摘要
利用溶胶凝胶的方法制备具有不同比表面和孔大小的氧化钛陶瓷 ,形成高活性氧化钛的最佳合成路线为 :H+/Ti 0 .1～1 ,胶体溶液在敞口烧杯中于 85～ 95℃下加热 1 2 h,在室温和一定湿度下形成半透明的干胶 ,50 0℃下煅烧干胶 5h.以甲基橙为模型化合物 ,通过它在高压汞灯下的脱色评价氧化钛催化剂的光效率 . 2 0 mg/L的甲基橙经光照的氧化钛 2 h的催化 ,脱色率达到 55.6% .最佳催化剂的活性随着反应时间趋于平衡 .
A variety of porous titania ceramics with different specific area and pore size was prepared by sol gel techniques.The high active photocatalyst was obtained by the following conditions.The suitable range of acidity was H +/Ti 0 1～1,colloidal solution in a open beaker was heated in air at 85～95℃ for 12h,and then forming a stable sols,the later,a transparent xerogel titania occurred in room temperature and given humidity,finally,the xerogel titania was calcined in air at 500℃ for 5h.The photocatalytic efficiency of titania ceramics was evaluated by the photodegradation of methyl orange under high pressure mercury lamp irradiation.55 6% decolorization conversion of methyl orange was got by titania ceramics photocatalysis for 2h.Photoactivity of titania gradually changed steady with reaction time.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2000年第3期71-73,共3页
Environmental Science
基金
国家自然科学基金!资助项目 ( Project Supported by theNational Natural Science Foundation of China) :2 96370 1 0
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