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材料工程  2015 

pH值对乙二醇溶胶-凝胶法制备BiVO4光催化性能的影响

DOI: 10.11868/j.issn.1001-4381.2015.09.002, PP. 6-11

Keywords: 钒酸铋,乙二醇,光催化,甲基橙,溶胶-凝胶

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Abstract:

采用乙二醇溶胶-凝胶法制备了BiVO4样品,研究了不同反应pH值对样品的形貌及光催化活性的影响。通过SEM,XRD,XPS和UV-Vis等表征手段对样品的形貌、物相以及光学性能进行表征和分析。结果表明所制备的样品纯度较高,均为单斜型BiVO4光催化剂,并且随着反应pH值的改变,样品的形貌及光学性能也随之改变;当pH值为5时,产物为不规则的片状结构;当pH值增至7和9时,产物片状结构大量减少,表现出明显的颗粒状结构;当反应pH值增至11和13时,产物颗粒状结构团聚明显。当pH值为9时,所制备的样品具有最小的禁带宽度以及最小的晶体粒径,并且表现出最高的光催化活性,在250W金属卤化物灯下光照50min,对甲基橙的脱色率可达66.23%。

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