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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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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
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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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
Citation: 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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Ag/g-C3N4可见光催化降解磺胺甲恶唑的性能及机理

  • 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

  • 基金项目:

    国家自然科学基金资助项目（51779065）

Performance and mechanism of visible-light photodegradation of sulfamethoxazole by Ag/g-C3N4

  • 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

  • Fund Project:

  • 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。
    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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  • 刊出日期:  2018-11-12

Ag/g-C3N4可见光催化降解磺胺甲恶唑的性能及机理

  • 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
基金项目:

国家自然科学基金资助项目（51779065）

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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