作　　者： ; ; ; ; ;

机构地区： 湖南大学土木工程学院

出　　处： 《环境科学》 2012年第11期3840-3846,共7页

摘　　要： 在微波辐照干化的条件下用溶胶-凝胶法制备了MWNTs/TiO2复合光催化剂.对该复合材料的表征表明:随着微波功率逐渐增大至400 W,MWNTs/TiO2复合材料管径逐渐变小,且在400 W时制备的MWNTs/TiO2复合材料分散性较好.进一步增大微波功率导致复合材料的管径增大,分散性降低.研究了不同微波辐照条件下制备的MWNTs/TiO2复合光催化剂对1,2,3-三氯苯的光催化降解效果,结果表明,该复合光催化剂对1,2,3-三氯苯的光降解遵循一级反应动力学;在微波功率为400 W、辐照时间为5 min情况下制备的复合光催化剂对1,2,3-三氯苯的降解速率最快,其反应常数为0.023 7 min-1,该值比非微波加热干化的同样复合材料的反应速率常数值提高了52%. Composite photocatalyst,MWNTs/TiO2,is prepared using sol-gel method and dried through microwave irradiation.Characterization of the composite shows that,with the increase of microwave power till 400 W,the average diameter of MWNTs/TiO2 composite reduces gradually,and better dispersion of the composites is also acquired at the microwave power of 400 W.However,a further increase of the power results in the average diameter of the composite enlarged,and more aggregative composites are obtained.Furthermore,photodegradation of 1,2,3-trichlorobenzene（1,2,3-TCB） with the composite photocatalysts of MWNTs/TiO2 induced under different microwave conditions is studied.It is found that the photodegradation of 1,2,3-TCB follows the first-order kinetics.The microwaving conditions for producing the composite photocatalysts with the highest photocatalytic activity are further determined as 5min irradiation at 400 W.Under such conditions,the rate constant of 1,2,3-TCB photodegradation is 0.023 7 min^-1 which is elevated by 52% comparing to those obtained using non-microwaved composites.

关 键 词： 微波辐照 多壁碳纳米管 二氧化钛 光催化 复合光催化剂 三氯苯

领　　域： [环境科学与工程]