Degradation of terbuthylazine by TiO2 visible photocatalysis with electro-generated Fenton reagent assistance
TANG Jian-jun1, CHEN Yi-qing1, JIANG Tao2, YANG Sheng-hai2
1. School of Construction and Environmental Engineering, Shenzhen Polytechnic, Shenzhen 518055, China;
2. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China
A electro-chemical reactor with H2O2 in-situ generation was designed, which using net structure Ir_Ta oxide coated Ti metal as anode, and platelike graphite as cathode, the degradation of terbuthylazine by TiO2 visible-light photocatalysis with electro-generated Fenton reagent (electrogenerated H2O2 and Fe3+) assiatance was also studied. Terbuthylazine could be degraded by TiO2 visible-light photocatalysis with electrogenerated H2O2 assiatance, and the degradation ratio could be 100% after 180 min reaction. Snergistic degradation of terbuthylazine was evidently fast when additionally adding Fe3+, its degradation ratio could be 100% after 30 min reaction. In the degradation process of terbuthylazine, dechlorination was first carried out, and tert-butyl, ethyl, amino groups were then oxidized. Spectrum analysis indicated that the reaction process was predominated by the hydroxyl free radical (·OH) and superoxide radical (·O2-) generation in the system.
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