高岭土/纳米TiO_2复合光催化材料制备及性能研究  

Preparation and Properties of Kaolin /Nano-TiO_2 Composite Photocatalyst Material

作　　者：姜三营[1] 许红亮[1] 李勇辉[1] 张彬[1] 陈德良[1] 靳晓增[1] 

机构地区：[1]郑州大学材料科学与工程学院,郑州450001

出　　处：《人工晶体学报》2013年第11期2322-2327,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(40872102);郑州大学大学生创新性实验计划(121045911)

摘　　要：以高岭土为载体、钛酸丁酯为钛源，采用溶胶一凝胶法制备出高岭土／纳米TiO2复合光催化材料。采用XRD、SEM、EDS等方法对其物相组成和显微结构进行了表征，以亚甲基蓝（MB）溶液为目标降解物对其光催化性能进行了研究。结果表明：高岭石的粒径明显减小，且晶片表面负载了大量10～30nm的锐钛矿相TiO2晶粒。复合光催化材料对MB分子的去除率随光催化反应时间的延长逐步提高，且受TiO2负载量、投入量、MB溶液浓度的影响；当TiO2负载量为5mmol／g、投入量为2g／L、MB溶液为10mg／L时，暗反应吸附1h、光催化90min后对MB的去除率可达89．26％，显示出较好的光催化性能和去除效果。随着循环利用次数的增加，复合粉体的光催化性能逐步提高，并具有较高的回收率。Kaolin/nano-TiO2 composite photocatalyst was prepared by sol-gel using natural kaolin as support and tetrabutyl titanate as the TiO2 precursor. The phase composition and microstructure of the composite were characterized by XRD, SEM and EDS. The photocatalytic property was evaluated by the degradation of the methylene blue （MB） solution. The results showed that the diameter of kaolinite decreased significantly. Many anatase nano-grains, with the size of 10-30 nm, were loaded on the surface of kaolinite. The removal rate of MB increased as thephotoeatalytic reaction time extending, and it was influenced by the input rate of composite powder, the concentration of MB solution and the load ratio of TiO2 on kaolinite. When the loading ratio of TiO2 was 5 mmol/g, and the input rate of composite powder was 2 g/L while the concentration of MB solution was 10 mg/L, the removal rate of MB reached 89.26% after absorbing for 1 h and then photocatalytic reacting for 90 min, which exhibited excellent photocatalytic properties and removing effect of the kaolin/ nano-TiO2 composite. The composite powder had higher recovery rate when recycled, and the photocatalytic property increased gradually with the recycle times increasing.

关 键 词：高岭土 纳米TIO2 溶胶-凝胶法 光催化 亚甲基蓝 

分 类 号：TB322[一般工业技术—材料科学与工程]