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无需添加任何模板剂,以Bi(NO3)·5H2O和NH4VO3为原料,采用柠檬酸络合法结合热处理的方法成功合成了BiVO4空心纳米球.采用TEM、XRD、TG-DTA、UV-Vis等测试手段对样品的形貌、相结构、光吸收性能进行了表征,以亚甲基蓝染料溶液的脱色降解实验为模型反应考察了样品的光催化性能.结果表明,所制备的BiVO4以单斜晶系白钨矿相存在且具有良好的中空结构,空心球平均粒径为160 nm,空腔直径为10～80 nm.UV-Vis谱图数据表明所制备的BiVO4样品的禁带宽度约为2.26 eV,样品在紫外区和可见区均有较强的光吸收.可见光照射下,亚甲基蓝溶液经BiVO4空心球脱色处理150 min后,脱色率可达到95%以上,COD去除率为73.66%.另外,考察了柠檬酸与铋离子不同摩尔比对空心球形貌的影响,并对BiVO空心纳米球的形成机理进行了探讨.
BiVO4 hollow nanospheres were successfully synthesized by the citrate complexation method and heat treatment without adding any template agent.Bi (NO3) · 5H2O and NH4VO3 were used as raw materials.The results of TEM, XRD, TG-DTA, UV-Vis and other tests The morphology, phase structure and optical absorption properties of the sample were characterized by means of decoloration and degradation experiments with methylene blue dye as the model reaction.The photocatalytic properties of the sample were investigated.The results show that the prepared BiVO4 monoclinic system of white tungsten The average diameter of the hollow sphere is 160 nm and the cavity diameter is 10 ~ 80 nm. The UV-Vis spectrum data show that the band gap of the prepared BiVO4 sample is about 2.26 eV, and the sample In the UV and visible region, there was strong light absorption.Under visible light irradiation, the methylene blue solution was discolored by BiVO4 hollow spheres for 150 min, the decolorization rate could reach more than 95% and COD removal rate was 73.66% .In addition, The influence of the molar ratio of acid to bismuth ion on the morphology of hollow spheres was investigated. The formation mechanism of BiVO hollow spheres was also discussed.