摘要:
以高炉渣纤维(BFSF)为载体,采用溶胶凝胶法,在BFSF表面先后负载SiO2和TiO2制备TiO2/SiO2/BFSF光催化材料,考察了SiO2负载,TiO2溶胶浸渍次数、煅烧温度和重复利用次数等对材料光催化活性的影响。利用SEM、XRD等测试方法,对所制备样品的显微形貌和相组成进行了表征。以亚甲基蓝(MB)为光降解物,评价样品的光催化活性。试验结果表明,BFSF表面负载SiO2可以抑制TiO2晶粒长大,增加TiO2负载量和提高样品的光催化活性。TiO2溶胶负载3次,煅烧温度为450℃时,TiO2/SiO2/BFSF光催化材料表面形成均匀密实的锐钛矿型TiO2层,样品的光催化活性最好,紫外光照180 min时,亚甲基蓝的降解率为96.1%。TiO2/SiO2/BFSF光催化材料重复利用4次,亚甲基蓝的降解率依然能够达到67%。
Abstract:
Photocatalytic material of TiO2/SiO2/BFSF was prepared by loading SiO2 and TiO2 on the surface of blast furnace slag fibre(BFSF) in sequence using sol-gel process,with BFSF as the carrier.The effects of SiO2 loading,times of impregnation in TiO2 sol,calcination temperature and recycle times on photocatalytic activity of the prepared material were investigated.The microstructure and phase compositions of the obtained photocatalytic material were characterized by SEM and XRD,respectively.The photocatalytic activity of the material was evaluated by degradation of methylene blue(MB).The results show that SiO2 loaded on BFSF can inhibit the crystal growth of TiO2,increase loading capacity of TiO2 and enhance photocatalytic activity of the material.An uniform-compact anatase TiO2 layer was formed on the surface of TiO2/SiO2/BFSF with the most excellent photocatalytic activity under conditions of impregnation in TiO2 sol for 3 times and calcination at 450℃.With irradiation for 180 min under ultraviolet light,the degradation rate of MB can reach to 96.1% and maintain at 67% after 4 times of recycle of the TiO2/SiO2/BFSF photocatalytic material.
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