Enhanced removal of bisphenol A by cyclodextrin in photocatalytic systems: Degradation intermediates and toxicity evaluation
Enhanced removal of bisphenol A by cyclodextrin in photocatalytic systems: Degradation intermediates and toxicity evaluation
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光催化系统中环糊精强化去除双酚A：降解中间体和毒性评估
DOI：
10.1016/j.cclet.2020.02.008
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发表时间：
2020-02
影响因子：
9.1
通讯作者：
Yanbo Zhou
中科院分区：
文献类型：
--
作者：
Yi Zhou;Jie He;Jian Lu;Yongdi Liu;Yanbo Zhou
目前对光氧化系统的评价主要集中在对目标污染物的光降解效率上，缺乏对光催化过程中毒性的评价。本文以双酚A （BPA）为研究对象，研究了几种环糊精改性光催化剂的光分解性能。研究了不同光催化氧化条件下双酚a的综合毒性变化。由β-环糊精（β-CD）修饰的二氧化钛（CM-β-CD-TiO2）、氮化碳（CM-β-CD-C3N4）和硫化镉（SH-β-CD-AM/CdS）对BPA具有较高的降解率和矿化效率。SH-β-CD-AM/CdS纳米反应器氧化体系对BPA的总有机碳去除率最高（73.4%）。采用基于定量构效关系（QSAR）预测的毒性评价软件（T.E.S.T.）对不同体系中BPA及其氧化中间体的综合毒性进行了比较。结果表明，β- cd能促进目标污染物的光分解。然而，许多综合毒性较高的氧化中间体，即使在高BPA去除率的氧化系统中，仍然可以检测到。因此，评价光催化技术的指标不仅应包括目标污染物的分解，还应包括氧化中间体的综合毒性。
At present, the assessment of photooxidation system mainly focuses on the photodegradation efficiency of target pollutant, lacking of the toxicity assessment in the photocatalysis process. Here, photodecomposition of bisphenol A (BPA) was used to investigate the performance of several cyclodextrin modified photocatalysts. Moreover, the comprehensive toxicity changes of BPA under different photocatalytic oxidation conditions were conducted. Theβ-cyclodextrin (β-CD) modified photocatalyst, including titanium dioxide (CM-β-CD-TiO2), carbon nitride (CM-β-CD-C3N4) and cadmium sulfide (SH-β-CD-AM/CdS) exhibit high degradation rate and mineralization efficiency of BPA. The highest total organic carbon (TOC) removal of BPA observed in the oxidation system of SH-β-CD-AM/CdS nanoreactor (73.4%). The main oxidation intermediates in these systems were detected, and the comprehension toxicity of BPA and its oxidation intermediates in different system were compared by toxicity estimation software tool (T.E.S.T.) based on quantitative structure-activity relationship (QSAR) prediction. The results show thatβ-CD can facilitate the photodecomposition of the target contaminant. However, many oxidation intermediates with high comprehensive toxicity, even in the oxidation system with high BPA removal, can still be detected. Therefore, not only decomposition of target contaminant but also the comprehensive toxicity of oxidation intermediates should be regarded as index to evaluate a photocatalysis technology.
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