Performance and mechanism of photocatalytic degradation of Pravastatin
FAN Jia-min1,2, WANG Lei1,2, LIU Ting-ting1,2, LU Xue1,2, SUN Chen-xu1,2
1. School of Environment and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; 2. Key Laboratory of Membrane Separation of Shaanxi province, Xi'an 710055, China
Abstract：Bi2WO6 was synthesized by hydrothermal method and characterized by XPS, XRD, BET, UV-Vis and SEM. The effects of Bi2WO6 dosage, pH of solution on the photocatalytic degradation of pravastatin (PR) were investigated by photocatalytic performance experiments. And the main active radicals, intermediates and mechanism were ascertained by in situ capture experiments and the identification of intermediates. The toxicities of PR before and after degradation were evaluated by the acute toxicity tests of luminescent bacteria. The results showed that the prepared Bi2WO6 was a flower-like microsphere composed of a large number of nanoplates with orthorhombic crystal. Its mole ratio of elements was Bi:W:O=2.5:1:6.7. Its specific surface area and band gap were 26.67m2/g and 2.74eV, respectively. The optimal conditions for degradation of 10mg/L PR were:0.4g/L Bi2WO6 and pH 6.5. Under this condition, 80.6% PR could be degraded, and the mineralization rate was up to 40.2%. By the detection of active radicals, demonstrated that h+ was the key active radical while ·OH and ·O2- played a supplementary role in this photocatalytic process. The mechanism of photocatalytic degradation of PR was proposed based on the identification of active radicals and intermediates formed during this reaction. The C-C bond, C=C bond, and ester bond of pravastatin were destroyed by the oxidation of h+,·OH and ·O2-, and the PR was decomposed into small easily degradable organic compounds. In addition, the results of toxicity test showed that the small molecule products did not possess higher toxicity than the PR original solution.
樊佳敏, 王磊, 刘婷婷, 陆雪, 孙辰旭. 普伐他汀的光催化降解性能及机理研究[J]. 中国环境科学, 2018, 38(6): 2157-2166.
FAN Jia-min, WANG Lei, LIU Ting-ting, LU Xue, SUN Chen-xu. Performance and mechanism of photocatalytic degradation of Pravastatin. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(6): 2157-2166.
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