c=11.8871 Aa. When sintering temperature ≥650°C, Bi2Mo3O12 appears as a secondary phase. Pure monoclinic Bi2Mo2O9 ceramic sintered at 620°C for 2 h exhibits good microwave dielectric properties with permittivity about 38, Qf value about 12 500 GHz and temperature coefficient of resonant frequency about +31ppm/°C. The permittivity of single-phase Bi2Mo2O9 corrected for porosity is about 40.17. However, the reaction between Bi 2Mo2O9 and Ag will affect its further application in low-temperature cofired ceramic.
Bi2MoO6 microstructures: Controllable synthesis, growth mechanism, and visible-light-driven photocatalytic activities
Li, Zhao-Qian,Chen, Xue-Tai,Xue, Zi-Ling
, p. 498 - 508 (2013)
The hierarchical flower-like Bi2MoO6 microstructures have been prepared via a facile solvothermal approach, employing ethylene glycol as the reaction medium in the presence of ethylenediamine. The flake-like building units of the hierarchical, flower-like Bi2MoO6 were constructed by many smaller spherical particles. Reaction temperature, reaction time and the volume of ethylenediamine were studied and found to play crucial roles in the formation of the Bi2MoO6 architectures. A possible mechanism in the formation of the microstructures was proposed based on the results of the morphology evolution as a function of reaction time. The hierarchical flower-like Bi2MoO6 were found to exhibit highly efficient visible-light driven photocatalytic activities for the degradation of rhodamine B (RhB). Comparisons of three Bi 2MoO6 microstructures with different morphologies suggest that the morphologies of the products have a great effect on the photocatalytic activities.
Ferroelectric polarization and thin-layered structure synergistically promoting CO2 photoreduction of Bi2MoO6
Bai, Liqi,Huang, Hongwei,Ji, Ning,Li, Shuguan,Lin, Sen,Tian, Na,Yu, Shixin
, p. 9268 - 9277 (2020)
Photocatalytic CO2 reduction for producing solar fuels is promising but severely restricted by the fast recombination of photogenerated electrons and holes and insufficient reactive sites of photocatalysts. Formation of an internal electric field is an effective route for facilitating charge separation, and two-dimensional structure construction is beneficial to increasing catalytic sites. Herein, ultrathin Bi2MoO6 nanosheets with strong ferroelectricity were prepared by a combined CTAB-assisted hydrothermal and corona poling post-treatment process for synergistically improving the CO2 photoreduction activity. Without sacrificial agents and co-catalysts, the polarized Bi2MoO6 ultrathin nanosheets demonstrate a remarkable CO2 reduction activity for CO production with a rate of 14.38 μmol g-1 h-1 in the gas-solid system, over 10 times enhancement than that of bulk Bi2MoO6. The combined strategies considerably promote the separation of photogenerated electrons and holes and enrich the reactive sites for CO2 adsorption, which co-boost the photocatalytic CO2 reduction performance of Bi2MoO6. In addition, a synergistically enhanced effect between corona poling and thin-layered structure was disclosed. This work provides corona poling as an efficient route for promoting charge separation of particulate photocatalysts, and offers new insights into synergistically improving the CO2 photoreduction activity.
N-doped bismuth molybdate decorated with Pt nanoparticles removal azo dyes efficiently via the synergistic effect of adsorption and photocatalysis
Jia, Qi,Nguyen, Phuc Khanh,Gu, Zehao,Zhang, Xiujun,Liu, Min,Tian, Xuefeng,Ma, Lei,Gong, Li,Mu, Xiao,Chang, Yanlong
, (2021)
A promising and highly efficient 0.5%Pt/N-Bi2MoO6 photocatalyst was synthesized by two-step hydrothermal route and NaBH4 reduction method to obtain outstanding adsorption performance and photocatalytic efficiency. The degradation yield obtained by 0.5%Pt/N-Bi2MoO6 composite catalyst for orange II was 90.13%, which was 4 times and 1.8 times higher than that of pure Bi2MoO6 and N-Bi2MoO6, respectively. Such prominent photodegradation efficiency was primarily ascribed to the introduction of Pt and N narrowed the band gap of the bulk Bi2MoO6 material and surface plasmon resonance (SPR) effect triggered by Pt nanoparticles (NPs), which significantly broadened the optical absorption range and improved separation efficiency of electron-hole pairs. Furthermore, the effects of the initial pH of the solution, the initial concentration of the catalyst, the optical properties and the loading of Pt were discussed. Notably, the adsorption process could be described by the Freundlich model, where 1/n = 0.536, indicating that the concentration had a weak influence on the adsorption capacity. Finally, it had been determined that superoxide anion radicals (?O2-) and photogenerated holes (h+) were the main active species for the degradation of orange II.
