【摘要】 以典型抗生素类药物磺胺甲噁唑(SMZ)为目标物,模拟太阳光下研究其在磷钨酸/二氧化钛(H3PW12O40/TiO2)复合膜上的光催化降解行为,并对其可能的降解机理进行探讨.通过一系列的条件实验确定H3PW12O40/TiO2复合膜光催化降解SMZ的最佳实验条件为:H3PW12O40掺杂量为7.7%、污染物初始浓度为50 mg·L-1、溶液pH值为5.5.此时,H3PW12O40/TiO2复合膜表现出最强的光催化活性,其动力学常数为0.453 h-1,为纯TiO2膜的3.0倍;模拟太阳光照射12 h后,复合膜对SMZ的矿化度可达66.6%,是纯TiO2膜的1.25倍.更多还原

【Abstract】 Photocatalytic degradation of sulfamethoxazole( SMZ), a typical antibiotic, was performed using phosphotungstic acid / titanium dioxide( H3PW12O40/ TiO2) composite film under simulated sunlight irradiation. The possible degradation mechanism was also discussed. Based on a series of experiments,the optimum conditions for SMZ degradation were determined as: H3PW12O40 loading amount of 7.7%,initial SMZ concentration of 50 mg·L-1,and the solution pH of 5.5. Under this optimal condition, the kinetic constant of SMZ degradation using H3PW12O40/ TiO2was 0. 453 h-1,which was 3 times as large as that using pristine TiO2. After 12 h of illumination,SMZ mineralization was 66.6%,which was 1.25 times as large as that using TiO2.更多还原