吸附剂浓度对Cu(Ⅱ)/IIP-PAA/SiO_2吸附体系的影响
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摘要
采用表面印迹技术合成了铜离子印迹聚烯丙基胺硅胶材料(IIP-PAA/SiO_2),通过静态实验研究了吸附剂浓度W0对Cu(II)离子在IIP-PAA/SiO_2材料上吸附的影响.结果表明,随着W0增加,Cu(Ⅱ)/IIP-PAA/SiO_2体系的吸附等温线下降,吸附体系具有明显的吸附剂浓度效应.实验数据显示吸附剂的平衡吸附量Qe与液相平衡浓度Ce和吸附剂浓度W0之间具有相关性,通过C_e/W_0(液相平衡离子浓度与吸附剂浓度的比值)因子来修正经典Langmuir模型参数,所得的修正Langmuir等温式能描述和预测不同吸附剂浓度W0水平下的平衡吸附量Qe,表明该修正模型具有合理性.
Surface ion-imprinted poly(allylamine)-silica material(IIP-PAA/SiO_2) was synthesized by surface imprinting technique.The effect of sorbent concentration(W_0) on Cu(Ⅱ) adsorption was studied using batch experiments.The results showed that the adsorption system exhibited a significant sorbent concentration effect,and adsorption isotherms declined as W_0 increased.Results obtained from the tests also indicated that the equilibrium adsorption capacity Qewas not a single function of the equilibrium ion concentration Cebut a function of both Ceand W_0.A revised Langmuir model was obtained according to the factor of C_e/W_0.Its applicability was examined,and the result showed that the equilibrium capacities under various particle concentrations could be described well by the revised Langmuir model.
Surface ion-imprinted poly(allylamine)-silica material(IIP-PAA/SiO_2) was synthesized by surface imprinting technique.The effect of sorbent concentration(W_0) on Cu(Ⅱ) adsorption was studied using batch experiments.The results showed that the adsorption system exhibited a significant sorbent concentration effect,and adsorption isotherms declined as W_0 increased.Results obtained from the tests also indicated that the equilibrium adsorption capacity Qewas not a single function of the equilibrium ion concentration Cebut a function of both Ceand W_0.A revised Langmuir model was obtained according to the factor of C_e/W_0.Its applicability was examined,and the result showed that the equilibrium capacities under various particle concentrations could be described well by the revised Langmuir model.
引文
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[2]DITORO D M,MAHONY J D,KIRCHGRABER P R,et al.Effects of nonreversibility,particle concentration,and ionic-strength on heavy-metal sorption[J].Environmental science and technology,1986,20(1):55-61.
[3]PAN G,LISS P S.Metastable equilibrium adsorption theory I Theoretical[J].Journal of colloid and interface science,1998,201(1):71-76.
[4]WU X F,HU Y L,ZHAO F,et al.Ion adsorption components in liquid/solid systems[J].Journal of environmental sciences,2006,18(6):1167-1175.
[5]赵凌曦,宋淑娥,杜娜,等.一个与吸附剂浓度有关的Langmuir等温式[J].物理化学学报,2012,28(12),2905-2910.
[6]EL-NAHHAL I M,EL-ASHGAR N M.A review on polysiloxane-immobilized ligand systems:synthesis,characterization and applications[J].J Organomet Chem,2007,692(14):2861-2886.
[7]HUGHES M A,NIELSEN D,ROSENBERG E,et al.Structural investigations of silica polyamine composites:surface coverage,metal Ion coordination,and ligand modification[J].Ind Eng Chem Res,2006,45(19):6538-6547.
[8]范忠雷,刘海龙,慎金鸽.PAA/Si O2材料对含铜废水吸附性能研究[J].高校化学工程学报,2012,26(4):679-684.
[9]范忠雷,李瑞瑞,王亚辉,等.表面印迹聚烯丙基胺硅胶材料的制备研究[J].化工新型材料,2012,40(8):20-22.
[10]HUGHES M A,ROSENBERG E.Characterization and applications of poly-acetate modified silica polyamine composites[J].Separation science and technology,2007,42:261-283.
[11]范忠雷,王玲慧,慎金鸽.乙二胺硅胶复合材料对Zn2+的吸附特性[J].应用化学,2010,27(11):1260-1263.
[12]徐丛,李薇,潘纲.Zn(II)/a-Fe OOH吸附体系的固体浓度效应[J].物理化学学报,2009,25(9):1737-1742.
[13]FEHSE K U,BORG H,SORKAU E,et al.Correcting the effect of the sorbent to solution ratio on sorption isotherms from batch tests with soils and sediments[J].Water air soil pollut,2010,210(1):211-220.