固相研磨法制备AgI/Ag3PO4复合光催化剂及其光催化性能

doi:10.16085/j.issn.1000-6613.2018-0342

化工进展 ›› 2019, Vol. 38 ›› Issue (02): 892-898.DOI: 10.16085/j.issn.1000-6613.2018-0342

固相研磨法制备AgI/Ag₃PO₄复合光催化剂及其光催化性能

张晓君(),李佳乐,刘一儒,张凌云,于大禹()

东北电力大学吉林省生物质清洁转化与高值化利用科技创新中心，吉林吉林 132012

收稿日期:2018-02-08 修回日期:2018-05-16 出版日期:2019-02-05 发布日期:2019-02-05
通讯作者: 于大禹
作者简介:<named-content content-type="corresp-name">张晓君</named-content>（1974—），女，实验师，博士，研究方向为光催化材料。E-mail：<email>zhangxjun1123@126.com</email>。|于大禹，教授，博士生导师，研究方向为功能材料。E-mail：<email>yudy@neepu.edu.cn</email>。
基金资助:
国家自然科学基金(31470787);吉林省“十三五”科技发展计划(20170519015JH);吉林省教育厅“十三五”科学研究规划项目(JJKH20170096KJ)

Synthesis of AgI/Ag₃PO₄ composite photocatalysts using solid state grinding method and their photocatalytic activities

Xiaojun ZHANG(),Jiale LI,Yiru LIU,Lingyun ZHANG,Dayu YU()

Sci-Tech Center for Clean Conversion and High-valued Utilization of Biomass, Northeast Electric Power University, Jilin 132012, Jilin, China

Received:2018-02-08 Revised:2018-05-16 Online:2019-02-05 Published:2019-02-05
Contact: Dayu YU

摘要/Abstract

摘要：

采用固相研磨法，以Ag₃PO₄和KI为原料在研钵中研磨，机械化学效应作用下发生固相反应，在Ag₃PO₄表面包覆生成了AgI纳米粒子。改变研磨时间和反应物中KI的摩尔分数能够调控AgI/Ag₃PO₄复合光催化剂的组成和形貌。AgI/Ag₃PO₄复合光催化剂显示较强的可见光吸收性质，其光催化活性显著高于Ag₃PO₄或AgI。反应物中KI摩尔分数为10%，研磨时间为10min时制备得到的样品显示出最高的光催化活性，可见光照射1h，罗丹明B降解率达到99%，并具有较好的稳定性和循环利用效果。AgI壳层可以避免磷酸银的光腐蚀，提高了磷酸银在水中的结构稳定性。AgI的导带和价带位置比Ag₃PO₄更负，因此AgI的光生电子容易迁移到Ag₃PO₄表面，同时Ag₃PO₄产生的光生空穴可以迁移到AgI的价带上，降低了光生电子和空穴的复合，提高了光催化效率。

关键词: 催化, 复合材料, 合成, 研磨法, 碘化银, 磷酸银

Abstract:

The composite photocatalysts Ag₃PO₄ coated with AgI were prepared via solid state grinding method. Through being grinded in a mortar, Ag₃PO₄ reacted with KI under the mechanochemical effect. The AgI nanoparticles, which were obtained by the solid-state reaction, was coated on the surface of the Ag₃PO₄ particles. The compositions and morphologies of the AgI/Ag₃PO₄ composite photocatalysts could be controlled by adjusting the KI content and the grinding time. The AgI/Ag₃PO₄ composite photocatalysts exhibited strong absorption to the visible light, and much higher photocatalytic activity than that of single Ag₃PO₄ or AgI. As a result, the as-prepared photocatalysts exhibited the highest photocatalytic activity, when the KI content of 10% and the grinding time of 10 minute was adopted. The degradation efficiency of Rhodamine B could reach 99% under visible light irradiation for 1h. The AgI/Ag₃PO₄ composite photocatalysts had excellent stability and recyclability. The AgI shells avoided the photocorrosion and improved the structural stability of Ag₃PO₄ in water. The valence band and conduction band potentials of AgI were both more negative than that of Ag₃PO₄. Therefore, the photoinduced electrons of AgI could be transferred to the surface of Ag₃PO₄, and the photogenerated holes of Ag₃PO₄ could migrate to the valence band of AgI. So, the probability of the electron-hole recombination was decreased, and the photocatalytic activity was enhanced.

Key words: catalyst, composites, synthesis, grinding method, silver iodide, silver phosphate

中图分类号:

O643

张晓君, 李佳乐, 刘一儒, 张凌云, 于大禹. 固相研磨法制备AgI/Ag₃PO₄复合光催化剂及其光催化性能[J]. 化工进展, 2019, 38(02): 892-898.

Xiaojun ZHANG, Jiale LI, Yiru LIU, Lingyun ZHANG, Dayu YU. Synthesis of AgI/Ag₃PO₄ composite photocatalysts using solid state grinding method and their photocatalytic activities[J]. Chemical Industry and Engineering Progress, 2019, 38(02): 892-898.

图/表 9

图1 Ag3PO4和不同研磨时间制备的AgI/Ag3PO4复合光催化剂的SEM图

图2 Ag3PO4和反应物中不同摩尔分数KI制备的AgI/Ag3PO4复合光催化剂的SEM图

图3 Ag3PO4和不同研磨时间制备的AgI/Ag3PO4复合光催化剂的XRD图

图4 反应物中不同摩尔分数KI制备的AgI/Ag3PO4复合光催化剂的XRD图

图5 Ag3PO4和AgI/Ag3PO4复合光催化剂的EDS谱图

图6 样品的紫外可见漫反射光谱图

图7 样品对罗丹明B的光催化降解曲线

图8 AgI/Ag3PO4复合光催化剂循环降解罗丹明B

图9 AgI/Ag3PO4复合光催化剂提高光催化效率的机理示意图

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固相研磨法制备AgI/Ag₃PO₄复合光催化剂及其光催化性能

Synthesis of AgI/Ag₃PO₄ composite photocatalysts using solid state grinding method and their photocatalytic activities

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