TiO_2微球光催化降解腐植酸钠

Photocatalytic degradation of sodium humate with TiO_2 microspheres

以阳离子交换树脂为模板,采用溶胶-凝胶法以四氯化钛为原料制备TiO2微球,采用XRD,FTIR,SEM对样品进行了表征。微球中主要组分是锐钛矿型TiO2,同时掺杂有少量Na+,SO24-等离子,比TiO2粉末具有更好的光催化性能,具备重复使用的能力,使用寿命较长,可作为一种有实用价值的光催化剂。在300 W高压汞灯下采用二氧化钛微球催化降解腐植酸钠,分析了催化剂投加量和反应时间对降解率的影响。腐植酸钠的光催化降解实验结果表明:初始浓度为10 mg/L的腐植酸钠在碱性条件,催化剂投加量为2.5 g/L,反应时间为3 h时最为适宜,最大降解率可达到96.51%。

The TiO2 microspheres using titanium tetrachloride as raw material and cation resins as tem- plates, were prepared by a sol-gel method and characterized by XRD, FTIR, SEM. TiO2 microspheres were mainly composed of anatase TiO2, while doped a small amount of Na ＋ , SO2- , which photocatalytic properties such as reuse and long service life were better than the TiO2 powders, and could be used as the practical value of the photocatalyst. Some influencing factors of degradation such as the addition of catalysis of TiO2 microspheres and reaction time were investigated under 300 W high-pressure mercury light. Photocatalytic degradation of sodi- um humate results showed that when the initial concentration of sodium humate was 10 mg/L under alkaline con- dition, the amount of catalyst was 2.5 g/L, and the best degradation rate can reach 96.51% after 3 h.