回流法制备钒酸铟及其复合二氧化钛可见光催化性能

SYNTHESIS OF INDIUM VANADATE BY THE REFLUX METHOD AND ITS VISIBLE LIGHT PHOTOCATALYTIC ACTIVITY COUPLED WITH TITANIUM DIOXIDE

以氯化铟(InCl_3)和钒酸铵(NH_4VO_3)为原料,通过回流法制备出了钒酸铟(InVO_4)溶胶。用X射线衍射仪、透射电镜、分光光度计等手段对样品物相、微观形貌、光催化性能进行表征。结合实验结果分析了InVO_4的生成机理,优化了工艺参数。实验证明:回流法中用氢氧化钾(KOH)作矿化剂、回流温度为100℃,时间为20h时,可得到性能较好的InVO_4前驱体溶胶。最后,将制得的InVO_4溶胶与实验室自制的回流二氧化钛(TiO_2)溶胶混合获得复合溶胶。用溶胶-浸渍法在玻璃基片上制备复合薄膜,在一定温度下热处理,制得InVO_4-TiO_2复合光催化薄膜。通过测试,样品在可见光下12h对甲基橙的分解率最高可达73.1%。

Indium vanadate （InVO4） sol was successfully synthesized via the reflux method using InCl3 and NH4VO3 as raw materials The phase structure, morphology and photocatalytic activity of the samples were characterized by X-ray diffraction, transmission electron microscope and spectral photometry. The formation mechanism of InVO4 was analyzed and the optimized process parameters were ascertained according to the experimental results. The InVO4 precursor sol with good properties was obtained using KOH as mineralizer with the temperature of 100 ℃ and the time of 20 h respectively in the reflux method. The InVO4 precursor sol was doped in titania refluxed sol and the lnVO4-TiO2 composite thin films were prepared on glass substrate via the sol-gel dip coating method. The photocatalytic activity of the samples was characterized through the degradation of methyl orange under visible light. The highest degradation ratio of methyl orange could reach 73.1% after 12 h under visible light.