Department of Chemistry, Annamalai University, Annamalainagar 608002, Tamilnadu, India.
J Hazard Mater. 2010 Apr 15;176(1-3):799-806. doi: 10.1016/j.jhazmat.2009.11.105. Epub 2009 Nov 26.
Degradation of phenol on suspended TiO(2), ZnO, CdO, Fe(2)O(3), CuO, ZnS and Nb(2)O(5) particles under UV-A light exhibit identical photokinetic behavior; follow first-order kinetics, display linear dependence on the photon flux and slowdown with increase of pH. All the semiconductors show sustainable photocatalytic activity. Dissolved O(2) is essential for the photodegradation and oxidizing agents like H(2)O(2), Na(2)BO(3), K(2)S(2)O(8), KBrO(3), KIO(3) and KIO(4), reducing agents such as NaNO(2) and Na(2)SO(3) and sacrificial electron donors like hydroquinone, diphenyl amine and trimethyl amine enhance the degradation. However, the photocatalysis is insensitive to pre-sonication. Two particulate semiconductors present together, under suspension and at continuous motion, enhance the photocatalytic degradation up to about four-fold revealing interparticle electron-jump.
悬浮 TiO(2)、ZnO、CdO、Fe(2)O(3)、CuO、ZnS 和 Nb(2)O(5)颗粒在 UV-A 光下降解苯酚表现出相同的光动力学行为；遵循一级动力学，显示与光量子通量的线性关系，并随 pH 值的增加而减缓。所有半导体都表现出可持续的光催化活性。溶解氧对于光降解是必不可少的，而氧化剂如 H(2)O(2)、Na(2)BO(3)、K(2)S(2)O(8)、KBrO(3)、KIO(3)和 KIO(4)、还原剂如 NaNO(2)和 Na(2)SO(3)以及牺牲电子供体如对苯二酚、二苯胺和三甲胺则可以促进降解。然而，光催化对预超声不敏感。两种颗粒状半导体在悬浮和连续运动状态下同时存在，可将光催化降解提高约四倍，表明颗粒间电子跳跃。
