| 引用本文: | 潘龙,延旭,毛艳丽,康海彦,宋忠贤,张霞,闫晓乐,罗宏宇,朱新锋,胡泊.Co3O4负载rGO/g-C3N4臭氧光催化降解2,4-二氯苯氧乙酸活性研究[J].材料科学与工艺,2022,30(6):71-81.DOI:10.11951/j.issn.1005-0299.20210322. |
| PAN Long,YAN Xu,MAO Yanli,KANG Haiyan,SONG Zhongxian,ZHANG Xia,YAN Xiaole,LUO Hongyu,ZHU Xinfeng,HU Bo.Photocatalytic ozonation of 2,4-dichlorophenoxyacetic acid by Co3O4 loaded rGO/g-C3N4[J].Materials Science and Technology,2022,30(6):71-81.DOI:10.11951/j.issn.1005-0299.20210322. |
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| Co3O4负载rGO/g-C3N4臭氧光催化降解2,4-二氯苯氧乙酸活性研究 |
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潘龙1,延旭1,毛艳丽1,康海彦1,宋忠贤1,张霞1,闫晓乐1,罗宏宇1,朱新锋1,胡泊2
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(1.河南城建学院 市政与环境工程学院,河南 平顶山 467000; 2.辽源市食品质量安全检测中心, 吉林 辽源 136200) [HJ1.1mm]
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| 摘要: |
| 通过简单的水热法制备了Co3O4/rGO/g-C3N4催化剂,并在可见光照射下用于光催化臭氧氧化降解2,4-二氯苯氧乙酸(2,4-D)。利用XRD, SEM, TEM, XPS, UV-vis DRS, FT-IR和瞬态光电流对样品进行测试表征。研究表明,Co3O4, rGO和g-C3N4形成异质结后光生电子-空穴(e--h+)对的分离效率,e-的迁移能力以及光催化臭氧氧化活性都明显提升。此外,0.5Co3O4/0.25rGO/GCN对2,4-D具有100%的去除率,并具有最高反应速率(k=0.070 9 min-1)。经过计算得出光催化臭氧氧化2,4-D的协同因子为3.91,表明光催化和臭氧氧化间具有较好的协同效应。活性组分的捕获实验结果表明h+和·OH是光催化臭氧氧化反应过程中的主要活性物种。此外,经过五次光催化臭氧氧化的循环实验,0.5Co3O4/0.25rGO/GCN样品表现处较好的稳定性,本文同时得出光催化臭氧氧化过程的反应机理。 |
| 关键词: 光催化 臭氧氧化 四氧化三钴 石墨烯/氮化碳 2,4-二氯苯氧乙酸 |
| DOI：10.11951/j.issn.1005-0299.20210322 |
| 分类号:O643 |
| 文献标识码:A |
| 基金项目:河南省高等学校重点科研项目(20A150009);河南省自然科学基金青年基金项目(202300410033, 202300410034);国家自然科学基金资助项目(U1904174);河南科技攻关项目(202102310280, 202102310287, 212102310068). |
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| Photocatalytic ozonation of 2,4-dichlorophenoxyacetic acid by Co3O4 loaded rGO/g-C3N4 |
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PAN Long1, YAN Xu1, MAO Yanli1, KANG Haiyan1, SONG Zhongxian1, ZHANG Xia1, YAN Xiaole1, LUO Hongyu1, ZHU Xinfeng1, HU Bo2
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(1. School of Municipal and Environment Engineering, Henan University of Urban Construction, Pingdingshan 467000, China; 2.Liaoyuan Food Quality and Safety Testing Center, Liaoyuan 136200, China)
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| Abstract: |
| In this work, Co3O4/rGO/g-C3N4 catalyst was fabricated by a simple hydrothermal method and employed for visible-light-driven photocatalytic ozonation process towards the degradation of 2,4-dicholorophenoxyacetic acid (2,4-D). The samples were characterized by XRD, SEM, TEM, XPS, UV-vis DRS, FT-IR,and transient photocurrent. Results show that the separation efficiency of photogenerated e--h+ pairs,mobility of e-transfer, and photocatalytic ozonation performance were obviously improved because of the formation of the heterojunction between Co3O4, rGO, and g-C3N4. Moreover, the removal efficiency for 2,4-D by 0.5Co3O4/0.25rGO/GCN was 100% with the highest reaction rate(k=0.070 9 min-1). The synergy index for photocatalytic ozonation of 2,4-D was calculated to be 3.91, indicating a superior synergistic effect between photocatalysis and ozonation. Results of radical scavenger experiments showed that the reactive species including h+ and ·OH played an important role in the photocatalytic ozonation process. In addition, 0.5Co3O4/0.25rGO/GCN samples showed good stability after five cyclesof photocatalytic ozonation process, and the reaction mechanism of photocatalytic ozonation process was obtained. |
| Key words: photocatalysis ozonation Co3O4 rGO/g-C3N4 2,4-dichlorophenoxyacetic acid |
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