Effects of rare earth substitution on the optical properties of Bi2MoO6 for coloring applications
Kumari, L. Sandhya,Prabhakar Rao,Sameera,James, Vineetha,Koshy, Peter
, p. 93 - 98 (2015)
A new class of colored inorganic compounds, BiREMoO6 (RE = Pr, Nd, Sm, Tb and Yb) has been synthesized by a solid state route. The substitution of different rare earths for Bi3+ in Bi2MoO6 produces visible light responsive compounds by gently red shifting the absorption edge to low energy side. The visible light absorption is based on the charge transfer transitions from O2p valence band to conduction band made of primary Mo4d and secondary Bi6p. The substitution of RE3+ introduces partially occupied 4f electronic levels in between the band gap and the position of 4f level depend on the number of f electrons which allows tuning the band gap. Thus the rare earth substitution provides an opportunity to tailor the band gap of Bi2MoO6 from 2.99 eV to 2.19 eV. The developed compounds exhibited different shades of yellow hue and demonstrated good coloration to plastics.
Ternary reduced-graphene-oxide/Bi2MoO6/Au nanocomposites with enhanced photocatalytic activity under visible light
Bi, Jinhong,Fang, Wei,Li, Li,Li, Xiaofen,Liu, Minghua,Liang, Shijing,Zhang, Zizhong,He, Yunhui,Lin, Huaxiang,Wu, Ling,Liu, Shengwei,Wong, Po Keung
, p. 28 - 34 (2015)
Abstract A novel ternary nanocomposite photocatalyst consisted of reduced-graphene-oxide (RGO), Bi2MoO6 and plasmonic Au nanoparticles were successfully fabricated by multiple steps including a simple solvothermal process and photochemical reduction process. RGO/Bi2MoO6/Au was characterized by X-ray powder diffraction patterns, transmission electron microscopy, UV-vis diffuse reflectance spectra, Raman spectroscopy and X-ray photoelectron spectroscopy. In comparison with Bi2MoO6, RGO/Bi2MoO6 and Au/Bi2MoO6, RGO/Bi2MoO6/Au exhibits an enhanced photocatalytic activity for decomposition of Rhodamine B under visible light. The separation efficiency of the photogenerated holes and electrons on Bi2MoO6 is promoted by the combined effect of both RGO and Au in the ternary composite, and thus enhances photocatalytic activity. The scavenger study revealed that both hole and superoxide are the major reactive species for the photocatalytic degradation of Rhodamine B using RGO/Bi2MoO6/Au photocatalyst.
Designing Visible-Light-Driven Z-scheme Catalyst 2D g-C3N4/Bi2MoO6: Enhanced Photodegradation Activity of Organic Pollutants
Xia, Kaixiang,Chen, Hanxiang,Mao, Mao,Chen, Zhigang,Xu, Fan,Yi, Jianjian,Yu, Yahui,She, Xiaojie,Xu, Hui,Li, Huaming
, (2018)
Photocatalysis is a promising technology to solve the environment problems. Charge separation efficiency and oxidation capability are both vital factor determining the performance of photocatalysts. In this work, 2D g-C3N4 is applied to modify Bi2MoO6 via an in situ hydrothermal method to design visible-light-driven Z-scheme catalyst. The principle of this structure is to use the opposite surface charge of each component, maintaining the strong redox ability of photogenerated electrons and holes, preventing the recombination of photogenerated carrier effectively. As expected, the photodegradation performance of as-prepared composites enhances dramatically compared with the pure Bi2MoO6. Afterward, kinetics and probable reaction mechanism are investigated and analyzed. It is proved that photogenerated carrier can be separated rapidly by tightly all-solid-state Z-scheme junction. This work can provide a sight for finding controllable synthesis route of obtaining newly efficient visible-light-driven Z-scheme photocatalysts.
