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机构地区:[1]浙江大学化学系西溪校区,杭州310028 [2]浙江工业大学职业技术学校,杭州310014
出 处:《化学学报》2003年第8期1311-1315,共5页Acta Chimica Sinica
基 金:国家自然科学基金 (No.2 0 2 750 34);浙江工业大学科技发展基金 (No.2 0 0 2 0 1 )资助项目
摘 要:提出制备高效二氧化钛 /膨润土复合光催化材料的新方法焦硫酸钾熔融 /浸渍法 ,并通过改变二氧化钛 /膨润土的配比、反应时间、熔融灼烧温度等得到最佳制备条件 .采用XRD和TEM对该材料进行了表征 ,证实TiO2 呈高度分散状态 ,并已渗入膨润土层间结构 ,使层间距扩大 ,形成互不干扰的活性反应中心 .在模拟染料废水中 ,对复合材料的光催化降解性能进行了研究 .结果发现 ,采用焦硫酸钾熔融 /浸渍法制备的复合材料具有很高的光催化效率 ,对活性艳红染料的降解率达 93 .6% 。A new melting/calcinning method for preparing a titanium dioxide/bentonite composite material with high photo-catalytic activity is presented. The optimal conditions for the preparation are obtained by adjusting the ratio of TiO 2/bentonite, reaction time, the melting and calcinning temperature, etc. The composite material is characterized by XRD and TEM. It is found that the TiO 2 particles are highly spreaded and passed into the the lattice layer of bentonite. These particles enlarge the interlayer distance of the lattice and form many independent active centers for photo-catalysis. The photo-catalytic reaction is carried out in wastewater of dyestuff. The composite material prepared by the melting/calcinning method is highly active in degrading organic compounds. The decoloring ratio for bright red solution is 93.6%, much higher than pure TiO 2 and other similar materials.
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