磁性核壳型Fe_3O_4@CeO_2催化剂分解H_2O_2的性能研究
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摘要
催化湿式过氧化氢氧化是常见的一种降解水中有机物的方法,催化剂的加入能促使H_2O_2分解产生氧化能力更强且无选择性的羟基自由基,开发出性能优异的催化剂是该方法的关键所在。采用溶剂热法制备出磁性核壳型的Fe_3O_4@Ce O_2纳米催化剂,并采用N_2吸附-脱附、磁性测试和透射电子显微镜(TEM)对制备的Fe_3O_4@Ce O_2催化剂进行表征。考查Fe_3O_4及Fe_3O_4@Ce O_2分解H_2O_2的性能,结果表明,相比Fe_3O_4,Ce O_2包覆后的Fe_3O_4@Ce O_2分解的H_2O_2效率得到了提高。
Catalytic wet peroxide oxidation has been widely used in the removal of organic pollutants in water. The addition of catalyst can promote the decomposition of H2 O2 into hydroxyl radical,so catalyst plays an important role in this technology. A magnetic core-shell structured Fe3 O4@ CeO2 catalyst was prepared by solvothermal method. The obtained samples were characterized by N2 adsorption-desorption magnetic measurement and transmission electron microscopy( TEM). The decomposition of H2 O2 by Fe3 O4 and Fe3 O4@ CeO2 was investigated. The results indicated that compared to Fe3 O4,Fe3 O4@ CeO2 enhanced the decomposition efficiency of H2 O2.
Catalytic wet peroxide oxidation has been widely used in the removal of organic pollutants in water. The addition of catalyst can promote the decomposition of H2 O2 into hydroxyl radical,so catalyst plays an important role in this technology. A magnetic core-shell structured Fe3 O4@ CeO2 catalyst was prepared by solvothermal method. The obtained samples were characterized by N2 adsorption-desorption magnetic measurement and transmission electron microscopy( TEM). The decomposition of H2 O2 by Fe3 O4 and Fe3 O4@ CeO2 was investigated. The results indicated that compared to Fe3 O4,Fe3 O4@ CeO2 enhanced the decomposition efficiency of H2 O2.
引文
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[2]Rey A,Faraldos M,Casas J A,et al.Catalytic wet peroxide oxidation of phenol over Fe/AC catalysts:Influence of iron precursor and activated carbon surface[J].Applied Catalysis B:Environmental,2009,86(1):69-77.
[3]Rey A,Bahamonde A,Casas J A,et al.Selectivity of hydrogen peroxide decomposition towards hydroxyl radicals in catalytic wet peroxide oxidation(CWPO)over Fe/AC catalysts[J].Water Science&Technology,2010,61(11):2769-2778.
[4]Xu L,Wang J.Magnetic nanoscaled Fe3O4/CeO2composite as an efficient Fenton-like heterogeneous catalyst for degradation of 4-chlorophenol[J].Environmental Science&Technology,2012,46(18):10145-10153.
[5]孔丽萍,王呈呈,赵俊俊,等.磁性核壳结构二氧化铈负载Ru催化剂的制备、表征及在苯甲醇绿色氧化中的应用[J].物理化学进展,2016,5(2):27-38.
[6]Kruk M,Jaroniec M.Gas adsorption characterization of ordered organicinorganic nanocomposite materials[J].Chemistry of Materials,2001,13(10):3169-3183.
[7]Li K Y,Zhao Y Q,Song C S,et al.Magnetic ordered mesoporous Fe3O4/CeO2composites with synergy of adsorption and Fenton catalysis[J].Applied Surface Science,2017,425:526-534.