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Effective degradation of tetracycline by mesoporous Bi2WO6 under visible light irradiation
Xiaolong CHU, Guoqiang SHAN, Chun CHANG, Yu FU, Longfei YUE, Lingyan ZHU
Front. Environ. Sci. Eng. ›› 2016, Vol. 10 ›› Issue (2) : 211-218.
Effective degradation of tetracycline by mesoporous Bi2WO6 under visible light irradiation
Bi2WO6 was synthesized with a hydrothermal method at different pHs and used for the degradation of tetracycline (TC) in water. The mesoporous Bi2WO6 prepared at pH 1 (BWO-1) displayed the highest adsorption and degradation capacity to TC due to its large surface area and more efficient capacity to separate photogenerated electrons and holes. 97% of TC at 20 mg·L−1 was removed by BWO-1 at 0.5 g·L−1 after 120 min irradiation under simulated solar light. Only 31% of the total organic carbon (TOC) was removed after 360 min irradiation although the TC removal reached 100%, suggesting that TC was mainly transformed to intermediate products rather than completely mineralized. The intermediates were identified by high-performance liquid chromatography-time of flight-mass spectrometry (HPLC-TOF-MS) and possible photodegradation pathways were proposed.
Bi2WO6 / hydrothermal synthesis / tetracycline (TC) / photocatalysis
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