Fabrication of hierarchical BiOI/Bi2MoO6 heterojunction for degradation of bisphenol A and dye under visible light irradiation
Yan, Tao,Sun, Meng,Liu, Hongye,Wu, Tingting,Liu, Xiaojie,Yan, Qing,Xu, Wenguo,Du, Bin
, p. 223 - 231 (2015)
A novel hierarchical BiOI/Bi2MoO6 composites are prepared by a facile precipitation-deposition method. The prepared photocatalyst was characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), and X-ray photoelectron spectrometer (XPS). The resulting BiOI/Bi2MoO6 composites exhibit excellent photocatalytic activity and stability towards the degradation of methylene blue (MB) and bisphenol A (BPA) in aqueous solution under visible light irradiation. The optimal composite with 25% BiOI content shows the highest photocatalytic activity for MB degradation. The enhanced photocatalytic activity is mainly attributed to the formation of BiOI/Bi2MoO6 heterojunction that can facilitate the separation and transfer of the photo-generated charge carriers. The roles of active species in the photocatalytic process are discussed by using different types of active species scavengers. Meanwhile, combined with the photoluminescence (PL) and electrochemical impedance spectroscopy (EIS), the degradation mechanism of the photocatalysts is proposed. It is hoped that the work could provide valuable information on the design of specific structure materials with more excellent properties and set the foundation for the further industrial application.
Mixed-calcination synthesis of Bi2MoO6/g-C3N4 heterojunction with enhanced visible-light-responsive photoreactivity for RhB degradation and photocurrent generation
Xiao, Ke,Huang, Hongwei,Tian, Na,Zhang, Yihe
, p. 172 - 178 (2016)
Organic-inorganic hybrid photocatalyst Bi2MoO6/g-C3N4 was synthesized via a mixed-calcination route based on intimate interfacial interaction. The successful combination of g-C3N4 and Bi2MoO6 was verified by X-ray diffraction (XRD), Fourier-Transform infrared spectra (FTIR), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) mapping. The optical property of the as-prepared photocatalysts was characterized by UV-vis diffuse reflectance spectra (DRS). The photocatalytic activities were investigated by degradation of Rhodamine B (RhB) and photocurrent generation under visible-light (λ > 420 nm). The results demonstrated that the Bi2MoO6/g-C3N4 composite exhibits highly enhanced photoreactivity compared to the pristine samples. It should be attributed to the fabrication of a Bi2MoO6/g-C3N4 heterojunction, thus resulting in the high separation and transfer efficiency of photogenerated charge carriers, as confirmed by the photoluminescence (PL) and electrochemical impedance spectra (EIS). The active species trapping experiments indicated that holes (h+) and superoxide radicals (O2-) are the main active species in the degradation process.
