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AgVO3/BiVO4复合光催化剂的制备及可见光催化性能
作者: 宇1  敏1  鑫2 杨光俊1 柴天昱1  彤1 
单位:(1. 东北大学机械工程与自动化学院 沈阳 110819 2. 辽宁省污水处理管控中心 沈阳 110000) 
关键词:偏钒酸银/钒酸鉍复合材料 光催化剂 异质结 可见光 甲基橙 
分类号:O643
出版年,卷(期):页码:2019,47(1):0-0
DOI:10.14062/j.issn.0454-5648.2019.01.18
摘要:

 通过水热法制备了不同复合比例的AgVO3/BiVO4复合型光催化剂,以有机染料甲基橙作为目标降解物评价了其光催化活性,并通过X射线衍射、扫描电子显微镜、X射线能谱、X射线光电子能谱和紫外–可见漫反射光谱对其进行了表征。结果表明:制备的样品纯度很高,复合AgVO3后,BiVO4的晶体结构未发生改变,但形貌由石笼状变为分散的粒状混合体,光吸收性能增强,同时,二者形成了异质结结构,进一步促进了光生电子?空穴的分离,从而提高了光催化活性。当AgVO3与BiVO4的摩尔比为70%时,光催化活性最高且稳定性良好,光照50 min对甲基橙降解率高达96.7%,较纯BiVO4提高约86.5%,且该体系中的主要活性氧物质为空穴。

 AgVO3/BiVO4 composite photocatalysts were prepared by a hydrothermal method. The photocatalytic activities of the synthesized samples were evaluated by the degradation of methyl orange. And the samples were analyzed by X-ray diffraction, scanning electron microscopy, X-ray energy spectroscopy, X-ray photoelectron spectroscopy and UV-visible diffuse reflectance spectroscopy. The results exhibited that the AgVO3/BiVO4 samples were of good purity. After compounding AgVO3, the crystal structure of BiVO4 did not change, but the morphology changed from a stone cage to a single irregular stone, and had a enhanced light absorption performance. At the same time, the formation of a heterojunction structure further promoted the separation of photo electron-holes, then improving the photocatalytic activity. When the mass ratio of AgVO3/BiVO4 was 70%, the composite showed the highest photocatalytic activity, and the degradation rate of methyl orange was 96.7%, 86.5% higher than pure BiVO4. Recycling experiments presented that heterojunctions retained excellent photo-stability after five-time recycles. And the holes were the main active species in the process of photocatalytic degradation.

 
基金项目:
国家自然科学基金青年项目(21207093);辽宁省高等学校优秀人才支持计划(LJQ2014023)项目
作者简介:
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