Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 176, Issue 1-3, Pages 799-806Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2009.11.105
Keywords
Semiconductor; Interparticle charge-transfer; Photocatalysis; Oxidation
Categories
Funding
- Council of Scientific and Industrial Research (CSIR), New Delhi [01(2031)/06/EMR-II]
- Annamalai University
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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. (C) 2009 Elsevier B.V. All rights reserved.
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