Facile fabrication of heterostructured g-C3N4/Bi2MoO6 microspheres with highly efficient activity under visible light irradiation
Yan, Tao,Yan, Qing,Wang, Xiaodong,Liu, Hongye,Li, Mengmeng,Lu, Shixiang,Xu, Wenguo,Sun, Meng
, p. 1601 - 1611 (2015)
A facile and template-free solvothermal method was developed for the synthesis of microspheric g-C3N4/Bi2MoO6 photocatalysts. The obtained g-C3N4/Bi2MoO6 composites were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photo-electron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and ultraviolet-visible diffuse reflection spectroscopy (DRS). The XRD, FTIR, and HRTEM characterization results confirmed the formation of heterojunction structures at the interfaces of g-C3N4 and Bi2MoO6. The DRS results showed that the absorption edges of g-C3N4/Bi2MoO6 composites were red shifted in the visible light region with the increase of g-C3N4 content. The SEM and TEM images revealed that the composites exhibited a microsphere-like morphology and were composed of smaller nanoplates. The elemental mapping images revealed that g-C3N4 and Bi2MoO6 nanoflakes uniformly assembled together to form hierarchical flowers. Compared with pure g-C3N4 and Bi2MoO6, the as-prepared samples exhibited superior photocatalytic activity towards the degradation of dyes (Rhodamine B and Methyl blue) under visible light irradiation. The enhanced photocatalytic activity of g-C3N4/Bi2MoO6 composites could be attributed to their strong visible light absorption, the high migration efficiency of photo-induced carriers, and the interfacial electronic interaction. The electrochemical impedance spectroscopy (EIS) confirmed that the interface charge separation efficiency was greatly improved by coupling g-C3N4 with Bi2MoO6. It was also confirmed that the photo-degradation of dye molecules is mainly attributed to the oxidizing ability of the generated holes (h+) and partly to the oxidizing ability of ·O2- and ·OH radicals. This journal is
Trifiro, F.,Hoser, H.,Scarle, R. D.
, p. 12 - 24 (1972)
Facile deposition of Ag3PO4 nanoparticles on Bi2MoO6 nanoplates by microwave for highly efficient photocatalysis
Nualkaew, Phonthep,Phuruangrat, Anukorn,Kuntalue, Budsabong,Dumrongrojthanath, Phattranit,Thongtem, Titipun,Thongtem, Somchai
, p. 836 - 842 (2017)
A simple microwave method has been successfully developed to effectively produce Ag3PO4/Bi2MoO6 nanocomposites. X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) have been employed to determine the phase and morphology of the as-produced products. The photocatalytic activities were tested through the rhodamine B (RhB) degradation under visiblelight radiation. The interaction between cubic Ag3PO4 nanoparticles and orthorhombic Bi2MoO6 nanoplates has been characterized by XRD and TEM. In this research, the as-produced heterostructure Ag3PO4/Bi2MoO6 nanocomposites display effective photogenerated charge transfer between Ag3PO4 and Bi2MoO6 which can improve charge separation. The 10.0 wt % Ag3PO4/Bi2MoO6 nanocomposites showed the highest photocatalytic performance as high as 4.36 times of the pure Bi2MoO6 sample.
Synthesis of layered perovskite Ag,F-Bi2MoO6/rGO: A surface plasmon resonance and oxygen vacancy promoted nanocomposite as a visible-light photocatalyst
Khazaee, Zeynab,Mahjoub, Ali Reza,Cheshme Khavar, Amir Hossein,Srivastava, Varsha,Sillanp??, Mika
, p. 130 - 143 (2019)
Heterojunction z-scheme based Ag,F co-doped Bi2MoO6/reduced graphene oxide (Ag,F@BMO/rGO) photocatalysts were synthesized via a facile solvothermal method. The present work describes the improved photocatalytic activity of BMO/rGO nanocomposite by co-doping of F? and Ag+ ions, to remove RhB from aqueous solution. The XRD, N2 adsorption, SEM, TEM, EDS, UV–Vis DRS, FT-IR, Raman, and PL measurements were employed to characterize the crystallographic, morphological, and optical properties. X-ray diffraction analysis suggests that crystal growth of all the as-prepared nanoparticles with different F? and Ag+ contents has occurred in Aurivillius phase and the crystal structure did not affected by doping. The insertion of Ag+ and F? into Bi2MoO6 led to a red-shift in the absorption edge of nanocomposite and decrease the band gap energy from 2.78 eV to 2.6 eV, due to the synergetic effects of Surface Plasmon Resonance and surface oxygen vacancy induced by Ag+ and F?, respectively. These beneficial properties are explored toward the photodegradation of RhB under visible-light source, resulting in better yields at lesser exposure time. The photocatalytic activity was significantly influenced by rGO in the nanocomposite, which was 2 times higher than that of pure Bi2MoO6, by effective separation of the charge carriers. The separation behaviors of photogenerated electron-hole were also systematically investigated by the PL. Based on the radical trapping experiments, photogenerated holes and O2 ?? were the main active species in RhB photodegradation and the detailed decolorization pathway has been suggested, using liquid chromatography/mass spectrometry (LC/MS) technique. In addition, the Ag,F@BMO/rGO nanocomposite does not display dramatic reduction of catalytic performance after four recycles, reveals its great prospect and promising application for water purification.
