| Bi2MoO6/Bi2S3异质结光催化降解四环素-铜复合物 |
| 摘要点击 1977 全文点击 720 投稿时间：2020-01-30 修订日期：2020-06-24 |
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| 中文关键词 光催化 四环素 铜离子 复合物 降解机制 |
| 英文关键词 photocatalytic tetracycline copper ion complex degradation mechanism |
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| 中文摘要 |
| 利用溶剂热法制备了Bi2MoO6/Bi2S3异质结材料，采用XRD、TEM、UV-Vis、XPS和光电流响应等表征手段对异质结材料的形貌结构、化学组成和光电性能进行了表征.利用所合成的Bi2MoO6/Bi2S3对四环素（TC）及四环素-铜（TC-Cu）复合物进行光催化降解.考察了溶液的初始pH，TC初始浓度及TC与Cu2+复合量比对TC降解效果的影响.通过自由基捕获实验及中间产物的鉴定探讨了Bi2MoO6/Bi2S3光催化降解TC和TC-Cu过程的主要活性自由基、中间产物及降解机制；并利用小球藻生长抑制率实验评估了光催化降解过程的毒性.结果表明所制备的Bi2MoO6/Bi2S3异质结是均匀的纳米片，带隙能为1.76 eV.Bi2MoO6与Bi2S3质量比为3：1（MS-0.3）异质结对TC浓度为10 mg·L-1和量比为2：1的TC与Cu2+的中性溶液表现出最强的光催化性能，反应60 min后，TC-Cu中TC的去除率和溶液的矿化率分别为85.63%和52.94%.活性基团捕获实验的结果表明，该异质结在可见光下主要的活性物种是·O2-.生长抑制率实验结果表明，Cu2+的存在降低了复合物中TC光催化降解产物的毒性，光催化氧化可以有效去除复合物中的抗生素. |
| 英文摘要 |
| Bi2MoO6/Bi2S3 heterojunctions were synthesized by the solvothermal method. The morphology, chemical composition, and photoelectric properties of the heterojunction materials were characterized by XRD, TEM, UV-Vis, XPS, and I-T. Tetracycline (TC) and tetracycline-copper (TC-Cu) composites were degraded by the as-prepared heterojunctions under visible light. The effects of pH, initial concentration of TC, and molar ratio of TC to Cu2+ on the degradation deficiency of TC were investigated. Additionally, the main active radicals, intermediates, and mechanisms were ascertained by in situ capture experiments and the identification of intermediates. The toxicities of TC and TC-Cu before and after degradation were evaluated by chlorella growth inhibition experiments. The results showed that the prepared Bi2MoO6/Bi2S3 heterojunction was a uniform nanosheet and its band gap was 1.76 eV. Bi2MoO6 and Bi2S3 with a mass ratio of 3:1 (MS-0.3) exhibited a composite ratio of TC and Cu2+ was 2:1 and had the best photocatalytic performance. When the concentration of TC was 10 mg·L-1 with neutral solutions, after reacting for 60 min, the degradation rate of TC and mineralization rate of the solution for TC-Cu were 85.63% and 52.94%, respectively. The results of active group capture experiments showed that the main active group of the heterojunction was the·O2- radical in visible light. In addition, the results of growth inhibition experiments showed that the presence of Cu2+ reduces the toxicity of TC photocatalytic degradation products in the TC-Cu complex, and the antibiotics can be effectively removed in the TC-Cu complex by photocatalytic oxidation. |
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