Investigation of individual and competitive adsorption of Cu(II), Cd(II), and Pb(II) on montmorillonite in terms of surface complexation and kinetic properties of Cu(II) adsorption

Hizal Julide; Demircivi Pelin; Karadirek Seyda; Apak Resat

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Investigation of individual and competitive adsorption of Cu(II), Cd(II), and Pb(II) on montmorillonite in terms of surface complexation and kinetic properties of Cu(II) adsorption

机译：从表面络合和Cu（II）吸附动力学方面研究蒙脱石上Cu（II），Cd（II）和Pb（II）的单个竞争吸附

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In this study, individual and competitive Cu(II), Cd(II), and Pb(II) adsorptions on montmorillonite were searched by considering surface acidic functional groups of adsorbent. pH dependency of adsorptions and kinetic properties of Cu(II) adsorption was investigated. Cu(II) adsorption on montmorillonite fits pseudo-first-order reaction with the 0.008k value. Individual and competitive heavy metal adsorptions were modeled using Langmuir, Freundlich, Temkin, and Dubinin-Astakhov isotherms. Adsorption capacities were calculated using equations of related linearized models. The adsorption capacities of individual metal adsorption, obtained from linearized models, are higher than the yielded capacities from competitive adsorption experiments. All adsorption energies calculated from linearized Dubinin-Astakhov model varied between 7 and 16kJ/mol. The values of adsorption energies gained for metal adsorption in competition did not significantly differ from those of individual adsorption. Since montmorillonite surface behaves as a weak acid and has a strong buffer effect at pH values between 2 and 3, the pH dependency of adsorption was explained by taking into account the surface acidic properties of adsorbent and introduced preferred surface sites beyond adsorption with increasing pH. Cu(II), Cd(II), and Pb(II) existence on loaded montmorillonite was proved by the aid of SEM-EDX results.

机译：在这项研究中，通过考虑吸附剂的表面酸性官能团，研究了单个和竞争性的Cu（II），Cd（II）和Pb（II）在蒙脱石上的吸附。研究了吸附的pH依赖性和Cu（II）吸附的动力学性质。蒙脱石上的Cu（II）吸附符合0.008k的拟一级反应。使用Langmuir，Freundlich，Temkin和Dubinin-Astakhov等温线对单个和竞争性重金属吸附进行建模。使用相关的线性化模型的方程计算吸附容量。从线性化模型获得的单个金属吸附的吸附容量高于竞争性吸附实验产生的容量。根据线性化的Dubinin-Astakhov模型计算得出的所有吸附能在7至16kJ / mol之间变化。在竞争中，金属吸附获得的吸附能值与单个吸附没有明显差异。由于蒙脱土表面表现为弱酸并且在pH值介于2和3之间时具有很强的缓冲作用，因此通过考虑吸附剂的表面酸性来解释吸附的pH依赖性，并引入随pH值增加而超出吸附范围的优选表面部位。借助于SEM-EDX结果证明了负载的蒙脱石上存在Cu（II），Cd（II）和Pb（II）。

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《Desalination and water treatment》 |2016年第47期|22441-22453|共13页
作者
Hizal Julide; Demircivi Pelin; Karadirek Seyda; Apak Resat;
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作者单位

Yalova Univ, Dept Chem & Proc Engn, Fac Engn, TR-77100 Yalova, Turkey;

Yalova Univ, Dept Chem & Proc Engn, Fac Engn, TR-77100 Yalova, Turkey;

Yalova Univ, Dept Chem & Proc Engn, Fac Engn, TR-77100 Yalova, Turkey;

Istanbul Univ, Dept Chem, Fac Engn, TR-34320 Istanbul, Turkey;

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正文语种 eng
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关键词
Heavy metal; Montmorillonite; Adsorption; Competitive Langmuir model; Surface complexation;

机译：重金属蒙脱土吸附竞争朗缪尔模型表面络合;

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Investigation of individual and competitive adsorption of Cu(II), Cd(II), and Pb(II) on montmorillonite in terms of surface complexation and kinetic properties of Cu(II) adsorption

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