摘要
首先采用化学共沉淀法制备尖晶石型CoFe2O4,然后采用溶胶-凝胶法与钛酸丁四酯复合制备不同CoFe2O4载量(质量分数,下同)的CoFe2O4/TiO2磁性光催化剂。再利用X射线衍射(XRD)、透射电子显微镜(TEM)、振动样品磁强计(VSM)、同步热分析仪(TG-DSC)和紫外可见吸收光谱(UV-Vis)分别对物相、形貌、磁学性能等进行了分析和表征。最后在300 W紫外灯(主波长为253.7nm)照射下降解一定浓度的甲基橙溶液,研究不同CoFe2O4载量的CoFe2O4/TiO2磁性光催化剂在相变温度下对甲基橙溶液降解效果。结果表明,合成的CoFe2O4结晶度高,粒径为10～20nm,具尖晶石结构。CoFe2O4能较为均匀地负载于TiO2表面,CoFe2O4/TiO2磁性光催化剂具有超顺磁性。CoFe2O4/TiO2磁性光催化剂对甲基橙降解性能随CoFe2O4载量增加而降低。
Firstly,spinel type CoFe2O4 magnetic particles were prepared by chemical coprecipitation method,and CoFe2O4/TiO2 magnetic photocatalysts with different contents of CoFe2O4 were prepared by sol-gel method using CoFe2O4 and tetrabutyl.Secondly,the phase,morphology and magnetic properties of the product were characterized by X-ray diffraction（XRD）,transmission electron microscope（TEM）,vibration sample magnetization（VSM）,simultaneous thermal analyzer（TG-DSC）and UV-visible absorption spectrum（UV-Vis）.Finally,the degradation effects of CoFe2O4/TiO2 magnetic photocatalysts to the solution of methyl orange at phase transition temperature and different contents of CoFe2O4 in 300 W UV-lamp（main wavelength of 253.7nm）was studied.The results showed that the granularity of CoFe2O4 magnetic particles was 10 to 20nm with high crystallinity and good spinel structure.CoFe2O4 particles adhered to the surface of TiO2 and the CoFe2O4/TiO2 magnetic photocatalysts had superparamagnetization.With the calcination temperature increased,the degradability of CoFe2O4/TiO2 magnetic photocatalysts for methyl orange was decreased.
出处
《化工新型材料》
CAS
CSCD
北大核心
2013年第8期129-131,共3页
New Chemical Materials
基金
国家自然科学基金资助项目(50804039)
