摘要
采用溶胶-凝胶法结合旋转涂膜法和微波烧结技术制备了Sm掺杂T iO2光催化材料。以罗丹明B为降解物,高压汞灯为光源,考察了微波功率、烧结时间、烧结温度、涂膜层数、稀土掺杂量等因素对T iO2光催化活性的影响;并用XRD、TG-DSC和SEM等对材料进行了表征。结果表明,采用微波分三阶段加热、升温时间65m in、烧结温度520℃、涂膜3层、Sm掺杂量x(Sm)=0.3%时,制备的光催化材料催化活性最高,5h内罗丹明B的降解率可达90%;与传统高温烧结相比,采用微波烧结缩短了烧结时间,降低了烧结温度,提高了光催化材料的活性。SEM检测结果表明,微波烧结样品的粒度比较均匀,晶粒明显细化。
Sm-doped TiO2 photocatalytic material was prepared by sol-gel method combined with spin-coating technique and microwave sintering process. Used Rhodamine B as degradation agent and ultraviolet lamp as light source, the effects of the microwave power ,sintering time ,sintering temperature ,layer number of the coatings and Sm doping amount on the photocatalytic activities of TiO2 were investigated. XRD, SEM and TG-DSC were employed to characterize the photocatalytic material. The results indicate that the highest photodegration ratio of Rhodamine B reaches 90% in 5 hours, meanwhile the optimum conditions for preparing Sm-doped TiO2 photocatalytic film were.. adopting three-step heating process ,heating time being 65 min,sintering temperature being 515 ℃,number of layers being 3,doping amount being x （Sm）= 0.3 %. Compared with the conventional sintering processing, microwave sintering process has shortened sintering time, reduced sintering temperature and improved the activities of the photocatalyst. SEM photograph shows the grain of the microwave sintered sample is fairly homogeneous and refines considerably.
出处
《稀土》
EI
CAS
CSCD
北大核心
2006年第3期1-6,共6页
Chinese Rare Earths
基金
国家自然科学基金(50104003)
关键词
微波烧结
溶胶-凝胶法
光催化
稀土掺杂
microwave sintering
sol-gel method
photocatalysis
rare earth doping
