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通过协同效应合成具有增强光催化活性的银和氯化银共掺杂ZIF-8混合光催化剂。

Synthesis of Ag and AgCl co-doped ZIF-8 hybrid photocatalysts with enhanced photocatalytic activity through a synergistic effect.

作者信息

Jing Yanqiu, Lei Qiang, Xia Chun, Guan Yu, Yang Yide, He Jixian, Yang Yang, Zhang Yonghui, Yan Min

机构信息

College of Tobacco Science, Henan Agricultural University Zhengzhou Henan province China

Sichuan Provincial Branch of China National Tobacco Corporation Chengdu Sichuan province China.

出版信息

RSC Adv. 2020 Jan 2;10(2):698-704. doi: 10.1039/c9ra10100d.

DOI:10.1039/c9ra10100d
PMID:35494447
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9048217/
Abstract

Recently, Ag/AgCl composites with different structures have been widely studied and used as photocatalysts to degrade dye pollutants, due to their high separation efficiency of electron-hole pairs under visible light irradiation. Herein, we adopted a nucleation, precipitation, growth and photoreduction method to prepare Ag and AgCl co-doped ZIF-8 hybrid photocatalysts and explored the influence of Ag content on their physical and chemical properties. All as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) measurements, energy dispersive spectroscopy (EDS), UV-vis diffuse reflectance and X-ray photoelectron spectroscopy (XPS). XRD indicated that ZIF-8 and AgCl were formed and some of the AgCl was reduced into Ag after 30 min of UV light irradiation. SEM and TEM images verified that Ag/AgCl nanoparticles were inlaid in the body of ZIF-8 and Ag ions could hinder the growth of the ZIF-8 crystal. BET data indicated that Ag/AgCl nanoparticles did not alter the pore size of ZIF-8. The UV-vis diffuse reflectance spectra showed that Ag/AgCl@ZIF-8 has excellent ability to absorb visible light, indicating the high efficiency of the electron-hole pair separation of Ag/AgCl@ZIF-8. Finally, the photocatalytic activities of all of the as-synthesized samples were evaluated by degradation of RhB under visible light irradiation. Ag and AgCl co-doped ZIF-8 hybrid photocatalysts exhibited high photocatalytic activity due to the synergistic effect of ZIF-8, AgCl and Ag. After 60 min of visible light irradiation, Ag/AgCl(15)@ZIF-8 exhibited the best photocatalytic activity and could degrade 99.12% RhB, which was higher than Ag/AgCl (94.24%) and ZIF-8 (5.17%). Additionally, a photocatalytic mechanism for dye pollutant degradation over the Ag and AgCl co-doped ZIF-8 hybrid photocatalysts was proposed.

摘要

近年来，具有不同结构的Ag/AgCl复合材料因其在可见光照射下具有较高的电子-空穴对分离效率，而被广泛研究并用作光催化剂来降解染料污染物。在此，我们采用成核、沉淀、生长和光还原法制备了Ag和AgCl共掺杂的ZIF-8杂化光催化剂，并探究了Ag含量对其物理化学性质的影响。所有制备的样品均通过X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、布鲁诺尔-埃米特-泰勒（BET）测量、能量色散光谱（EDS）、紫外-可见漫反射和X射线光电子能谱（XPS）进行表征。XRD表明，在紫外光照射30分钟后，形成了ZIF-8和AgCl，且部分AgCl被还原为Ag。SEM和TEM图像证实，Ag/AgCl纳米颗粒镶嵌在ZIF-8主体中，Ag离子会阻碍ZIF-8晶体的生长。BET数据表明，Ag/AgCl纳米颗粒未改变ZIF-8的孔径。紫外-可见漫反射光谱表明，Ag/AgCl@ZIF-8具有优异的可见光吸收能力，表明Ag/AgCl@ZIF-8的电子-空穴对分离效率较高。最后，通过在可见光照射下降解罗丹明B（RhB）来评估所有合成样品的光催化活性。由于ZIF-8、AgCl和Ag的协同作用，Ag和AgCl共掺杂的ZIF-8杂化光催化剂表现出较高的光催化活性。在可见光照射60分钟后，Ag/AgCl(15)@ZIF-8表现出最佳的光催化活性，可降解99.12%的RhB，高于Ag/AgCl（94.24%）和ZIF-8（5.17%）。此外，还提出了Ag和AgCl共掺杂的ZIF-8杂化光催化剂降解染料污染物的光催化机理。

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