聚邻苯二胺修饰AgCl/g-C<sub>3</sub>N<sub>4</sub>纳米片复合光催化剂的制备及性能

引用本文: 孙林林, 刘重阳, 李金择, 周亚举, 王会琴, 霍鹏伟, 马长畅, 闫永胜. 聚邻苯二胺修饰AgCl/g-C₃N₄纳米片复合光催化剂的制备及性能[J]. 催化学报, 2019, 40(1): 80-94. doi: 10.1016/S1872-2067(18)63172-9 shu

Citation: Linlin Sun, Chongyang Liu, Jinze Li, Yaju Zhou, Huiqin Wang, Pengwei Huo, Changchang Ma, Yongsheng Yan. Fast electron transfer and enhanced visible light photocatalytic activity by using poly-o-phenylenediamine modified AgCl/g-C₃N₄ nanosheets[J]. Chinese Journal of Catalysis, 2019, 40(1): 80-94. doi: 10.1016/S1872-2067(18)63172-9 shu

聚邻苯二胺修饰AgCl/g-C₃N₄纳米片复合光催化剂的制备及性能

a 江苏大学化学化工学院绿色化学与化工技术研究院, 江苏镇江 212013;
b 江苏大学能源与动力工程学院, 江苏镇江 212013
基金项目:
国家自然科学基金（21576125，21776117）；中国博士后科学基金（2017M611716，2017M611734）；江苏省六大人才高峰项目（XCL-014）；镇江科技计划（SH2016012）.

摘要: 近年来，工业社会的发展为人们的日常生活带来了便利，然而也引起了环境污染问题.尤其是抗生素的滥用，不仅会导致各种慢性疾病和微生物的传播，而且会使微生物对抗生素产生抵抗力.因此，寻找一种有效且环保的方法来解决抗生素残留问题至关重要.光催化技术作为一种"绿色"技术，具有充分利用太阳光、降低能耗和完全矿化有机物的突出优点，已被广泛应用于消除环境污染.
光敏半导体材料AgCl具有良好的光响应范围、无毒、易制备等优点，成为光催化降解污染物过程中促进光催化剂活性的理想材料.然而，制备的AgCl纳米颗粒易于团聚并发生光腐蚀.目前，片状g-C₃N₄具有比表面积大和适当的带隙等优点.因此，构筑AgCl/g-C₃N₄异质结复合光催化剂不仅可以降低光生电子和空穴的复合速率，加快电子传输，还可以解决AgCl纳米颗粒易于团聚的问题.此外，聚邻苯二胺（PoPD）作为一种导电聚合物，具有高效的电子传输能力，用其包裹AgCl可以防止光腐蚀现象的发生.
本文采用沉淀法和光引发聚合法合成了新型高效的PoPD/AgCl/g-C₃N₄复合材料，并以20mg/L四环素作为目标污染物测试其可见光下的催化性能.用X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电镜（SEM）和比表面积（BET）测定等方法表征分析了催化剂的结构特征、微观形貌和光学性能.XRD分析发现，PoPD未影响AgCl/g-C₃N₄催化剂的晶型结构.XPS结果表明，复合材料由C，N，Ag，O，Cl元素组成，并能得到它们的元素价态.由SEM照片可看到不规则薄片状g-C₃N₄表面均匀地负载着被PoPD包裹的AgCl颗粒.根据BET测试结果，片状的g-C₃N₄比表面积比块状的增大4倍，使目标污染物能与光催化剂表面活性物质充分接触反应.光催化性能测试结果进一步表明，PoPD/AgCl-35/g-C₃N₄在可见光下具有优异的光催化性能：可见光照射120min内，四环素的降解效率可达83.06%，降解速率常数是纯g-C₃N₄的7.98倍.循环实验表明，经过四次循环后催化剂仍具有优异的光催化降解性能，说明所合成的催化剂具有良好的稳定性.
用抗坏血酸、乙二胺四乙酸和异丙醇捕获剂进行了自由基捕获实验，进一步研究PoPD/AgCl/g-C₃N₄催化剂的光催化机理.结果表明，超氧自由基和空穴在降解四环素过程中起主要作用，羟基自由基的作用相对较小.通过价带谱测试和带隙计算出材料的价导带位置，并对可能的机理进行了相应的分析.总之，PoPD/AgCl/g-C₃N₄光催化剂具有良好的稳定性和优异的光催化性能，为制备高稳定性复合光催化剂提供了一种新技术.

关键词:

English

Fast electron transfer and enhanced visible light photocatalytic activity by using poly-o-phenylenediamine modified AgCl/g-C₃N₄ nanosheets

a Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
b School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
Received Date: 25 July 2018
Revised Date: 18 September 2018
Fund Project:
This work was supported by the National Natural Science Foundation of China (21576125, 21776117), the China Postdoctoral Science Foundation (2017M611716, 2017M611734), the Six talent peaks project of Jiangsu Province (XCL-014), and the Zhenjiang Science & Technology Program (SH2016012).

Abstract: Exfoliation of bulk graphitic carbon nitride (g-C₃N₄) into two-dimensional (2D) nanosheets is one of the effective strategies to improve its photocatalytic properties so that the 2D g-C₃N₄ nanosheets (CN) have larger specific surface areas and more reaction sites. In addition, poly-o-phenylenediamine (PoPD) can improve the electrical conductivity and photocatalytic activity of semiconductor materials. Here, the novel efficient composite PoPD/AgCl/g-C₃N₄ nanosheets was first synthesized by a precipitation reaction and the photoinitiated polymerization approach. The obtained photocatalysts have larger specific surface areas and could achieve better visible-light response. However, silver chloride (AgCl) is susceptible to agglomeration and photocorrosion. The PoPD/AgCl/CN composite exhibits an extremely high photocurrent density, which is three times that of CN. Obviously enhanced photocatalytic activities of PoPD/AgCl/g-C₃N₄ are revealed through the photodegradation of tetracycline. The stability of PoPD/AgCl/CN is demonstrated based on four cycles of experiments that reveal that the degradation rate only decreases slightly. Furthermore,·O₂^- and h⁺ are the main active species, which are confirmed through a trapping experiment and ESR spin-trap technique. Therefore, the prepared PoPD/AgCl/CN can be considered as a stable photocatalyst, in which PoPD is added as a charge carrier and acts a photosensitive protective layer on the surface of the AgCl particles. This provides a new technology for preparing highly stable composite photocatalysts that can effectively deal with environmental issues.

Key words:

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

聚邻苯二胺修饰AgCl/g-C₃N₄纳米片复合光催化剂的制备及性能

English

Fast electron transfer and enhanced visible light photocatalytic activity by using poly-o-phenylenediamine modified AgCl/g-C₃N₄ nanosheets

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

聚邻苯二胺修饰AgCl/g-C3N4纳米片复合光催化剂的制备及性能

English

Fast electron transfer and enhanced visible light photocatalytic activity by using poly-o-phenylenediamine modified AgCl/g-C3N4 nanosheets

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

聚邻苯二胺修饰AgCl/g-C₃N₄纳米片复合光催化剂的制备及性能

Fast electron transfer and enhanced visible light photocatalytic activity by using poly-o-phenylenediamine modified AgCl/g-C₃N₄ nanosheets

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs