以钛酸丁酯为Ti源,六次甲基四胺为N源,偏钒酸铵为V源,正硅酸乙酯为Si源,采用溶胶-凝胶法制备N-V-Si-TiO2纳米材料.通过BET、UV-Vis 和 XRD等检测手段对 N-V-Si-TiO2的表面结构、晶型比例等进行表征分析,研究其在可见光条件下对甲醛、甲苯及 SO2的可见光催化性能.结果表明,煅烧温度500℃、掺氮28％、掺钒1％、掺硅5％的 N-V-Si-TiO2平均孔径小、比表面积大、对可见光的吸收能力强,其催化降解甲醛、甲苯及SO2的效率最高分别可达89．6％,85．4％和98．7％,与 N-V-TiO2和纯 TiO2相比效率显著提高.N-V-Si-TiO2连续使用时间可达9 h,与N-V-TiO2和纯TiO2相比延长3~4 h,样品失活后再生恢复率最高可达95％,且重复使用5次后仍具有相当高的活性.
N-V-Si-codoped nanosized TiO2 powders were prepared by the sol-gel method with tetrabutyl titanate as Ti resource,hexamethylene tetramine as N resource,ammonium metavanadate as V resource and ethyl sili-cate as Si source.The surface structure and crystal ratio of N-V-Si-TiO2 powders were characterized by BET, UV-Vis and XRD.The photocatalytic decomposition property of N-V-Si-TiO2 to formaldehyde,toluene and SO2 under visible light was investigated.The results showed that the N-V-Si-TiO2 of calcination temperature at 500 ℃,the N-doped amount of 28%(molar ratio),the V-doped amount of 1%(molar ratio)and the Si-doped a-mount of 5% (molar ratio)has a small average pore size,a large specific surface area and a strong absorption a-bility under visible light.The degradation efficiency of formaldehyde,toluene and SO2 can up to 89.6%,83.4%and 98.7%,which are highly improved than that of N-V-TiO2 and pure TiO2 respectively.The continuous using time of N-V-Si-TiO2 can be up to 9 h,which is 3-4 h longer than that of N-V-TiO2 and pure TiO2 .The regener-ative recovery rate of the deactivation sample is up to 9 5%,and it has a quite high activity after reuse for 5 times.
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