高炉水淬渣负载Fe_2O_3和TiO_2光催化材料的制备与表征

Preparation and Characterization of Photocatalytic Materials of Fe_2O_3 and TiO_2 Loaded on Water-quenched Blast Furnace Slag

以九水硝酸铁为铁源、钛酸四丁酯为钛源,以表面刻蚀的高炉水淬渣(water-quenched blast furnace slag,WBFS)为载体,采用溶胶凝胶法制备WBFS负载Fe_2O_3(Fe_2O_3/WBFS)和WBFS负载TiO_2(TiO_2/WBFS)以及WBFS负载Fe_2O_3和TiO_2(TiO_2/Fe_2O_3/WBFS)光催化材料。利用差热-热重、X射线衍射仪、扫描电子显微镜对光催化材料的物相和形貌进行表征。以亚甲基蓝为模拟污染物进行光催化实验。结果表明:Fe_2O_3/WBFS和TiO_2/WBFS光催化材料的适宜煅烧温度分别为700℃和450℃,其表面负载物相分别为赤铁矿型α-Fe_2O_3和锐钛矿型TiO_2。TiO_2/Fe_2O_3/WBFS光催化活性优于Fe_2O_3/WBFS和TiO_2/WBFS,在可见光照射360 min时,Fe_2O_3/WBFS、TiO_2/WBFS和TiO_2/Fe_2O_3/WBFS对亚甲基蓝的降解率分别达到80%、65%和90%。

Photocatalytic materials of Fe_2O_3 loaded on water-quenched blast furnace slag（ WBFS）（ Fe_2O_3/ WBFS）,TiO_2 loaded on WBFS（ TiO_2/ WBFS）,Fe_2O_3 and TiO_2 loaded on WBFS（ TiO_2/Fe_2O_3/ WBFS） were prepared by sol-gel method using ferric nitrate in nine water as source of iron and tetrabutyl titanate as titanium source,and surface etching of WBFS as the carrier. The phase structure and microstructure of the photocatalytic materials were characterized by using thermogravimetricdifferential thermal analysis（ DTA / TG）,X-ray diffractometry（ XRD）,scanning electron microscopy（ SEM）. The photocatalytic activities were evaluated by degrading of methylene blue in aqueous medium.The results show that the appropriate calcination temperatures of Fe_2O_3/ WBFS and TiO_2/ WBFS photocatalytic materials are 700 ℃ and 450 ℃ respectively,and the crystal structures are hematite and anatase for Fe_2O_3 and TiO_2 respectively at the appropriate heat treating temperature. Photocatalytic degradation effect is relatively higher in case of the TiO_2/ Fe_2O_3/ WBFS than Fe_2O_3/ WBFS and TiO_2/WBFS. Under visible light irradiation for 360 min,the degradation rate of methylene blue of Fe_2O_3/WBFS,TiO_2/ WBFS and TiO_2/ Fe_2O_3/ WBFS reaches 80%,65% and 90% respectively.