溶胶凝胶水热法制备TiO2及光催化降解罗丹明B

以EO20PO70EO20(P123)为模板剂,采用溶胶-凝胶-水热法,制备介孔TiO2纳米粉体.利用红外、X射线衍射、紫外漫反射、氮气吸附脱附等手段对样品进行了测试.研究了体系的pH值对材料的晶型的影响,并以染料罗丹明B(RhB)作为模型污染物,考察粉体的光催化能力.结果表明,在酸性条件下可获得粒径为12.7 nm,平均孔径为17.8 nm,孔径分布较宽(5～35 nm),比表面积为68 m2/g的纯锐钛矿型介孔TiO2纳米粉体;而碱性条件下,可获得锐钛矿相和板钛矿相混晶介孔二氧化钛粉体;并且酸性条件下制备的粉体光催化效果较好.

Study on sol-gel hydrothermal synthesis and photocatalytic degradation of rhodamine B of mesoporous TiO2 powder

Nanoporous titania powder was prepared under sol-gel hydrothermal conditions by employing EO20PO70EO20(P123) as template,and characterized by means of FT-IR,XRD,UV diffuse reflection and N2 adsorption-sorption.The effect of the pH value on the crystal phase was discussed,and the photocatalytic performance of TiO2 powder was evaluated using rhodamine B(RhB) as a model pollutan.The results showed that the nanoporous anatase titania powders with particle size 12.7 nm,most probable pore size 17.8 nm,a wide pore size distribution from 5 to 35 nm and specific surface area up to 68 m2/g were prepared under the acid condition,and the powder had the best photocatalytic activity,however,porous titanium dioxide powder with the mixed anatase and the brookite was prepared under the base condition.