Fe/TiO_2-CeO_2催化剂室温高效催化降解甲基橙研究  

Fe/TiO_2-CeO_2 Catalysts for Highly Efficient Degradation of Methyl Orange at Room Temperature

作　　者：袁强[1] 江玲[1] 李辉[1] 汤清虎[2] 

机构地区：[1]贵州大学化学与化工学院,贵阳550025 [2]河南师范大学化学与环境科学学院,河南新乡453007

出　　处：《河南师范大学学报（自然科学版）》2010年第6期87-91,共5页Journal of Henan Normal University(Natural Science Edition)

基　　金：贵州省自然科学基金(20072013);贵州大学人才基金(X060025)

摘　　要：采用溶胶-凝胶（sol-gel）和浸渍相结合的方法制备Fe/TiO2-CeO2催化剂,以X射线衍射（XRD）和N2物理吸附-脱附对催化剂结构进行了表征.结果表明,Ti的添加抑制CeO2晶粒长大,使TiO2-CeO2具有更小的晶粒尺寸和更高的比表面积.甲基橙催化降解的结果表明当催化剂中Fe,Ti,Ce摩尔比为1∶2∶6时催化剂活性最高,以H2O2为氧化剂对10.0 mg.L-1甲基橙溶液进行催化湿式氧化反应,在低温5~30℃范围内,催化剂均表现出高的催化活性.室温25℃时,当催化剂和氧化剂H2O2（30.0wt%）用量分别为0.07 g和0.04 mol.L-1时,50 min后甲基橙的降解率达96%,且6.0wt%Fe/10.0wt%TiO2-90.0wt%CeO2催化剂的催化性能是6.0wt%Fe/CeO2的1.5倍.同时,催化剂重复性实验结果表明6.0wt%Fe/10.0wt%TiO2-90.0wt%CeO2催化剂具有良好的稳定性.Fe/TiO2-CeO2 catalysts are prepared by sol-gel and impregnation method.The structures of catalysts are characterized by X-ray diffraction（XRD） and N2 adsorptionand-desorption.The results of characterizations show that addition of Ti into CeO2 restrains the growth of crystal,decreases the particle size and increases the specific surface area.The most active catalyst of Fe /TiO2-CeO2 is obtained with 1∶2∶6 molar ratio of Iron,titanium and cerium（noted as 6.0 wt%Fe/10.0 wt%TiO2-90.0 wt%CeO2）.In the Range of 5-30 ℃,the 6.0 wt%Fe/10.0 wt%TiO2-90.0 wt%CeO2 catalyst towards 10.0 mg·L-1 Methyl Orange with H2O2 as oxidant displays highly catalytic activity.Furthermore,at room temperature（25 ℃）,the degradation percentage of Methyl Orange is 96 % with the amount of 0.07 g catalyst and 0.04 moL·L-1 H2O2（30 wt%） after reacting 50 minutes.Furthermore,the catalytic activity of 6.0 wt%Fe/10.0 wt%TiO2-90.0 wt%CeO2 is 1.5 times higher than that of 6.0 wt%Fe/CeO2.At the same time,the repetitive experimental results of catalyst have shown that the catalyst has excellent stability.

关 键 词：催化氧化 铁 氧化钛 氧化铈 过氧化氢 甲基橙 

分 类 号：O643[理学—物理化学]