Fe-V共掺杂TiO_2高性能吸附剂的制备与表征

通过溶胶凝胶法、水热法和共沉淀法,分别以钛酸丁酯、异丙醇钛、硫酸钛、四氯化钛为钛源合成了一系列Fe-V共掺杂的纳米TiO_2吸附剂,研究了钛源、制备方法及煅烧温度对吸附剂吸附效果的影响,并采用XRD,SEM,EDX,TG-DTA,FTIR等手段分析了吸附剂的结构。实验结果表明,Fe-V共掺杂明显提高了TiO_2的吸附活性,其中以四氯化钛为钛源、通过共沉淀法制备、350℃焙烧处理的Fe-V共掺杂TiO_2具有最佳的吸附活性,30 min内对质量分数1.0×10~(-5)亚甲基蓝的脱色率可达97%以上;该吸附剂循环使用8次仍具有较高的吸附性能,且四氯化钛为较廉价的钛源,因此该高效吸附剂具有良好的工业应用前景。

Preparation and Characterization of Fe-V Codoped TiO2 Adsorbent with High Adsorbility

Fe-V codoped TiO₂ was prepared by sol-gel method,hydrothermal method and coprecipitation method separately,with tetrabutyl titanate,titanium isopropoxide,Ti（SO₄）₂ and titanium tetrachloride as titannium sources.The effects of preparation method,titanium source and calcinating temperature on the adsorbilities of the prepared Fe-V codoped TiO₂ adsorbents were investigated.The adsorbents were characterized by means of XRD,SEM,EDX,TG-DTA and FTIR.The results showed that the Fe-V mixture could remarkably improve the adsorption activity of TiO₂.The adsorptive activity of Fe-V codoped TiO₂ prepared by coprecipitation method was the highest in the decolourization of methylene blue solution.Under the optimal preparation conditions of titanium tetrachloride as titannium source and calcining temperature 350℃,decolourizing rate for methylene blue solution(mass fraction 1.0×10^-5) was more than 97%in 30 min.The adsorptive activity of the adsorbent was still high after being reused 8 times.