研究报告
师倩莹,张静,郭雨菲,龚浩,张卫珂.复合催化剂氧化锡/网状碳的制备及光催化降解罗丹明B的研究[J].环境科学学报,2022,42(4):99-112
复合催化剂氧化锡/网状碳的制备及光催化降解罗丹明B的研究
- Photocatalytic degradation of rhodamine B by SnO2/reticulated carbon composite
- 基金项目：
- 作者
- 单位
- 师倩莹
- 太原理工大学环境科学与工程学院，太原 030024
- 张静
- 太原理工大学环境科学与工程学院，太原 030024
- 郭雨菲
- 太原理工大学环境科学与工程学院，太原 030024
- 龚浩
- 太原理工大学环境科学与工程学院，太原 030024
- 张卫珂
- 太原理工大学环境科学与工程学院，太原 030024
- 摘要：模板法与水热合成法制备了氧化锡/网状碳（SnO2/RCs）复合材料，以改善纯相氧化锡（SnO2）对印染废水的光催化处理效果.采用多种表征手段对所制备复合材料的微观结构、微观形貌、孔径分布和比表面积、光吸收性能、官能团以及光电性能进行了分析.通过可见光催化降解10 mg·L-1的罗丹明B溶液的实验评估了所制备材料的光催化性能和循环稳定性.结果表明，在可见光条件下，SnO2/RCs 复合材料的光催化性能与纯SnO2相比有显著提升，并且具有良好的循环稳定性.自由基捕获实验表明复合材料在降解有机污染物的过程中起作用的主要活性基团为空穴，超氧自由基和羟基自由基.复合材料光催化性能提高的原因归纳为：①能带结构改善所引起的对可见光的吸收性能的提高；②高的比表面积为光催化降解反应提供了更多的活性位点；③氧化锡与网状多孔碳所形成的异质结，使得电子传输/迁移能力提高，抑制了光生电子-空穴对的复合.
- Abstract：Tin oxide/reticulated carbon （SnO2/RCs） composites were synthesized through template method and hydrothermal method in order to improve the photocatalytic performance of pure tin oxide （SnO2） in dyeing wastewater treatment. The micro structure， morphology， pore size distribution and specific surface area， light absorption properties， functional groups and photoelectric properties were analyzed by the corresponding characterization methods.The photocatalytic performance and cycle stability of as synthesized materials were evaluated through 10 mg·L-1 rhodamine B degrading test under visible lights. The results showed that， the photocatalytic performance and cycle stability of SnO2/RCs composites were significantly improved compared to pure SnO2 under visible lights. Free radical trapping experiments showed that the main active groups of as synthesized composite are holes， superoxide and hydroxyl radicals during the organic pollutants degrading process. The main reasons of the composites photocatalytic performance improving can be summarized as， ① the improvement of the energy band structure caused to the absorption increasing of visible light， ② the high specific surface areas provided more active sites for photocatalytic degradation reaction，③ the heterojunction formed between tin oxide and the network porous carbon improved the electron transport/migration ability and inhibited the recombination of photogenerated electron-hole pairs.
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