α-Fe_2O_3活性炭的制备以及对亚甲基蓝去除影响
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摘要
通过浸渍法制备α-Fe_2O_3负载活性炭(α-Fe_2O_3-AC),探究不同pH、Fe_2O_3负载量、反应温度和紫外激发/H_2O_2体系对模拟废水中亚甲基蓝去除的影响。结果表明在吸附温度为25℃、pH=7的条件下,投加1 g负载有0.2 g/L的α-Fe_2O_3活性炭,反应2 h达到平衡,对亚甲基蓝的去除效率达到95.11%,高于其他条件下的去除率。XRD实验结果显示,在0.2 g/L的负载量下,活性炭上有较多的α-Fe_2O_3掺杂。在紫外激发和投加H_2O_2条件下,未见去除率有进一步提升,可能是负载Fe的形态未激发类Fenton反应产生·OH。实验的结论为α-Fe_2O_3负载活性炭在降解亚甲基蓝的废水中的可行性和有效性提供了一定的理论参考。
Methylene blue(MB) was absorbed by a manufactured α-Fe_2 O_3 loaded activated carbon(α-Fe_2 O_3-AC),which was synthesized by dip-molding method.The effect of pH,loaded Fe_2 O_3 concentration,reaction temperature and addition of H_2 O_2 under UV exposure on the MB removal rates of simulated wastewater was studied.The results indicated that,under the conditions of 25 ℃ and pH=7,MB removal can be reached 95.11% at the addition of 1 g α-Fe_2 O_3-AC(0.2 g/L α-Fe_2 O_3 loaded) at2 h adsorption equilibrium time,which was higher than that of under other conditions.The result of XRD showed that moreα-Fe_2 O_3 was loaded on activated carbon at 0.2 g/L α-Fe_2 O_3.With the synergistic effect of UV exposure and H_2 O_2 addition,the MB removal efficiency was not observed as ascend trend,which may attributed to no hydroxyl radical(·OH) was produced.The slight adsorption efficiency of α-Fe_2 O_3-AC compared to AC may result in extra adsorption sites providing by doped α-Fe_2 O_3.Results will provide further theory and application in MB wastewater removal.
Methylene blue(MB) was absorbed by a manufactured α-Fe_2 O_3 loaded activated carbon(α-Fe_2 O_3-AC),which was synthesized by dip-molding method.The effect of pH,loaded Fe_2 O_3 concentration,reaction temperature and addition of H_2 O_2 under UV exposure on the MB removal rates of simulated wastewater was studied.The results indicated that,under the conditions of 25 ℃ and pH=7,MB removal can be reached 95.11% at the addition of 1 g α-Fe_2 O_3-AC(0.2 g/L α-Fe_2 O_3 loaded) at2 h adsorption equilibrium time,which was higher than that of under other conditions.The result of XRD showed that moreα-Fe_2 O_3 was loaded on activated carbon at 0.2 g/L α-Fe_2 O_3.With the synergistic effect of UV exposure and H_2 O_2 addition,the MB removal efficiency was not observed as ascend trend,which may attributed to no hydroxyl radical(·OH) was produced.The slight adsorption efficiency of α-Fe_2 O_3-AC compared to AC may result in extra adsorption sites providing by doped α-Fe_2 O_3.Results will provide further theory and application in MB wastewater removal.
引文
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[3]徐恩兵,李坤权,朱志强,等.双孔介孔碳的合成及其对亚甲基蓝的吸附[J].环境化学,2015(1):137-143.
[4]廖钦洪,刘庆业,蒙冕武,等.稻壳基活性炭的制备及其对亚甲基蓝吸附的研究[J].环境工程学报,2011,5(11):2447-2452.
[5] Bedin K C,Martins A C,Cazetta A L,et al.KOH-activated carbon prepared from sucrose spherical carbon:Adsorption equilibrium,kinetic and thermodynamic studies for Methylene Blue removal[J].Chemical Engineering Journal,2016,286(Supplement C):476-484.
[6] Zhou L,Shao Y,Liu J,et al.Preparation and characterization of magnetic porous carbon microspheres for removal of methylene blue by a heterogeneous Fenton reaction[J].ACS Applied Materials&Interfaces,2014,6(10):7275-7285.
[7]许盛彬.活性炭负载纳米零价铁诱发芬顿反应降解甲基橙的研究[D].哈尔滨:哈尔滨工业大学,2015.
[8]龚斌,银玉容,何其,等.纳米α-Fe2O3/H2O2异相Fenton催化降解酸性橙7[J].精细化工,2016,33(7):825-831.
[9]袁晓卫,杨骞,刘琦,等.α-Fe2O3空心球的水热法制备及其对苯酚的吸附性能[J].无机化学学报,2010,26(2):285-292.
[10]刘玉洋,付丹丹,赵雅萍.α-Fe2O3/GO催化类Fenton高级氧化技术去除亚甲基蓝的研究[C]∥第十三届全国水处理化学大会暨海峡两岸水处理化学研讨会.南京:中国化学会,2016:1.
[11] Zhou L,Ma J,Zhang H,et al.Fabrication of magnetic carbon composites from peanut shells and its application as a heterogeneous Fenton catalyst in removal of methylene blue[J].Applied Surface Science,2015,324(Supplement C):490-498.
[12] Cha B J,Woo T G,Park E J,et al.Photo-catalytic activity of hydrophilic-modified TiO2for the decomposition of methylene blue and phenol[J].Current Applied Physics,2017,17(11):1557-1563.
[13] Yang X,Chen W,Huang J,et al.Rapid degradation of methylene blue in a novel heterogeneous Fe3O4@rGO@TiO2-catalyzed photoFenton system[J].Scientific Reports,2015,5:10632.
[14] Barnes R J,Molina R,Xu J,et al.Comparison of TiO2and ZnO nanoparticles for photocatalytic degradation of methylene blue and the correlated inactivation of gram-positive and gram-negative bacteria[J].Journal of Nanoparticle Research,2013,15(2):1432.
[15]黄若宾,李松,胡建设,等.纳米Fe2O3对甲基橙、亚甲基蓝和罗丹明B的光催化降解研究[J].材料与冶金学报,2012,11(4):303-307.