A B S T R AC TIn this study, photocatalytic removal of Cr(VI) and Ni(II) by illuminated TiO 2 was investigated with variation of solution pH, contact time, TiO 2 dosage and initial Cr(VI) and Ni(II) concentration. From the photocatalytic reaction, near complete elimination of Cr(VI) and Ni(II) occurred from the adsorption of Cr(VI) and Ni(II) on the surface of TiO 2 as well as reduction of Cr(VI) and Ni(II) to Cr(III) and Ni(0), respectively. Reduction was recognized as a signifi cant elimination process for the treatment Cr(VI) and Ni(II) from wastewater. Removal of Cr(VI) decreased with increasing pH while removal of Ni(II) increased with increasing pH. TiO 2 dosage was also an important parameter for the removal of Cr(VI). As the TiO 2 dosage increased up to 1 g l −1 , removal of Cr(VI) and Ni(II) was continuously enhanced.
Removal of nutrient salts from the receiving water is an important consideration to control eutrophication.Among various nano sized materials, ZnO and Fe 3 O 4 have much attention because ZnO nanoparticles exhibit efficient photocatalytic removal efficiency through adsorption and decomposition of organic contaminants. In this study, commercial magnetite was immobilized with ZnO by chemical wet method and it was used as an adsorbent to remove phosphate from aqueous solution. The phosphate adsorption can be well modeled by the Response Surface Methodology. The removal efficiency of phosphate was optimized as the function of adsorbent dosage, pH, initial phosphate concentration, and contact time, using Response Surface methodology.
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