摘要
以钛酸丁酯为前驱体,采用醋酸为酸催化剂制备TiO2溶胶,将制备的溶胶分别加入经表面活性剂十六烷基三甲基溴化铵改性的河北、临安、安吉、内蒙古膨润土中,制备有机-钛柱撑膨润土复合光催化剂,并对其进行XRD、SEM、BET表征。结果表明,TiO2插入了膨润土层间,并以锐钛矿型的晶形存在,制备的复合光催化剂仍有较好的层状结构,其比表面积均比相对应的不同产地的膨润土的比表面积大。以甲基橙为目标污染物,考察了有机-钛柱撑膨润土复合光催化剂的吸附性能和光催化活性,发现所制备的复合光催化剂具有较好的光催化活性,而且用不同的膨润土合成的催化剂的光催化活性差别很大。膨润土的化学组成和层状结构上的差异是复合催化剂吸附性能和光催化活性差别的主要原因。其中有机-钛柱撑临安膨润土复合光催化剂的光催化活性最好。
The surfactants modified TiO2 pillared montmorillonites were prepared by Sol-gel method at certain ratio of Ti（OC4H9）4 to acetic acid by using montmorillonites from different localities, such as Hebei, Lin＇an and Anji, and Nei Mongol, China, and modified by cation surfactant Cetyltrimethyl ammonium bromide （CTMAB） at the same time. Scanning electron microscopy （SEM） and X-ray diffraction （XRD） were used to investigate the texture of prepared catalysts, and their BET surface areas were also measured. The results indicate that the pillared montmorillonites were well pillared by the anatase TiO2 and the BET surface areas were larger than the original one. The adsorption and photocatalytic performance of different prepared pillared clays were also studied by using methyl orange as mode organic pollutant. The pillared montmorillonites from different localities exhibited different adsorption and photocatalytic property which was mainly resulted from their different compositions and interlayer structures. Moreover, it is found that the TiO2 pillared clay by using Lin＇an montmorillonite is an excellent photocatalyst for the degradation of mode organic pollutant.
出处
《地球化学》
CAS
CSCD
北大核心
2006年第4期413-418,共6页
Geochimica
基金
国家自然科学基金(40302013
40572173)
广东省自然科学基金(030466)
广东省"十五"重大科技计划项目(2005A30401001)
