一种具有增强可见光光催化性能的 BiOCl/Bi2Sn2O7 异质结光催化剂的新型合成方法。

A novel method for the synthesis of BiOCl/Bi2Sn2O7 heterojunction photocatalysts with enhanced visible light photocatalytic properties.

机构信息

School of Materials Science and Engineering, Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, Liaocheng University, Liaocheng, Shandong 252000, People's Republic of China.

出版信息

Nanotechnology. 2016 Sep 23;27(38):385602. doi: 10.1088/0957-4484/27/38/385602. Epub 2016 Aug 12.

DOI:10.1088/0957-4484/27/38/385602

PMID:27518499

Abstract

A novel simple method was proposed to synthesize BiOCl/Bi2Sn2O7 heterojunction photocatalysts through the treatment of Bi2Sn2O7 with HCl solution of different concentrations. The as-synthesized photocatalysts were characterized by x-ray diffraction, scanning electron microscopy, transmission electron microscopy, photoluminescence, x-ray photoelectron spectroscopy and ultraviolet-visible diffuse reflectance spectroscopy. The experimental results show that sheet-like BiOCl particles were obtained after the HCl treatment. Bi2Sn2O7 nanoparticles were distributed on the BiOCl sheets, resulting in the low aggregation of the Bi2Sn2O7 nanoparticles. As compared to BiOCl and Bi2Sn2O7, BiOCl/Bi2Sn2O7 showed enhanced photocatalytic activity under visible light irradiation, which can be attributed to the effective separation of photogenerated electrons and holes due to the formation of a BiOCl/Bi2Sn2O7 heterojunction. In addition, the dominant active species and the photocatalytic mechanism were discussed in detail.

摘要

提出了一种通过用不同浓度的 HCl 溶液处理 Bi2Sn2O7 来合成 BiOCl/Bi2Sn2O7 异质结光催化剂的简单新方法。通过 X 射线衍射、扫描电子显微镜、透射电子显微镜、光致发光、X 射线光电子能谱和紫外-可见漫反射光谱对合成的光催化剂进行了表征。实验结果表明，HCl 处理后得到了片状 BiOCl 颗粒。Bi2Sn2O7 纳米颗粒分布在 BiOCl 片上，导致 Bi2Sn2O7 纳米颗粒的聚集程度较低。与 BiOCl 和 Bi2Sn2O7 相比，BiOCl/Bi2Sn2O7 在可见光照射下表现出增强的光催化活性，这归因于形成 BiOCl/Bi2Sn2O7 异质结导致光生载流子的有效分离。此外，详细讨论了主要的活性物质和光催化机理。