BiOI/g-C3N4光催化降解甲基橙研究

以三聚氰胺为前驱物采用热聚合法制备了石墨相氮化碳（g-C₃N₄）,并在其表面原位合成了碘氧化铋（BiOI）,构筑了石墨相氮化碳-碘氧化铋复合材料。采用X射线衍射仪（XRD）、傅里叶变换红外光谱仪（FT-IR）、紫外可见漫反射仪（UV-Vis-DRS）等对催化剂进行了表征。结果表明,当BiOI与g-C₃N₄物质的量比为0.5时,BiOI/g-C₃N₄催化剂具有高分散的BiOI颗粒及适中的禁带宽度,吸附和降解甲基橙性能最佳。回流温度为120 ℃时制备的BiOI/g-C₃N₄催化剂具有适中的粒径、比表面积和表面羟基浓度,吸附和降解甲基橙性能最佳,且该催化剂具有良好的重复使用性能。

Study on photocatalytic degradation of methyl orange by BiOI/g-C3N4

Graphite phase carbon nitride(g-C₃N₄)was prepared by thermal polymerization using melamine as precursor.Then bismuth oxyiodide(BiOI)was in-situ generated on its surface to construct BiOI/g-C₃N₄composite.The catalyst was characterized by X-ray diffraction XRD,fourier transform infrared spectroscopy(FT-IR)and ultraviolet visible diffuse reflectance spectroscopy(UV-Vis-DRS).The results showed that when the mass-of-substance of BiOI to g-C₃N₄was 0.5,the catalyst of BiOI/g-C₃N₄had high dispersion of Bi OI particles and moderate band gap and the adsorption and degradation performance of methyl orange was the best.The catalyst of BiOI/g-C₃N₄prepared at reflux temperature of 120℃had moderate particle size,specific surface area and surface hydroxyl concentration and the best adsorption and degradation performance of methyl orange.In addition,the catalyst had good recyclability.