conclusions the uv/zno system has been found an effective process with 90.2% cod removal and 95.6% dye removal after 50 minutes treatment. materials and methods in this work, zno catalyst and mercury lamp (uv-c, 254 nm) have been applied for removal of the c.i. sulphur red 14 dye from aqueous environments. the influence of various parameters such as the amount of zno, initial dye concentration,...

High crystallinity of ZnWO4 nanoparticles has been successfully synthesized via a highly effective and environmentally friendly microwave route by controlling the reaction time and temperature. The products were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and Fourier infrared spectrum (FT-IR). The crystallinity was enhanced with the increase of the r...

background: methyl tert -butyl ether (mtbe) has been commercially used as an octane enhancer to replace tetraethyl lead in gasoline since 1979. the high mobility, water solubility, and resistance to natural attenuation associated with mtbe may re­sult in contamination of ground and surface waters. in this investigation the degradation of aqueous mtbe at relatively high concentrations was studie...

The tin-doped TiO2 powders obtained by sol-gel and microwave-assisted methods were investigated. synthesis took place in a basic medium (pH 10, ammonium hydroxide, 25%) starting from tetrabutyl orthotitanate its parental alcohol. In the case of dopant, Tin(II) 2-ethylhexanoate as SnO2 precursor was used amount 1, 2, or 4 mol % SnO2. Based on thermal analysis data, thermally treated air, at 500 ...

A Keggin polyoxometalate (POM, i.e., PW12O40(3-)) and its lacunary derivative are immobilized on an anionic exchange resin through electrostatic interaction at pH 4.6 in an aqueous dispersion. The resin-supported POM thus obtained catalyzes the efficient degradation of cationic dye pollutants in the presence of H2O2 under visible-light irradiation. To evaluate the photocatalytic system, degrada...

Transparent TiO(2) and TiO(2)-ZrO(2) (molar ratio Zr/Ti = 0.1) thin films were produced by low-temperature sol-gel processing from nanocrystalline aqueous based solutions. The structural features and compositions of the films treated at room temperature, 100 degrees C and 500 degrees C were investigated by X-ray diffraction, X-ray photoelectron spectroscopy and thermal analysis. Addition of zir...

Present research work reports the synthesis of visible light-active ZnO photocatalyst through modification with N/GO and Fe2O3/GO. Modified samples are characterized by XRD. Photocatalytic activities measured in waste water consist organic pollutants such as Malachite green (MG). N-ZnO/GO exhibited better photocatalytic degradation compare to Fe2O3 doped ZnO. Dye follow first order kinetic rate...