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Available online at JOURNAL OF ENVIRONMENTAL SCIENCES ISSN 1001-0742 CN 11-2629/X Journal of Environmental Sciences 2013, 25(6) 1098–1106 Effects of environmental factors on sulfamethoxazole photodegradation under simulated sunlight irradiation: Kinetics and mechanism Junfeng Niu , Lilan Zhang, Yang Li, Jinbo Zhao, Sidan Lv, Keqing Xiao State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China Received 11 September 2012; revised 04 November 2012; accepted 19 November 2012 Abstract To advance the knowledge of the environmental fate of sulfamethoxazole (SMX), we systematically investigated the effects of natural water constituents and synthetic substances (i.e., TiO nanoparticles (nTiO ) and Ti-doped -Bi O (NTB)) on the photodegradation 2 2 2 3 kinetics of SMX under xenon lamp irradiation. The photolysis of SMX in aqueous solution followed first-order kinetics. Our results showed that higher concentrations of SMX, fulvic ac