改性蒙脱石的电动性质及吸附直接大红染料性能
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摘要
采用多种化合物插层蒙脱石,制备不同电动电位(ζ-电位)的蒙脱石,用于吸附水体中的直接大红染料,并研究蒙脱石的ζ-电位与吸附直接大红染液的性能关系.研究表明:蒙脱石的ζ-电位对吸附染料性能有显著的影响,Ni~(2+)与邻菲罗啉生成的螯合物改性蒙脱石及聚合羟基铝离子改性蒙脱石对染料的吸附性较好,脱色率可达90%以上,且前者对染料的吸附性基本与pH值无关.动力学研究表明:聚合羟基铝离子改性蒙脱石吸附染料较快,液膜扩散是主要的控速步骤,可用准一级动力学描述;而Ni~(2+)与邻菲罗啉生成的螯合物改性蒙脱石吸附染料较慢,粒内扩散限速作用大,更接近准二级动力学模型.热力学研究表明:聚合羟基铝离子改性蒙脱石和Ni~(2+)与邻菲罗啉生成的螯合物改性蒙脱石的吸附过程分别适合于Langmuir模型和Freumdlich模型,两者的吸附能力均约为22mg·g~(-1).
Various compounds were used to alter montmorillonite,to prepare modified montmorillonites with different zeta-potentials(ζ-potential)as adsorbents for removal of the direct red dye from the aqueous solution.The impact of theζ-potential of montmorillonite on the adsorption capacity toward dye was investigated.The results showed that the values of ζ-potential have a prominent effect on its adsorptive affinity for dye.The modified montmorillonites,such as Al_(13)-M and Ni-phen-M,showed higher decoloring performance with the decolorization rate over 90%.The adsorption of dye on Ni-phen-M was pH value independent.Futhermore,the kinetics of the interactions for Al_(13)-M toward dye was best described by pseudo-first-order mechanism,but Ni-phen-M followed the pseudo-second-order model.It was also found that the rate-limiting step of Al_(13)-M was more likely to be liquid film diffusion as compared to Ni-phen-M,of which the rate-limiting step was intraparticle diffusion.Thermodynamic studies showed that the adsorption of Al_(13)-M and Ni-phen-M were well described by Langmuir and Freumdlich isotherm model,respectively.The adsorption capacity of both were about 22mg·g~(-1).
Various compounds were used to alter montmorillonite,to prepare modified montmorillonites with different zeta-potentials(ζ-potential)as adsorbents for removal of the direct red dye from the aqueous solution.The impact of theζ-potential of montmorillonite on the adsorption capacity toward dye was investigated.The results showed that the values of ζ-potential have a prominent effect on its adsorptive affinity for dye.The modified montmorillonites,such as Al_(13)-M and Ni-phen-M,showed higher decoloring performance with the decolorization rate over 90%.The adsorption of dye on Ni-phen-M was pH value independent.Futhermore,the kinetics of the interactions for Al_(13)-M toward dye was best described by pseudo-first-order mechanism,but Ni-phen-M followed the pseudo-second-order model.It was also found that the rate-limiting step of Al_(13)-M was more likely to be liquid film diffusion as compared to Ni-phen-M,of which the rate-limiting step was intraparticle diffusion.Thermodynamic studies showed that the adsorption of Al_(13)-M and Ni-phen-M were well described by Langmuir and Freumdlich isotherm model,respectively.The adsorption capacity of both were about 22mg·g~(-1).
引文
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[3]DU Huihui,CHEN Wenli,CAI Peng,et al.Competitive adsorption of Pb and Cd on bacteria-montmorillonite composite[J].Environmental Pollution,2016,218(11):168-175.DOI:10.1016/j.envpol.2016.08.022.
[4]ADDY M,LOSEY B,MOHSENI R,et al.Adsorption of heavy metal ions on mesoporous silica-modified montmorillonite containing agrafted chelate ligand[J].Applied Clay Science,2012,59/60(5):115-120.DOI:10.1016/j.clay.2012.02.012.
[5]WANG Guifang,HUA Yuyan,SU Xin,et al.Cr(VI)adsorption by montmorillonite nanocomposites[J].Applied Clay Science,2016,124/125(5):111-118.DOI:10.1016/j.clay.2016.02.008.
