整体多通道Fe-Fe_2O_3活化H_2O_2降解苯酚性能研究
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摘要
采用阳极氧化法成功制备出整体多通道Fe-Fe_2O_3,并以整体多通道Fe-Fe_2O_3为阴极,铂片为阳极,外加H_2O_2,构建非均相芬顿体系,利用电催化作用促进Fe(Ⅲ)还原为Fe(Ⅱ).结果显示:在溶液pH为7,H_2O_2浓度为1.0 mmol/L,施加电压为-0.4 V的条件下,苯酚去除率在60 min内能够达到96%,这表明整体多通道Fe-Fe_2O_3是较理想的非均相催化剂.ICP溶出测试结果说明,电催化作用能够有效促进Fe(Ⅲ)还原为Fe(Ⅱ),从而提高催化效率.
The Fe-Fe_2O_3 monolith is successfully prepared by anodization method. Fe-Fe_2O_3 monolith and Pt sheet are employed as the cathode and anode, respectively, and H_2O_2 is added externally to construct the heterogeneous Fenton system. Meanwhile, the Fe(Ⅲ) is reduced to Fe(Ⅱ) by electrocatalysis. It is found that the phenol removal rate can reach 96% in 60 min under the condition in which pH is 7, H_2O_2 concentration is 1.0 mmol/L and applied voltage is-0.4 V. The result shows that Fe-Fe_2O_3 monolith is an ideal heterogeneous catalyst. The results of ICP test show that electrocatalysis can effectively promote the reduction of Fe(Ⅲ) to Fe(Ⅱ), thereby improve catalytic efficiency.
The Fe-Fe_2O_3 monolith is successfully prepared by anodization method. Fe-Fe_2O_3 monolith and Pt sheet are employed as the cathode and anode, respectively, and H_2O_2 is added externally to construct the heterogeneous Fenton system. Meanwhile, the Fe(Ⅲ) is reduced to Fe(Ⅱ) by electrocatalysis. It is found that the phenol removal rate can reach 96% in 60 min under the condition in which pH is 7, H_2O_2 concentration is 1.0 mmol/L and applied voltage is-0.4 V. The result shows that Fe-Fe_2O_3 monolith is an ideal heterogeneous catalyst. The results of ICP test show that electrocatalysis can effectively promote the reduction of Fe(Ⅲ) to Fe(Ⅱ), thereby improve catalytic efficiency.
引文
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[4] ZHU Maiyong,DIAO Guowang.Magnetically recyclable Pd nanoparticles immobilized on magnetic Fe3O4@C nanocomposites:preparation,characterization,and their catalytic activity toward Suzuki and Heck coupling reactions [J].Journal of Physical Chemistry C,2011,115(50):24743-24749.
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[6] QIAN Xufang,REN Meng,ZHU Yao,et al.Visible light assisted heterogeneous Fenton-like degradation of organic pollutant via α-FeOOH/mesoporous carbon composites [J].Environmental Science and Technology,2017,51(7):3993-4000.
[7] DENG Jingheng,JIANG Jingyuan,ZHANG Yuanyuan,et al.FeVO4 as a highly active heterogeneous Fenton-like catalyst towards the degradation of Orange Ⅱ [J].Applied Catalysis B:Environmental,2008,84(3/4):468-473.
[8] MEEKS N D,SMULEAC V,STEVENS C,et al.Iron-based nanoparticles for toxic organic degradation:Silica platform and green synthesis [J].Industrial and Engineering Chemistry Research,2012,51(28):9581-9590.
[9] INCHAURRONDO N,FONT J,RAMOS C P,et al.Natural diatomites:Efficient green catalyst for Fenton-like oxidation of Orange Ⅱ [J].Applied Catalysis B:Environmental,2016,181:481-494.
[10] GAO Cong,CHEN Shuo,QUAN Xie,et al.Enhanced Fenton-like catalysis by iron-based metal organic frameworks for degradation of organic pollutants [J].Journal of Catalysis,2017,356:125-132.
[11] DUAN Feng,YANG Yuezhu,LI Yuping,et al.Heterogeneous Fenton-like degradation of 4-chlorophenol using iron/ordered mesoporous carbon catalyst [J].Journal of Environmental Sciences,2014,26(5):1171-1179.
[12] ZHANG Yuting,LIU Cao,XU Bingbing,et al.Degradation of benzotriazole by a novel Fenton-like reaction with mesoporous Cu/MnO2:Combination of adsorption and catalysis oxidation [J].Applied Catalysis B:Environmental,2016,199:447-457.
[13] YANG X J,XU Ximeng,XU Jing,et al.Iron oxychloride (FeOCl):an efficient Fenton-like catalyst for producing hydroxyl radicals in degradation of organic contaminants [J].Journal of the American Chemical Society,2013,135(43):16058-16061.
[14] ALEMAN J,CHADWICK A V,HE J,et al.Definitions of terms relating to the structure and processing of sols,gels,networks,and inorganic-organic hybrid materials [J].Pure and Applied Chemistry,2007,79(10):1801-1829.
[15] 单伟根.泡沫铁及铁镍合金的制备与性能分析 [D].南京:南京航空航天大学,2012.SHAN Weigen.Preparation of foamed iron and nickel-iron alloy material and study on its properties [D].Nanjing:Nanjing University of Aeronautics and Astronautics,2012.(in Chinese)
[16] NITHYANANDAM K,MAHAJAN R L.Evaluation of metal foam based thermoelectric generators for automobile waste heat recovery [J].International Journal of Heat and Mass Transfer,2018,122:877-883.
[17] XIE Keyu,LI Jie,LAI Yanqing,et al.Highly ordered iron oxide nanotube arrays as electrodes for electrochemical energy storage [J].Electrochemistry Communications,2011,13(6):657-660.