不同制备方法对氧化铁/氧化铝催化剂催化活性的影响研究
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摘要
采用水热法、溶胶-凝胶法和大分子网络凝胶法合成了氧化铁/氧化铝(Fe2O3/Al2O3)催化剂。通过X射线粉末衍射表征可知,采用水热法和溶胶-凝胶法合成的氧化铁/氧化铝催化剂的物相为六方α-氧化铝相,而大分子网络凝胶法合成的氧化铁/氧化铝催化剂除了六方α-氧化铝相外还含有少许氧化铁的衍射峰。以酸性橙为考察对象,研究了氧化铁/氧化铝催化剂对酸性橙降解率随反应时间、催化剂质量浓度以及初始pH的变化,结果表明制备的氧化铁/氧化铝催化剂具有良好的催化活性。催化实验结果还表明,氧化铁/氧化铝催化剂催化降解酸性橙的适宜条件为pH=5、催化剂质量浓度为0.8 mg/L、酸性橙质量浓度为15 mg/L。
Fe_2O_3/Al_2O_3 catalysts were synthesized by hydrothermal method,sol-gel method,and a polyacrylamide gel method,respectively.X-ray powder diffraction results indicated that the as-synthesized Fe_2O_3/Al_2O_3 catalyst by hydrothermal method and sol-gel method were α-Al_2O_3 phase,however,the as-synthesized Fe_2O_3/Al_2O_3 catalyst by polyacrylamide gel method crystallize majorly into α-Al_2O_3 and Fe_2O_3 without the presence of any other impurities.Catalysis experimental design was used and the influences of initial pH,catalyst mass concentration,and reaction time on the yield were investigated.The results also indicated that the Fe_2O_3/Al_2O_3 catalyst prepared by polyacrylamide gel method exhibited the highest catalytic activity.The catalysis experiments also revealed that the Fe_2O_3/Al_2O_3 catalyst exhibited a pronounced catalytic activity for the acid orange decomposition at different reaction times.The optimum conditions for the catalytic experiments of Fe_2O_3/Al_2O_3 catalyst prepared by polyacrylamide gel method were determined to be as follows:pH=5,mass concentration of catalyst was 0.8 mg/L,and mass concentration of acid orange was 15 mg/L.
Fe_2O_3/Al_2O_3 catalysts were synthesized by hydrothermal method,sol-gel method,and a polyacrylamide gel method,respectively.X-ray powder diffraction results indicated that the as-synthesized Fe_2O_3/Al_2O_3 catalyst by hydrothermal method and sol-gel method were α-Al_2O_3 phase,however,the as-synthesized Fe_2O_3/Al_2O_3 catalyst by polyacrylamide gel method crystallize majorly into α-Al_2O_3 and Fe_2O_3 without the presence of any other impurities.Catalysis experimental design was used and the influences of initial pH,catalyst mass concentration,and reaction time on the yield were investigated.The results also indicated that the Fe_2O_3/Al_2O_3 catalyst prepared by polyacrylamide gel method exhibited the highest catalytic activity.The catalysis experiments also revealed that the Fe_2O_3/Al_2O_3 catalyst exhibited a pronounced catalytic activity for the acid orange decomposition at different reaction times.The optimum conditions for the catalytic experiments of Fe_2O_3/Al_2O_3 catalyst prepared by polyacrylamide gel method were determined to be as follows:pH=5,mass concentration of catalyst was 0.8 mg/L,and mass concentration of acid orange was 15 mg/L.
引文
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[3]曲华.纳米氧化锌/γ-氧化铝复合物制备及其光催化性能研究[J].无机盐工业,2011,43(12):32-35.
[4]郭子峰,王林江.有机废水氧化催化剂氧化铁-二氧化锰-二氧化钛/γ-氧化铝的研究[J].无机盐工业,2009,41(5):33-35.
[5]胡旸.Fe2O3/Al2O3催化剂制备条件对其催化降解含聚丙烯酰胺废水活性的影响[J].天津科技大学学报,2010,25(3):39-42.
[6]唐玲玲,卢明辉.非均相Fe2O3/γ-Al2O3催化降解木质素模型物愈创木酚[J].天津科技大学学报,2014,29(4):30-34.
[7]胡燚,李慧,赵伟,等.不同合成方法对Fe2O3/γ-Al2O3表面性质及乙醇脱水性能的影响[J].现代化工,2010,30(8):39-42.
[8]刘越男,吕效平.超声浸渍法制备Fe3O4/γ-Al2O3催化剂及其表征、活性研究[J].化工学报,2007,58(11):2805-2809.
[9]孙春晖,于海斌,陈永生,等.氧化铝载体对镍/氧化铝催化剂性能的影响[J].无机盐工业,2014,46(12):79-80.
[10]李晓云,于海斌,孙彦民,等.水热合成水合氧化铝的研究进展[J].无机盐工业,2015,47(11):7-10.
[11]Wang S F,Xiang X.Role of p H,organic additive,and chelating agent in gel synthesis and fluorescent properties of porous monolithic alumina[J].J.Phys.Chem.C,2013,117(10):5067-5074.
[12]才红.铁掺杂氧化锌制备及对有机染料的光催化降解[J].无机盐工业,2014,46(12):71-74.
[13]刘琰,孙德智,李磊.Fe2O3/γ-Al2O3催化剂的制备表征及其催化活性的研究[J].材料工程,2007(5):19-23.