纳米氢氧化镁对水中络合态三价铬的吸附研究
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摘要
采用室温固相反应法成功合成了纳米片状氢氧化镁,采用X射线衍射仪(XRD)、扫描电镜(SEM)、比表面积分析仪(BET)、X射线光电子能谱(XPS)等对样品进行了表征。系统性研究了吸附量、初始浓度、接触时间和共存离子对纳米片状氢氧化镁吸附低浓度EDTA络合的三价铬(Cr(Ⅲ)-EDTA)废水的影响,结果表明:纳米片状氢氧化镁对Cr(Ⅲ)-EDTA的最大吸附量为178. 65 mg/g,吸附等温线符合Freundlich模型,吸附动力学与准二级动力学方程相拟合,高浓度的阳离子对氢氧化镁去除水中的络合物Cr(Ⅲ)-EDTA基本无影响。
The nano-sheet magnesium hydroxide was successfully synthesized by solid phase method. Samples were characterized by XRD, SEM, BET and XPS. The effects of adsorption amount, initial concentration, contact time and coexisting ions on the adsorption of low-concentration EDTA complexed with trivalent chromium (Cr(Ⅲ)-EDTA) in wastewater by nano-sheet magnesium hydroxide were systematically studied. The results show that the maximum adsorption of nano-sheet magnesium hydroxide on Cr(Ⅲ)-EDTA. is 178. 65 mg/g. Adsorption isotherm is consistent with the Freundlich model and the kinetic experimental data is fitting to the pseudo-second order kinetic models. The high concentration of cation has no effect on the removal of the complex Cr(Ⅲ)-EDTA in magnesium hydroxide.
The nano-sheet magnesium hydroxide was successfully synthesized by solid phase method. Samples were characterized by XRD, SEM, BET and XPS. The effects of adsorption amount, initial concentration, contact time and coexisting ions on the adsorption of low-concentration EDTA complexed with trivalent chromium (Cr(Ⅲ)-EDTA) in wastewater by nano-sheet magnesium hydroxide were systematically studied. The results show that the maximum adsorption of nano-sheet magnesium hydroxide on Cr(Ⅲ)-EDTA. is 178. 65 mg/g. Adsorption isotherm is consistent with the Freundlich model and the kinetic experimental data is fitting to the pseudo-second order kinetic models. The high concentration of cation has no effect on the removal of the complex Cr(Ⅲ)-EDTA in magnesium hydroxide.
引文
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[22]Fiol N, Escudero C, Villaescusa I. Chromium sorption and Cr(Ⅵ)reduction to Cr(Ⅲ)by grape stalks and yohimbe bark.[J]. Bioresour Technol, 2008, 99(11):5 030-5 036.
[2]Chao W, Zhang W, Liao X,et al. Transposition of chrome tanning in leather making[J]. Journal of the American Leather Chemists Association,2014,109:176-183.
[3]梁奇峰.铬与人体健康[J].广东微量元素科学,2006,13(2):67-69.
[4]田慧捷.重金属铬对小球藻和发光细菌的联合毒性效应研究[D].大连:大连海事大学,2011.
[5]Sillanp(a|¨)(a|¨)M E T, Kurniawan T A, Lo W H. Degradation of chelating agents in aqueous solution using advanced oxidation process(AOP)[J]. Chemosphere, 2011,83(11):1 443-1 460.
[6]Jiraroj D, Unob F, Hagège A. Degradation of Pb-EDTA complex by a H_20_2/UV process[J]. Water Research, 2006, 40(1):107-112.
[7]黄君涛,熊帆,谢伟立,等.吸附法处理重金属废水研究进展[J].水处理技术,2006, 32(2):9-12.
[8]Mohan D, Jr P C. Activated carbons and low cost adsorbents for remediation of tri-and hexavalent chromium from water[J]. Journal of Hazardous Materials, 2006, 137(2):762-811.
[9]Wan Z, Li M, Zhang Q, et al. Concurrent reduction-adsorption of chromium using m-phenylenediamine modified magnetic chitosan:Kinetics, isotherm, and mechanism[J]. Environmental Science&Pollution Research, 2018:1-12.
[10]Escudero C, Gabald6n C, Marzal P, et al. Effect of EDTA on divalent metal adsorption onto grape stalk and exhausted coffee wastes[J]. Journal of Hazardous Materials, 2008, 152(2):476-485.
[11]Liu J, Wang H L, LO C X, et al. Remove of heavy metals(Cu~(2+), Pb~(2+), Zn~(2+)and Cd~(2+))in water through modified diatomite[J]. Chemical Research in Chinese Universities, 2013,29(3):445-448.
[12]Boonamnuayvitaya V, Chaiya C, Tanthapanichakoon W, et al.Removal of heavy metals by adsorbent prepared from pyrolyzed coffee residues and clay[J].Separation&Purification Technology, 2004, 35(1):11-22.
[13]Li C, Zhuang Z, Feng H, et al. Recycling rare earth elements from industrial wastewater with flowerlike nano-Mg(OH):[J]. Acs Appl Mater Interfaces, 2013, 5(19):9 719-9 725.
[14]冯雪冬,马艳飞.氢氧化镁对Cr(Ⅲ)吸附特性研究[J].中国矿业,2009, 18(2):101-104.
[15]谷静维.纳米氢氧化镁的制备及其性能研究[D].郑州:郑州大学,2014.
[16]翟德伟,陈爱民,倪哲明.纳米氢氧化镁合成及用于含铬废水处理的研究[J].科技通报,2007, 23(1):141-145.
[17]姚志通,陆甜,李海晏,等.电气石/H202体系对Cu(Ⅱ)-乙二胺四乙酸废水的降解及反应机理[J].硅酸盐学报,2009, 37(4):543-547.
[18]杨兴华,印春生,任琴,等.人工神经网络用于金属离子-乙二胺四乙酸络合物稳定性研究[J].分析化学,1999, 27(11):1 268-1 273.
[19]胡利珍.制革鞣制及鞣后段化学品对铬沉淀行为的影响研究[D].西安:陕西科技大学,2014.
[20]柴多里,张柠,杨保俊.花瓣状纳米氢氧化镁及氧化镁的微波辅助合成[J].无机盐工业,2011,43(5):40.
[21]Liu M, Zanna S, Ardelean H, et al. A first quantitative XPS study of the surface films formed, by exposure to water, on Mg and on the Mg-Al intermetallics:Al_3Mg_2 and Mg_(17)Al_(12)[J].Corrosion Science, 2009, 51(5):1 115-1 127.
[22]Fiol N, Escudero C, Villaescusa I. Chromium sorption and Cr(Ⅵ)reduction to Cr(Ⅲ)by grape stalks and yohimbe bark.[J]. Bioresour Technol, 2008, 99(11):5 030-5 036.