Visible light photocatalysis of a textile dye over ZnO nanostructures covered on natural diatomite

Authors : Reza Darvishi Cheshmeh SOLTANI, Zohreh HAGHIGHAT

Pages : 454-466

View : 16 | Download : 11

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :In the present study, ZnO nanostructures were ultrasonically synthesized and immobilized on the surface of diatomite and used for visible light photocatalysis of Acid Red 88 insert ignore into journalissuearticles values(AR88); in the aqueous phase. Scanning electron microscopy insert ignore into journalissuearticles values(SEM); and X-ray diffraction insert ignore into journalissuearticles values(XRD); analyses were employed for characterization of the samples. The process was optimized via response surface methodology insert ignore into journalissuearticles values(RSM); on the basis of central composite design insert ignore into journalissuearticles values(CCD);. Based on numerical optimization, for the maximized color removal of 96% the initial dye concentration, the catalyst dosage, the reaction time, and the initial pH were 13 mg/L, 1.5 g/L, 85 min, and 4, respectively. The initial pH produced the largest effect, while the adsorbent dosage represented the lowest individual effect on the photocatalysis of AR88. The reusability test showed a 20% reduction in decolorization efficiency insert ignore into journalissuearticles values(%); within four consecutive experimental runs. Overall, ZnO-diatomite nanocomposite can be applied as an efficient photocatalyst for the visible light photocatalysis of target organic dyes.
Keywords : Organic dye, photocatalysis, visible light, nanocrystalline ZnO, immobilization