Mechanisms on the enhanced sterilization performance of fluorocarbon resin composite coatings modified by g-C3N4/Bi2MoO6 under the visible-light
Tian, Yu,Zhou, Feng,Zhan, Su,Zhu, Zhenyu,He, Qiuchen
, p. 10 - 16 (2018)
Photocatalysts, which are produced by strong oxidizing groups ([rad]OH, h+, [rad]O2?), could solve marine biofouling problems efficiently. A number of studies showed that the microbial attachment was the original of marine biological attachment, and oxidizing groups inhibit the bacterial activity. In present work, the hybrid g-C3N4/Bi2MoO6 photocatalysts were synthesized via a sonochemical method. The successful combination of g-C3N4 and Bi2MoO6 was characterized by various physicochemical techniques, such as XRD, SEM, TEM, UV–vis and EIS test. As the results showed, the sterilization performance of the PEVE composite coatings was enhanced after adding g-C3N4/Bi2MoO6 under the visible-light irradiation. When the content of g-C3N4 in Bi2MoO6 was 7%, the sterilization performance of composite coatings was prominent under visible light irradiation for 4 h. This finding was attributed to the increased separation efficiency of the photogenerated electron-hole pairs of Bi2MoO6 by g-C3N4, which contributed to the generation of superoxide radicals ([rad]O2?). Meanwhile, we also tested the stability and sterilization performance of 7% g-C3N4/Bi2MoO6/PEVE coating, the results demonstrated that the g-C3N4/Bi2MoO6/PEVE coating has good stability and cycle performance. This work has great significance in the photocatalyst technology as a coating for killing marine bacteria to address marine biofouling problems.
Study of the process of mechanochemical activation to obtain Aurivillius oxides with n=1
Ricote,Pardo,Castro,Millan
, p. 54 - 61 (2001)
Mechanochemical activation has been successfully used as an alternative method for producing Aurivillius oxides with n=1, like Bi2MoO6, Bi2VO5.5, and Bi2VO2. The analysis of the mechanoacti
Highly sensitive and selective photoelectrochemical sensor for mercury(II) detection based on efficient Bi2MoO6 photoanode decorated with CuS
Zhang, Xiaoying,Li, Mengying,He, Lianman,Tian, Dandan,Zhang, Lijuan,Zhang, Jianhua,Liu, Min
, (2021)
Stronger photocatalytic activity and better photoelectrochemical (PEC) performance can Bi2MoO6/CuS photocatalyst accomplish compared to that of pure Bi2MoO6. CuS was also conducive to strengthen the visible light absorption and inhibited the recombination of electron-hole pairs. The addition of glutathione (GSH) in the electrolyte led to a significant enhancement to the reactivity of the PEC sensor in the modified electrode. In contrast, the increase in photocurrent was restrained to a high degree for that the hole scavenging agents were consumed through the addition of mercury (Hg2+). Consequently, the electrode was able to be exploited for Hg2+ detection even though no specific identification component was introduced yet. The wide linear range of 0.5 nM–230 nM and low detection limit of 0.23 nM made the electrode adaptable to the detection of Hg2+ in practical samples. Thanks to a ameliorative PEC performance, thus, the Bi2MoO6/CuS sensor stands a good chance to play a useful part in the detection of Hg2+.
