炭吸附La2O3/TiO2复合粉体的制备及其光催化性能研究

Preparation of LaO/TiO nanocomposite powder by carbon adsorption and study on its photocatalytic properties

采用炭吸附共沉淀法制备了La2O3/Ti O2催化剂,利用TG-DTG、XRD、TEM、UV-Vis等对催化剂进行表征,并考察了不同条件制备的La2O3/Ti O2对可见光催化甲基橙降解效果的影响。结果表明,炭黑的加入可有效阻止粉体在制备、干燥及焙烧过程中的团聚和烧结;在600℃煅烧后得到的粉体结晶度高、颗粒分散均匀、颗粒粒径小。在可见光照射1 h后,炭吸附沉淀法制备的La2O3/Ti O2对甲基橙的降解率高达92.25%,是普通沉淀法制得的La2O3/Ti O2的3倍,光催化活性显著提高。

La2O3/TiO2 photocatalyst is prepared by carbon adsorption co-precipitation method.The samples are characterized by TG-DTG,XRD,TEM and UV-Vis.The impacts of La2O3/Ti O2 prepared under different conditions on the degradation of methyl orange by using visible light irradiation are studied.Results show that the addition of carbon black during the reaction can effectively prevent the agglomeration and sintering of the particles during the preparation,drying and roasting processes.The powder obtained after calcination at 600℃ has high crystallinity,uniform particle dispersion,and small particle size.Under visible light irradiation for 1 h,the degradation rate of methyl orange over La2O3/TiO2 prepared by carbon adsorption co-precipitation method can reach as high as 92.25%,which is three times that over La2O3/TiO2 prepared by common precipitation method,representing a significantly improved photocatalytic activity.