| Ag/g-C3N4可见光催化降解磺胺甲恶唑的性能及机理 |
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| 引用本文： | 宋亚丽, 田家宇, 齐晶瑶, 高珊珊, 崔福义. Ag/g-C3N4可见光催化降解磺胺甲恶唑的性能及机理[J]. 环境工程学报, 2018, 12(11): 3079-3089. doi: 10.12030/j.cjee.201803220 |
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| 作者姓名： | 宋亚丽 田家宇 齐晶瑶 高珊珊 崔福义 |
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| 作者单位： | 1.郑州轻工业学院材料与化学工程学院，环境污染治理与生态修复河南省协同创新中心，郑州 450001; 2.哈尔滨工业大学城市水资源与水环境国家重点实验室，哈尔滨150090; 3.河北工业大学土木与交通学院，天津300401; 4.重庆大学城市建设与环境工程学院，重庆400044 |
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| 基金项目： | 国家自然科学基金资助项目（51779065） |
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| 摘 要： | 采用光还原方法成功地制备出了Ag/g-C3N4复合光催化剂，并考察了Ag/g-C3N4光催化剂在可见光下降解磺胺甲恶唑的效能、机理及各反应体系中间产物的生成情况，系统性地探究Ag/g-C3N4可见光降解磺胺甲恶唑的过程。实验结果表明，在g-C3N4中引入Ag纳米颗粒可以提高磺胺甲恶唑的降解效率。经可见光照射60 min后，Ag/g-C3N4-1、Ag/g-C3N4-3、Ag/g-C3N4-5、Ag/g-C3N4-8、Ag/g-C3N4-10降解磺胺甲恶唑的一级动力学常数比g-C3N4分别提高了1.29、1.76、3.41、4.82和7.12倍。这说明在可见光下，Ag/g-C3N4更适合于磺胺甲恶唑的高效降解。在Ag/g-C3N4可见光下降解磺胺甲恶唑的过程中，光生空穴和O2-·是主要活性物种，TP98、TP269和TP283是降解过程中的主要中间产物。其中，TP98主要由O2-·作用生成，TP269由·OH作用产生，而TP283受光生空穴的影响比较大。
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| 关 键 词： | Ag/g-C3N4光催化剂 可见光催化 磺胺甲恶唑 光催化机理 |
Performance and mechanism of visible-light photodegradation of sulfamethoxazole by Ag/g-C3N4 |
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| SONG Yali, TIAN Jiayu, QI Jingyao, GAO Shanshan, CUI Fuyi. Performance and mechanism of visible-light photodegradation of sulfamethoxazole by Ag/g-C3N4[J]. Chinese Journal of Environmental Engineering, 2018, 12(11): 3079-3089. doi: 10.12030/j.cjee.201803220 |
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| Authors: | SONG Yali TIAN Jiayu QI Jingyao GAO Shanshan CUI Fuyi |
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| Affiliation: | 1.Henan Collaborative Innovation Centre of Environmental Pollution Control and Ecological Restoration，School of Material and Chemical Engineering，Zhengzhou University of Light Industry，Zhengzhou 450001, China; 2.State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; 3.School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China; 4.College of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400044, China |
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| Abstract: | Ag/g-C3N4 photocatalysts were successfully synthesized by a photo-reduced method. The photodegradation efficiency, mechanism and intermediate products of sulfamethoxazole (SMX) by Ag/g-C3N4 photocatalysts under visible light irradiation were studied in order to systematically investigate the corresponding process. The results revealed that Ag deposition on the g-C3N4 sheet could enhance the photocatalytic activity on SMX degradation. After 60 min visible light irradiation, the pseudo-first-order kinetic rate constants of SMX photodegradation by Ag/g-C3N4-1, Ag/g-C3N4-3, Ag/g-C3N4-5, Ag/g-C3N4-8 and Ag/g-C3N4-10 increased by 1.29, 1.76, 3.41, 4.82 and 7.12 times compared to pure g-C3N4, respectively, which indicated that Ag/g-C3N4 was more suitable for the visible-light-induced degradation of SMX. During the photodegradation process, photogenerated holes and O2-· were the main active species, and TP98, TP269 and TP283 were the main intermediates. Among these three intermediates, TP98 formation was mainly attributed to the O2--related process, TP269 was mainly affected by ·OH, and TP 283 was produced by the photogenerated hole-induced process. |
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| Keywords: | Ag g-C3N4 photocatalysts visible-light photocatalysis sulfamethoxazole photocatalytic mechanism |
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