Three-dimensional Ag2O/Bi5O7I p-n heterojunction photocatalyst harnessing UV-vis-NIR broad spectrum for photodegradation of organic pollutants
Three-dimensional Ag2O/Bi5O7I p-n heterojunction photocatalyst harnessing UV-vis-NIR broad spectrum for photodegradation of organic pollutants
复制标题
三维Ag2O/Bi5O7I p-n异质结光催化剂利用紫外-可见-近红外广谱光降解有机污染物
DOI：
10.1016/j.jhazmat.2017.10.015
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发表时间：
2018-02-15
影响因子：
13.6
通讯作者：
Liu, Peng
中科院分区：
文献类型：
--
作者：
Chen, Yannan;Zhu, Gangqiang;Liu, Peng
本研究合成了纳米Ag2O负载的Bi(5)O7I微球，形成了具有广谱响应的三维Ag2O/Bi5 O7Ip-n异质结光催化剂。透射电子显微镜观察结果表明，在Bi5O7I纳米片表面分布着直径约为10-20 nm的Ag2O纳米粒子。合成的Ag2O Bi5O7I在紫外光(UV)和近红外(NIR)波段都表现出了良好的广谱响应，表明其具有有效利用太阳能的潜力。与纯Bi5O7I相比，Ag2O/Bi5O7I复合材料在可见光LED照射下对水溶液中双酚A和苯酚的降解也表现出了良好的光催化活性。其中，20%Ag2O/Bi5O7I复合光催化剂对水溶液中双酚A和苯酚的光催化活性最高。此外，20%Ag2O/B5O7I复合材料在近红外光照射下也表现出对双酚A的光催化活性。光催化活性的提高归因于在Ag2O和Bi5O71之间形成了p-n异质结，允许有效地利用太阳能(从UV到NIR)和光生电子-空穴对的高分离效率。目前的工作是为了探索一条充分利用太阳能的可能途径。(C)2017爱思唯尔B.V.保留所有权利。
Ag2O nanoparticles-loaded Bi(5)O7I microspheres forming a three dimensional Ag2O/Bi(5)O7I p-n hetero-junction photocatalyst with wide-spectrum response were synthesized in this study. The results of transmission electron microscopy observations revealed that the Ag2O anoparticles with the diameter of ca. 10-20nm were distributed on the surfaces of Bi5O7I nanosheets. The as-synthesized Ag2O Bi5O7I exhibited an excellent wide -spectrum response to wavelengths ranging from ultraviolet (UV) to near infrared (NIR), indicating its potential for effective utilization of solar energy. Compared with pure Bi5O7I, the Ag2O/Bi5O7I composite also demonstrated excellent photocatalytic activity for the degradation of Bisphenol A and phenol in aqueous solution under visible LED light irradiation. Among samples, the 20% Ag2O/Bi5O7I composite photocatalyst showed the highest photocatalytic activity for the degradation of Bisphenol A and phenol in aqueous solution. In addition, the 20% Ag2O/B5O7I composite also exhibited a photocatalytic activity for the degradation of Bisphenol A under NIR light irradiation. The improved photocatalytic activity is attributed to the formation of a p-n heterojunction between Ag2O and Bi5O7I.allowing the efficient utilization of solar energy (from UV to NIR) and high separation efficiency of photogenerated electron-hole pairs. The present work is desirable to explore a possible avenue for the full utilization of solar energy. (C) 2017 Elsevier B.V. All rights reserved.