[6]MARKIEWICZ M,MROZIK W,REZWAN K,et al.Changes in zeta potential of imidazolium ionic liquids modified minerals:Implications for determining mechanism of adsorption[J].Chemosphere,2013,90(2):706-712.DOI:10.1016/j.chemosphere.2012.09.053.
[7]ZADAKA D,RADIAN A,MISHAEL Y G.Applying zeta potential measurements to characterize the adsorption on montmorillonite of organic cations as monomers,micelles,or polymers[J].Journal of Colloid and Interface Science,2010,352(1):171-177.DOI:10.1016/j.jcis.2010.08.010.
[8]YANG Jie,YU Kai,LIU Cun.Chromium immobilization in soil using quaternary ammonium cations modified montmorillonite:Characterization and mechanism[J].Journal of Hazardous Materials,2017,321(5):73-80.DOI:10.1016/j.jhazmat.2016.09.003.
[9]FERREIRO E A,De BUSSETTI S G.Apparent and partial specific adsorption of 1,10-phenanthroline on mixtures of Ca-montmorillonite,activated carbon,and silica gel[J].Journal of Colloid and Interface Science,2005,292(1):54-62.DOI:10.1016/j.jcis.2005.05.050.
[10]CHANGCHAIVONG S,KHAODHIARB S.Adsorption of naphthalene and phenanthrene on dodecylpyri diniummodified bentonite[J].Applied Clay Science,2009,43(3/4):317-321.DOI:10.1016/j.clay.2008.09.012.
[11]IJAGBEMI C O,BAEK M H,KIM D S.Adsorptive performance of un-calcined sodium exchanged and acid modified montmorillonite for Ni 2+removal:Equilibrium,kinetics,thermodynamics and regereration studies[J].Journal of Hazardous Materials,2010,174(3):746-755.DOI:10.1016/j.jhazmat.2009.09.115.
[12]BHATTACHARYYA K G,GUPTA S S.Influence of acid activation on adsorption of Ni(Ⅱ)and Cu(Ⅱ)on Kaolinite and montmorillonite:Kinetic and thermodynamic study[J].Chemical Engineering Journal,2008,136(2):1-13.DOI:10.1016/j.cej.2007.03.005.
[13]WU Xilin,ZHAO Donglin,YANG Shitong.Impact of solution chemistry conditions on the sorption behavior of Cu(Ⅱ)on Lin′an montmorillonite[J].Desalination,2011,269(1/2/3):84-91.DOI:10.1016/j.desal.2010.10.046.
[14]SONDI I,BISCAN J,PRAVDIC V.Electrokinetics of pure clay minerals revisited[J].Journal of Colloid and Interface Science,1996,178(2):514-522.DOI:10.1006/jcis.1996.0146.
[15]HUANG Fuchuang,LEE J F,LEE C K,et al.Effects of cation exchange on the pore and surface structure and adsorption characteristics of montmorillonite[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2004,239(1/2/3):41-47.DOI:10.1016/j.colsurfa.2003.10.030.
[16]ELSHERBINY A S.Adsorption kinetics and mechanism of acid dye onto montmorillonite from aqueous solutions:Stopped-flow measurements[J].Applied Clay Science,2013,83/84(10):56-62.DOI:10.1016/j.clay.2013.07.014.
[17]HU Bingjie,LUO Hanjin.Adsorption of hexavalent chromium onto montmorillonite modified with hydroxyaluminum and cetyltrimethy-lammonium bromide[J].Applied Surface Science,2010,257(3):769-775.DOI:10.1016/j.apsusc.2010.07.062.
[18]WANG Guifang,SU Xin,HUA Yuyan,et al.Kinetics and thermodynamic analysis of the adsorption of hydroxy-Al cations by montmorillonite[J].Applied Clay Science,2016,129(8):79-87.DOI:10.1016/j.clay.2016.04.023.
[19]YANG Xiaohong,WEI Shiyong,FANG Dun,et al.Hydroxyiron polymers-montmorillonite:Preparation,characterization and adsorption characteristics for selenate[J].Chinese of Inorganic Chemistry,2014,30(12):2863-2871.DOI:10.11862/CJIC.2014.385.
[20]TONG Dongshen,ZHOU Chunhui,LU Yan,et al.Adsorption of acid red G dye on octadecyl trimethylammonium montm-orillonite[J].Applied Clay Science,2010,50(3):427-431.DOI:10.1016/j.clay.2010.08.018.