Photoreduction properties of novel Z-scheme structured Sr0.8La0.2(Ti1?δ4+Tiδ3+)O3/Bi2MoO6composites for the removal of Cr(vi)
Liu, Bin,Fan, Zhili,Zhai, Wangjian,He, Junfeng,Wang, Shaofeng,Chen, Fuming,Wang, Yinzhen,Li, Wei,Hou, Xianhua,He, Qinyu
, p. 14007 - 14016 (2021)
Novel Z-scheme structured Sr0.8La0.2(Ti1?δ4+Tiδ3+)O3/Bi2MoO6(LSTBM) composites were preparedviaa facile two-step solvothermal method. Several characterization techniques were employed to investigate the phases, microstructures, compositions, valence states, oxygen vacancies, surface oxygen absorption, energy band structures and lifetime of photoproduced carriers. It was found that the lifetime and transfer of the photoproduced carriers of LSTBM were better than those of Bi2MoO6(BMO) and Sr0.8La0.2(Ti1?δ4+Tiδ3+)O3(LSTO). The LSTBM with a molar ratio of BMO/(LSTO + BMO) = 0.07 (denoted as LSTBM7) showed 1.9 and 3.1 times removal rates than those for BMO and LSTO, respectively. Importantly, the built-in electric field in the heterojunction of LSTBM and Ov-s, especially in Ov-s on the higher-Fermi-level side of the heterojunction, had co-played roles in prolonging the lifetime and improving the transfer of photogenerated carriers. The photoproduced e?played a dominant role in reducing Cr(vi) to Cr(iii) and the produced Cr(iii) tends to form Cr(OH)3and adsorb onto the surface of the photocatalyst to decrease the nucleation energy. The possible reduction route for Cr(vi) to Cr(iii) over LSTBM7 was figured out. This study implies that inducing Ov-s on the higher-Fermi-level side of the Z-scheme heterojunction is a more effective route for separating the photogenerated electrons and holes and improving the transfer of photogenerated carriers.
Hydrothermal synthesis, characterization, and color-tunable luminescence properties of Bi2MoO6:Eu3+ phosphors
Zhang, Junjun,Liu, Yali,Li, Linlin,Zhang, Nannan,Zou, Lianchun,Gan, Shucai
, p. 29346 - 29352 (2015)
In this paper, Bi2MoO6:Eu3+ phosphors were successfully synthesized via a facile, efficient hydrothermal synthesis process followed by a further calcination treatment without using any surfactants. The samples were analyzed by XRD, UV-vis absorption spectroscopy, photoluminescence (PL) and decay curve measurements. XRD patterns reveal that all the diffraction peaks could be indexed to well-crystallized orthorhombic structures. UV-visible diffuse reflection spectra of the prepared Bi2MoO6 and Bi2MoO6:Eu3+ indicate that they had absorption in the UV-light region. The luminescence spectra showed that Bi2MoO6:Eu3+ phosphors can be effectively excited by UV light (328 nm), and exhibited strong red emission around 613 nm attributed to the Eu3+ 5D0 → 7F2 transition. Effects of Eu3+ concentration on lattice constants and PL were presented. This journal is
Ag2O nanoparticles decorated hierarchical Bi2MoO6microspheres for efficient visible light photocatalysts
Geng, Bo,Wei, Bo,Gao, Hong,Xu, Lingling
, p. 783 - 787 (2017)
Nanosized Ag2O decorated Bi2MoO6hierarchical microspheres were successfully prepared and evaluated as efficient visible-light-responsive photocatalysts. X-ray diffraction (XRD) patterns confirmed that the formation of the Ag2O and Bi2MoO6composites while scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDX) results revealed the relatively uniform deposition of Ag2O nanoparticles on the surface of Bi2MoO6microspheres. The visible light photocatalytic activity of the composites was studied by photodegradation of methyl orange (MO) and the composite with Ag to Bi ratio of 1: 1 shows the highest activity due to the effective separation of photocarriers. The photocatalytic mechanism study indicates photogenerated holes play a key role for the dye degradation.
