磁性Fe_3O_4/膨胀石墨对亚甲基蓝的吸附性能研究
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摘要
以膨胀石墨(EG)为载体,采用简单的水热法,制备出磁性Fe_3O_4/膨胀石墨(MEG)。采用X-射线衍射仪(XRD)和扫描电子显微镜(SEM)对MEG的组成结构和形貌进行表征。以亚甲基蓝为目标污染物,探讨了溶液pH值、吸附时间、盐离子浓度和亚甲基蓝初始浓度对吸附性能的影响,并对吸附动力学和吸附等温线进行研究。结果表明:当亚甲基蓝初始浓度为50 mg·L~(-1),pH值为7,吸附时间为60 min时,对亚甲基蓝的去除率和吸附量分别为97.03%和48.52 mg·g~(-1),随着溶液中盐离子Na~+和Ca~(2+)浓度的增加,MEG对亚甲基蓝的吸附性能降低;MEG对亚甲基蓝的吸附行为符合拟二级动力学模型和Langmuir等温吸附模型。MEG可以使用磁铁进行分离回收,回收率达95.71%。5次吸附-再生后,吸附量仍较高为41.72 mg·g~(-1),说明MEG吸附剂具有较稳定的重复使用能力。
Using expanded graphite( EG) as carrier,the magnetic Fe_3O_4/expanded graphite( MEG) was prepared by hydrothermal method. The structures and morphologies of the MEG were characterized by Xray diffraction( XRD) and Scanning electron microscope( SEM). Methylene Blue was used as a probe pollutant to investigate the effects of pH value, adsorption time, salt ionic strength and initial concentration on adsorption property,corresponding adsorption kinetics and adsorption isotherm were researched. The results indicate that the adsorption rate and adsorption capacity of 50 mg · L~(-1) methylene blue can reache 97. 03% and 48. 52 mg ·g~(-1) in the condition of pH 7,absorption time 60 min; The adsorption capacity reduces with the Na~+ and Ca~(2+) increase; the adsorption behavior is mainly in accordance with the pseudo-second-order kinetics model and Langmuir model. The recovery rate can reach 97. 51% by magnet. The adsorption amount for Methylene Blue is also 41. 72 mg·g~(-1) after five adsorption-regeneration cycles,which show that MEG has stable reuse ability.
Using expanded graphite( EG) as carrier,the magnetic Fe_3O_4/expanded graphite( MEG) was prepared by hydrothermal method. The structures and morphologies of the MEG were characterized by Xray diffraction( XRD) and Scanning electron microscope( SEM). Methylene Blue was used as a probe pollutant to investigate the effects of pH value, adsorption time, salt ionic strength and initial concentration on adsorption property,corresponding adsorption kinetics and adsorption isotherm were researched. The results indicate that the adsorption rate and adsorption capacity of 50 mg · L~(-1) methylene blue can reache 97. 03% and 48. 52 mg ·g~(-1) in the condition of pH 7,absorption time 60 min; The adsorption capacity reduces with the Na~+ and Ca~(2+) increase; the adsorption behavior is mainly in accordance with the pseudo-second-order kinetics model and Langmuir model. The recovery rate can reach 97. 51% by magnet. The adsorption amount for Methylene Blue is also 41. 72 mg·g~(-1) after five adsorption-regeneration cycles,which show that MEG has stable reuse ability.
引文
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[2]郑小刚,王姝羡,付文娣,等.Sm2O3/Ti O2对亚甲基蓝染料的光催化降解行为研究[J].人工晶体学报,2017,46(2):0361-0367.
[3]刘建红,贾志刚,李圣标,等.锰氧化物修饰铁酸钴纳米棒对亚甲基蓝的吸附性能[J].硅酸盐学报,2015,43(5):678-684.
[4]Gao S,Su J Z,Wang M,et al.Electrochemical oxidation degradation of azobenzene dye self-powered by multilayer-linkage triboelectric nanogenerator[J].Nano Energy,2016,30:52-58.
[5]Isarain-Cháveza E,Baróa M D,Rossinyol E,et al.Comparative electrochemical oxidation of methyl orange azo dye using Ti/Ir-Pb,Ti/Ir-Sn,Ti/Ru-Pb,Ti/Pt-Pd and Ti/Ru O2 anodes[J].Electrochimica Acta,2017:244:199-208.
