| 硫掺杂二氧化钛的光催化活性及其对微囊藻毒素的降解 |
| Photocatalytic Activity of Sulfur Doped TiO2 and Degradation of Microcystin-LR |
| 投稿时间：2017-01-13 修订日期：2018-09-13 |
| DOI：10.15928/j.1674-3075.2018.05.014 |
| 中文关键词:硫 二氧化钛 光催化 微囊藻毒素 |
| 英文关键词:sulfur titanium dioxide photocatalysis microcystin-LR |
| 基金项目:上海市虾类产业技术体系建设项目（沪农科产字（2014）第5号；上海市教委重点学科建设项目(No.J50701)；上海市高校知识服务平台项目（No.ZF1206）。 |
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| 中文摘要: |
| 为了更方便高效和绿色环保处理水中的微囊藻毒素（MC-LR），采用溶胶-凝胶法制备了硫（S）掺杂的二氧化钛（TiO2）纳米光催化剂粉体（S-TiO2），利用X射线光电子能谱（XPS）、X射线衍射（XRD）以及紫外可见光的反射光谱，分析测定了催化剂的结构特征，并以浓度为0.1 μg/mL的MC-LR的光降解效果考察了其光催化活性，研究其光降解条件。结果表明，本实验制备的催化剂为锐钛矿结构，S以S+6的形式进入TiO2晶格。催化剂的最优制作工艺为：掺杂量（[S]/[Ti]）0.25，500℃下煅烧3 h，且制备的S-TiO2具有较好的稳定性和回收性，重复利用5次，降解率仅下降3.98%；最优MC-LR可见光降解工艺为：光强3000 lx，催化剂投加量0.1 g/L，反应时间16 h。在此催化剂制备条件以及可见光降解反应条件下，MC-LR的降解率为100%，残留量低于WHO规定的藻毒素含量限值。 |
| 英文摘要: |
| In order to remove microcystin (MC-LR) more easily, efficiently and eco-friendly, the sol-gel method was used to synthesize a sulfur doped TiO2 photocatalyst (S-TiO2). The catalyst was characterized using UV-VIS diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Photocatalytic degradation of the cyanotoxin microcystin-LR (MC-LR, 0.1 μg/mL) under visible was investigated to identify optimal conditions for S-TiO2 synthesis and for MC-LR degradation. Results show that the TiO2 crystal phase is anatase and the sulfur is fully oxidized, S(VI). The optimal conditions for S-TiO2 synthesis is a mole ratio (S:Ti) of 0.25 and calcining the product at 500 ℃ for 3h. The S-TiO2 photocatalyst was stable and the degradation rate decreased only 3.98% after five cycles of recovery and reuse. At a catalyst dose of 0.1 g/L and a reaction time of 16h at 3000 lux, the MC-LR (0.1 μg/mL) was completely removed (100% degraded) and the treated water complied with algal toxin limits set by the WHO and China, which is proved to be the most effective MC-LR degradation craft. |
| 彭晓叶,汤嘉雯,杨钧岩,孙巍峰,王旭娜,江敏.2018.硫掺杂二氧化钛的光催化活性及其对微囊藻毒素的降解[J].水生态学杂志,39(5):95-103. |
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