Ultrafine Au nanoparticles anchored on Bi2MoO6 with abundant surface oxygen vacancies for efficient oxygen molecule activation
Guo, Li,Zhao, Qiang,Shen, Huidong,Han, Xuanxuan,Zhang, Kailai,Wang, Danjun,Fu, Feng,Xu, Bin
, p. 3193 - 3202 (2019)
Oxygen molecule activation is one of the most important processes to generate oxygen-containing active free radicals for organic pollutant photocatalytic decomposition. Herein, we demonstrated ultrafine Au nanoparticles (NPs) anchored on porous Bi2MoO6 (BMO) microspheres with rich surface oxygen vacancies (SOVs) planted via a simple chemical reduction-deposition method, which could effectively enhance the separation of photogenerated carriers for oxygen molecule activation, and thus lead to a more efficient photocatalytic decomposition ability of the phenol and dye. The sample (4.0% Au/Bi2MoO6) exhibited a remarkable photocatalytic performance for phenol, which is 15 times higher than BMO. The systematic studies indicate that the excellent photocatalytic activity of Au/Bi2MoO6 should be ascribed predominantly to the synergistic effect between SOVs, Au NPs and BMO. Both SOV and Au NP surface plasmonic resonance (SPR) can not only improve the separation and migration of the photogenerated electron (e-)/hole(h+) pairs, but can also broaden the light responsive spectra, and thereby facilitate the oxygen molecule activation. It also reveals that the photocurrent intensity of the 4% Au/BMO sample is approximately 36-fold larger than that of pure BMO, and the ESR signal intensities of O2- and OH for Au/BMO exhibit an enhancing tendency compared to pure-BMO, demonstrating that SOVs and Au NPs are responsible for the promoted photocatalytic activity of the Bi2MoO6 nanostructure. Furthermore, the band gap position of Au/BMO was determined by employing UV-vis-DRS spectra, VB-XPS and Mott-Schottky plots, thus the enhancement mechanism of oxygen molecule activation is further elucidated.
THERMAL DECOMPOSITION OF THE 1:1 BISMUTH MOLYBDATE AND ITS IMPLICATIONS FOR CATALYTIC OXIDATION.
Kumar,Ruckenstein
, p. 41 - 46 (1980)
To study the stability of the 1:1 bismuth molybdate, thin films (300-500 A) have been prepared by thermal evaporation of the powder samples followed by heating in air or oxygen. Electron diffraction revealed that in an oxidizing atmosphere and at temperatures higher than 400 degree C or in vaccum and at temperatures higher than about 350 degree C the 1:1 compound decomposes into the 2:1 bismuth molybdate and MoO//2. These results suggest that during catalytic oxidation and (at least) for temperatures greater than 400 degree C the 2:1 compound forms near the surface of the 1:1 phase, being responsible for the selective catalytic oxidation.
Surface oxygen vacancies modified Bi2MoO6 double-layer spheres: Enhanced visible LED light photocatalytic activity for ciprofloxacin degradation
Dong, Shuying,Fan, Maohong,Jin, Gege,Liu, Xiaodan,Sun, Jianhui,Tian, Gege,Wang, Yi,Zhao, Yinlan
, (2021/10/12)
Oxygen vacancies can regulate the energy band structure of semiconductor photocatalytic materials, and serve as electron traps and active sites to improve the photocatalytic activity of the photocatalyst. Herein, we prepared Bi2MoO6 flower spheres with a double-layer structure by a simple solvothermal method, and achieved the controllable introduction of oxygen vacancies through subsequent air calcination at different temperatures. The double-layer structure of Bi2MoO6 improved the light absorption because of multiple reflections. Compared with the pristine Bi2MoO6, the introduction of oxygen vacancies regulated the energy band structure of Bi2MoO6, improved the separation and transfer rate of electron-hole pairs, and produced more active species such as h+ and 1O2. Among all samples prepared, BMO-350 had the best activity, which could degrade 90.6% of ciprofloxacin (10 mg/L) within 80 min under the irradiation of 6000 K visible LED light. While under ultraviolet, 3000 K, 4500 K, 6000 K visible, red Led light and xenon lamp irradiation, the CIP degradation efficiency reached 94.9%, 73.77%, 85.9%, 89%, 16.24%, and 94.7%, respectively, demonstrated that the appreciable photocatalytic activity under the low energy light source.
