Photocatalytic decolorization of crystal violet in aqueous nano-ZnO suspension under visible light irradiation

Abstract

This article presents a method for the electrochemical preparation of a coating of nickel-silica nanocomposites on a carbon steel substrate. The incorporation of hydrophilic silica particles into the Ni composite coating during co-electrodeposition is so difficult due to the small size and the hydrophilicity of SiO 2 particle, generally less than 2 v% of silica is incorporated into the composite at different current densities, agitation speeds and silica concentrations. The effect of the presence of four surfactants, namely cocamidopropyl betaine (CAPB), decylglycoside (DG), cetyltrimethyl ammonium chloride (CTAC) and ammonium lauryl ether sulfate (ALES), on overcoming this problem was investigated in this research, and the surfactants were found to greatly influence the surface charge of silica, silica incorporation percentage and the microstructure of the composite. In fact, upon increasing the internal stresses, the products prepared in the presence of CAPB and DG were found to crack to some degree. CTAC was found to lead to entrapment mode silica co-deposition in the Ni coating. Furthermore, the addition of ALES into an electrolyte bath negatively supercharged silica surfaces and increased silica dispersion, which led to a dramatic increase in the silica incorporation percentages to around 14 v%. The results showed that Ni-SiO 2 composites prepared in the presence of ALES had better corrosion resistance, hardness and wear properties.

Graphene oxide coated wad as a new sorbent in fixed bed column for the removal of crystal violet from contaminated water

“…The amount of uptakes increase from 52.14 to 58.62 mg/g with increasing the dye concentration (30.0-80.0 ppm), which can be reasonably attributed to the fact that high concentration provides greater driving force for the transfer process to overcome the mass transfer resistance in the packed bed [27]. On the other words, all adsorbents have a limited number of active sites, which become saturated at a certain concentration, whatever the initial concentration is grater the saturation of sorbent or equilibrium loading is faster [28]. Table S1.…”

Heterogeneous Fenton-like oxidation of crystal violet using an iron loaded ZSM-5 zeolite

“…A 91.9% TOC removal was obtained in 1 h the by homogeneous Fenton-like oxidation of CV [10]. A TOC removal of 65% was achieved in 300 min by the photocatalytic decolorization of CV in an aqueous nano-ZnO suspension under visible light [20].…”

Determination of the half-life and the quantum yield of ZnO semiconductor photocatalyst in humic acid

“…ZnO more efficient, such as resistant to corrosion, has a are relatively low light energy (Eg = 3.40 eV), and is much cheaper than TiO 2 (6) Research photocatalyst ZnO has been made include studies in nano material of ZnO [7][8][9][10][11][12][13][14][15]. The commercial ZnO powder was used economically and directly for application on water purification.…”