Two mesoporous metal oxides, Al2O3 and Fe2O3, were evaluated as regards their ability to remove simazine, a highly persistent herbicide of s-triazines, using a batch equilibrium method. The effect of several experimental parameters such as pH, contact time, initial concentration and sorbent dosa...
Thin films of (NiPcR8, with R = NHSO2(C6H4)CH3 and CH2N(SO2C6H4CH3)CH2(CH2)8CH3 have been prepared by spin coating onto gold-coated slides and applied as active layers for the detection of simazine using Total Internal Reflection Ellipsometry (TIRE) technique. Solutions of simazine in deionised ...
Removal of simazine from aqueous solution by Fenton's reagent oxidation was investigated. Box–Behnken statistical experiment design and the response surface methods were used to investigate the effects of simazine, H2O2 and Fe (II) concentrations on simazine degradation and mineralization....
Simazine is a soil-active herbicide that has been applied worldwide in agricultural soils, being the second most commonly detected herbicide in groundwater and surface waters. Although its use has been restricted in many countries of Europe, it is still applied in many locations around the world...
The metalloporphyrin-mediated simazine oxidation was investigated, in order to evaluate whether metalloporphyrins were good biomimetic models for the oxidation of this herbicide. The commercially available second-generation metalloporphyrins: 5,10,15,20-tetrakis(2,6-dichlorophenyl)porphyrin meta...
A novel molecularly imprinted sol-gel material based on polysiloxane nanofiber was introduced as a solid-phase microextraction coating on a stainless steel wire for the extraction of simazine. The nanostructured molecularly imprinted fiber was prepared by a simple single step method at room temp...
The nano-size gold loaded visible light driven Au–TiO2 nanophotocatalysts were synthesized using a commercial sonicator bath producing 42 kHz ultrasound. The X-ray diffraction (XRD), transmission electron microscopy (TEM) and high angle annular dark field (HAADF) scanning transmission electron ...
Simazine is an s-triazine herbicide world widely used for the control of broadleaf weeds. The influence of leaching and microorganisms on simazine attenuation in an agricultural soil long-term treated with this herbicide was studied. To elucidate the leaching potential of simazine in this soil, ...
Two porous silica samples were synthesized through the sol–gel technique and characterized in terms of surface area and pore size distribution. The ability of such samples in removing simazine from polluted waters by adsorption was evaluated by investigating the main process parameters (pH, tim...
The occurrence and distributions of simazine, and its environmental behaviors were studied in Taizi River, China. Results showed that concentration of simazine in surface water and suspended solids (SS) were in the range of 35–1150 ng L−1and 0.00–1075 ng g−1 with mean value of 240.26 ng L−1 an...
The phase equilibria of biodiesel systems, which are comprised of mixtures of triolein, methanol, carbon dioxide, methyl-oleate, glycerol, and water, are analyzed using PC-SAFT in ASPEN PLUS and SAFT-γ Mie in gPROMS (gSAFT) for systems in the vicinity of their critical point. Pure-species densi...
This manuscript presents new phase equilibrium data for capsanthin in pure and triolein-entrained Supercritical (SC) carbon dioxide (CO2). The aim of the work was to determine the cosolvent effect of triolein on capsanthin by comparing solubility results in a ternary (CO2 + triolein + capsanthin...
Linear free energy relationships, LFERs, have been constructed for water-triolein partition coefficients for neutral species. It is shown that separate equations are required for wet and dry triolein. From a comparison of the equation coefficients for water-wet triolein with those for 52 other w...
Monodisperse, millimeter-sized, lipase-entrapped NIPA-co-PEGMEA (N-isopropylacrylamide-co-poly(ethylene glycol) methyl ether acrylate) gel beads were prepared by sedimentation polymerization. The feasibility of the lipase-entrapped gel for use in biodiesel fuel (BDF) production was evaluated by ...
A series of modified hexagonal mesoporous silica (HMS) supported by various Ni loading (5 wt% Ni, 10 wt% Ni, 40 wt% Ni and 100 wt% Ni) have been synthesized and systematically characterized. The resultant Ni catalysts improved the performance of the deoxygenation (DO) of triolein at a reaction t...
The biodiesel fuel ethyl oleate (fatty acid ethyl ester, FAEE) was produced using Novozym® 435 (immobilized lipase) by transesterification of a mixture of ethanol and triolein in a fixed-bed reactor operated in circulating batch mode. The miscibility of the mixtures during transesterification wa...
BackgroundCytokine production and oxidative stress generated by ultraviolet radiation B (UVB) skin exposure are main factors of skin photoaging. Interleukin-6 (IL-6) produced by irradiated keratinocytes is proposed to have a role in metalloproteinases (MMPs) expression activation in dermal fibro...
Biodiesel was produced from transesterification of triolein with excess methanol using NaOH-treated kaolin clay as an active catalyst. The natural kaolin was first transformed into an efficacious catalyst under the conditions as (1) calcined kaolin/NaOH(aq) = 1/2 (w/w), and (2) hydrothermal agin...
In spite of the importance of the triglyceride aqueous interface for processes like emulsification, surfactant interactions and lipase activity, relatively little is known about this interface compared to that between alkanes and water. Here, the contact between triolein and water was investigat...
The demand for biofuels, such as biodiesel, has a very powerful appeal nowadays. In some countries, such as Brazil, the biodiesel production by ethylic route has some advantages, since ethanol is a renewable alcohol produced in a large scale and at a competitive production cost. Besides being an...
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