547-68-2Relevant articles and documents
Non-isothermal studies for the decomposition course of CdC 2O4-ZnC2O4 mixture in air
Gabal
, p. 55 - 62 (2004)
The thermal decomposition of cadmium-zinc oxalate (1:1mol ratios) mixture in air was investigated by non-isothermal thermogravimetric analysis. Intermediates and the final products were characterized by X-ray diffraction and scanning electron microscopy techniques. TG showed that the mixture dehydrated in two steps and decomposed exothermically to CdO-ZnO mixture at 390°C in a further two steps. The observed increase in the intensity of the X-ray diffraction lines by raising the calcination temperature from 400 to 800°C is attributed to the grain growth of CdO-ZnO mixture as revealed from SEM experiments. The kinetics of the oxalate decomposition steps was performed using the various reaction interface models and differential techniques of computational analysis of non-isothermal data. The activation parameters, calculated using the integral composite method, showed that the reactions were best described by the random nucleation model characteristic of solid state nucleation growth mechanism. The results of activation parameters for the different decomposition steps are compared and discussed.
Synthesis, crystal structure, and properties of two zinc(II) complexes with 2-propyl-4,5-imidazoledicarboxylic acid
Luo, Zhirong,Zhuang, Jichang,Wu, Qiaolan,Yin, Xianhong,Zheng, Xiaoxia,Wei, Huan
, p. 455 - 462 (2012)
A tetradentate 2-propyl-4,5-imidazoledicarboxylic acid [H3pimdc] reacts with zinc sulfate in the ethanol aqueous solution and zinc acetate in the N,N-dimethylformamide (DMF) aqueous solution to give two complexes [Zn(H 2pimdc)2(H2O)2]·4H 2O and [Zn(H2pimdc)2(H2O) 2]·2DMF. The complexes were characterized by X-ray single crystal analysis, thermal analysis, and IR spectrum. Because of the different coordination of water, complex 1 forms a fishing net-like latticed topology geometry via hydrogen bonds and π-π stacking interaction, but complex 2 forms a layer-like topology geometry via hydrogen bonds and π-π stacking interaction. Copyright Taylor & Francis Group, LLC.
Solar photocatalytic and self-cleaning performances of HoVO4 doped ZnO
Thirumalai, Kuppulingam,Shanthi, Manohar,Swaminathan, Meenakshisundaram
, p. 178 - 187 (2018)
In this article we report preparation of 5 wt% HoVO4 doped ZnO via template-free hydrothermal process and investigated its photocatalytic activity against azo dyes Rhodamine-B (Rh-B), Trypan Blue (TB) and Acid Black 1 (AB 1) in solar light irradiation. Th
Synthesis of ZnO nanoparticles for varistor application using Zn-substituted aerosol OT microemulsion
Singhal,Chhabra,Kang,Shah
, p. 239 - 247 (1997)
This paper describes a new method for the synthesis of zinc oxide nanoparticles using ethanol-in-oil microemulsions with Zn-DEHSS (diethylhexyl sulfosuccinate) as surfactant. The zinc oxide nanoparticles find application in varistors and other functional devices. These particles have been characterized by X-ray diffraction, TEM, and BET surface area. Microemulsion droplets were characterized by quasi elastic light scattering (QELS). Varistors formed from doped zinc oxide nanoparticles finds application as low voltage surge devices with low leakage current and high coefficient of nonlinearity (α). In this paper, we have shown that the critical voltage of the varistor is related to the grain size which is related to size of ZnO particles. The smaller ZnO particles lead to larger grain size, thereby lowering the critical voltage.
Huettig,Klappholz
, p. 225,228 (1932)
Giovanoli,Wiedemann
, p. 1134,1135,1138,1139,1148 (1968)
Defect-enhanced photocatalytic activity of ZnO micro/nanostructures
Wang, Yu,Yan, Mei,Chen, Qinguo,Peng, Yin
, p. 1557 - 1563 (2013)
ZnO micro/nanocrystals with controlled oxygen defects are successfully prepared through annealing precursors obtained via a simple solvothermal method. The size and surface defects of the as-synthesized ZnO micro/nanocrystals increase with the solvent volume ratio of water/ethanol increasing; the BET surface areas of the corresponding samples decrease during these processes; photoluminescence reveals that the type and concentration of surface defects (oxygen vacancy and interstitial oxygen) are quite different for the samples prepared via different solvent volume ratio of water/ethanol. In addition, it is found that the photocatalytic activity of the synthesized ZnO nanocrystals is mainly dependent on the concentration of surface defects. The sample with more surface defects exhibits higher photocatalytic activity toward the degradation of methylene blue (MB). The possible photocatalytic mechanism is discussed in detail. Copyright
Photocatalytic oxidation of methane over CuO-decorated ZnO nanocatalysts
Li, Zhonghua,Pan, Xiaoyang,Yi, Zhiguo
, p. 469 - 475 (2019/01/09)
Catalytic oxidation of methane under mild conditions remains a challenge in the industrial catalytic processes. Herein, we report a highly efficient CuO/ZnO nanocomposite photocatalyst for methane oxidation under ambient conditions. It was found that both the CH4 photooxidative activity and stability over ZnO are considerably improved by loading a tiny amount of CuO, though CuO itself exhibits no activity on methane oxidation. On the basis of the experimental results in conjunction with in situ electron paramagnetic resonance (EPR) and Fourier transform infrared spectroscopy (FTIR) studies, the photocatalytic reaction process of CH4 over CuO/ZnO composite microstructures is comprehensively discussed.
