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在超声波作用下,采用溶胶凝胶法以钛酸正丁酯为原料制备TiO2光催化剂,并进行了Fe3+掺杂使之在可见光下具有良好的光催化氧化活性,目标降解物为腐植酸(HA)。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、比表面积(BET)等进行表征,并研究了催化剂用量、超声反应时间、铁元素的掺杂量、焙烧烧温度、HA初始含量、pH、光反应时间等因素对HA的降解效果的影响。结果表明,在催化剂用量为2 g/L,超声反应时间为2 h,优化掺铁量n(Fe)/n(Ti)=1%,焙烧温度为350℃,HA初始浓度为10 mg/L,pH为9,光反应时间为3 h时,催化剂光催化降解HA效果最好,其在特定条件下对HA的降解率达到92.3%。
Under the action of ultrasonic wave, the TiO2 photocatalyst was prepared by sol-gel method using n-butyl titanate as raw material, and doped with Fe3 + to make it have good photocatalytic oxidation activity in visible light. The target degradation products were humic acid (HA ). The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and specific surface area (BET). The effects of catalyst dosage, ultrasonic reaction time, doping amount of iron, calcination temperature, initial HA content, pH , Light reaction time and other factors on the degradation of HA effect. The results showed that the optimized dosage of iron was n (Fe) / n (Ti) = 1%, the calcination temperature was 350 ℃ and the initial concentration of HA was 10 mg / L at 2 g / L of catalyst and 2 h of ultrasonic reaction. , pH 9, and light reaction time 3 h, the photocatalytic degradation of HA was the best, and the degradation rate of HA reached 92.3% under the specific conditions.