Fe/TiO_2-CeO_2催化剂室温高效催化降解甲基橙研究

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 for Highly Efficient Degradation of Methyl Orange at Room Temperature

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.