[6]Kanagaraj J,Senthilvelan T,Panda R C.Degradation of azo dyes by laccase:biological method to reduce pollution load in dye wastewater[J].Clean Technologies and Environmental Policy,2015,17(6):1443-1456.
[7]Kiran S,Ali S,Asgher M.Degradation and Mineralization of Azo Dye Reactive Blue 222 by Sequential Photo-Fenton's Oxidation Followed by Aerobic Biological Treatment Using White Rot Fungi[J].Bulletin of Environmental Contamination and Toxicology,2013,90(2):208-215.
[8]Cai T,Li H J,Yang R,et al.Efficient flocculation of an anionic dye from aqueous solutions using a cellulose-based flocculant[J].Cellulose,2015,22(2):1439-1449.
[9]Wu H,Liu Z Z,Li A M,et al.Evaluation of starch-based flocculants for the flocculation of dissolved organic matter from textile dyeing secondary wastewater[J].Chemosphere,2017,174:200-207.
[10]Mohtor N H,Othman M H D,Ismail A F,et al.Investigation on the effect of sintering temperature on kaolin hollow fibre membrane for dye filtration[J].Environmental Science and Pollution Research,2017,24(19):15905-15917.
[11]Dumrongrojthanath P,Phuruangrat A,Junploy P,et al.Visible-light-driven photocatalysis of heterostructure Ag/Bi2WO6 nanocomposites and their photocatalytic degradation of dye under visible light irradiation[J].Research on Chemical Intermediates,2016,42(3):1651-1662.
[12]Mehrabiana M,Esteki Z.Degradation of methylene blue by photocatalysis of copper assisted Zn S nanoparticle thin films[J].Optik,2017,130:1168-1172.
[13]张迎迎,许珂敬,史晓慧,等.利用稻壳制备X型分子筛及性能研究[J].人工晶体学报,2014,43(11):2999-3005.
[14]Goswami M,Phukan P.Enhanced adsorption of cationic dyes using sulfonic acid modified activated carbon[J].Journal of Environmental Chemical Engineering,2017,5(4):3508-3517.
[15]Jamwala H S,Kumaria S,Chauhan G S,et al.Silica-polymer hybrid materials as methylene blue adsorbents[J].Journal of Environmental Chemical Engineering,2017,5:103-113.
[16]Belbachir I,Makhoukhi B.Adsorption of Bezathren dyes onto sodic bentonite from aqueous solutions[J].Journal of the Taiwan Institute of Chemical Engineers,2017,75:105-111.
[17]Yao T,Zhang Y G,Xiao Y P,et al.The effect of environmental factors on the adsorption of lubricating oil expanded graphite[J].Journal of Molecular liquids,2016,218:611-614.
[18]王凡非,冯启明,王维清,等.磁性膨胀石墨的制备及对油的吸附分离与再生[J].功能材料,2013,44(120):1782-1787.
[19]马文清,赫文芳,王雲生,等.磁性埃洛石复合材料的制备及其对亚甲基蓝吸附性能研究[J].硅酸盐通报,2017,36(1):242-248.
[20]陈培,徐红亮,张敏捷,等.纳米Fe3O4/高岭土复合粉体制备及其对亚甲基蓝吸附性能研究[J].人工晶体学报,2015,44(3):711-715.
[21]马千里,董相廷,王进贤,等.纳米四氧化三铁的化学制备方法研究进展[J].化工进展,2012,31(3):562-573.
[22]Bahadur A,Saeed A,Shoaib M,et al.Eco-friendly synthesis of magnetite(Fe3O4)nanoparticles with tunable size:Dielectric,magnetic,thermal and optical studies[J].Materials Chemistry and Physics,2017,198:229-235.
[23]伏渭娜,施翔宇,王付同,等.无硫膨胀石墨的制备及吸油性能[J].环境工程学报,2012,50(6):1518-1524.
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[25]Zhang W J,Zhou C J,Zhou W C,et al.Fast and Considerable Adsorption of Methylene Blue Dye onto Graphene Oxide[J].Bulletin of Environmental Contamination and Toxicology,2011,87:86-90.
[26]CHEN M J,SHEN H,LI X,et al.Facile synthesis of oil-soluble Fe3O4nanoparticles based on a phase transfer mechanism[J].Applied Surface Science,2014,307:306-310.
[27]王赛花,牛红云,蔡亚岐.新型石墨烯磁性复合材料的制备及其对水中亚甲基蓝的吸附去除[J].分析测试学报,2015,34(2):0127-0133.
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