BiOI/TiO_(2)纳米棒阵列膜的制备及光催化性能

Preparation and photocatalytic properties of BiOI/TiO_(2) nanorod arrays film

为了探究碘氧化铋/二氧化钛纳米棒阵列膜的制备条件对抗生素降解效率的影响,利用水热法及连续离子层吸附反应法制备碘氧化铋/二氧化钛纳米棒阵列膜,通过SEM、XRD以及紫外可见漫反射测试等技术表征了制备的光催化膜微观结构及光响应范围,研究了光催化膜对抗生素的光催化降解性能,给出了最佳的合成条件。结果表明:TiO_(2)垂直生长在基底上,规则排列形成纳米棒阵列形貌;与BiOI复合后,BiOI以片状沉积在TiO_(2)纳米棒上,复合膜禁带宽度变窄,光响应范围得到了提高,TiO_(2)与BiOI之间形成异质结,光催化活性增强;BiOI/TNAs膜最佳制备条件为水热温度150℃,水热时间8 h,钛酸四丁酯、盐酸、水的体积比为1∶30∶30。BiOI沉积6次时,BiOI/TNAs膜的光催化活性最好,为TNAs膜的2倍。

The paper aims to explore the effect of preparation conditions of BiOI/TiO_(2) nanorod arrays film on the degradation efficiency of antibiotics.The study involves using hydrothermal method and the successive ionic layer adsorption and reactionprocedure to prepare BiOI/TiO_(2) nanorod arrays film,characterizing the microstructure and light response range of the prepared photocatalytic film by SEM,XRD and UV-Vis diffuse reflection test,showing the best ynthesis conditions,and studying the photocatalytic degradation performance of photocatalytic film on antibiotics.The results show that TiO_(2) is growing vertically on the substrate,which is regularly arranged to form the morphology of nanorod array;compounding with BiOI,BiOI is deposited on TiO_(2) nanorods as flakes,the band gap of the composite film is narrowed,the light response range is enlarged,a heterojunction is formed between TiO_(2) and BiOI,and the photocatalytic activity is enhanced;the optimum preparation conditions of BiOI/TNAs film are hydrothermal temperature of 150℃,hydrothermal time of 8 h,the volume ratio of tetrabutyl titanate,hydrochloric acid and water is 1∶30∶30,and the photocatalytic activity of BiOI/TNAs film performs best,as twice that of TNAs film,when BiOI is deposited 6 times.