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首页> 外文期刊>Journal of Applied Polymer Science >Equilibrium, kinetics, and thermodynamics of Pd(II) adsorption onto poly(m-aminobenzoic acid) chelating polymer
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Equilibrium, kinetics, and thermodynamics of Pd(II) adsorption onto poly(m-aminobenzoic acid) chelating polymer

机译：Pd（II）吸附到聚（间氨基苯甲酸）螯合聚合物上的平衡，动力学和热力学

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摘要

This study describes the equilibrium, kinetics, and thermodynamics of the palladium(II) (Pd(II)) adsorption onto poly(m-aminobenzoic acid) (p-mABA) chelating polymer. The p-mABA was synthesized by the oxidation reaction of m-aminobenzoic acid monomer with ammonium peroxydisulfate (APS). The synthesized p-mABA chelating polymer was characterized by FTIR spectroscopy, gel permeation chromatography (GPC), thermal analysis, potentiometric titration, and scanning electron microscopy (SEM) analysis methods. The effects of the acidity, temperature, and initial Pd(II) concentration on the adsorption were examined by using batch adsorption technique. The optimum acidity for the Pd(II) adsorption was determined as pH 2. In the equilibrium studies, it was found that the Pd(II) adsorption capacity of the polymer was to be 24.21 mg/g and the adsorption data fitted better to the Langmuir isotherm than the Freundlich isotherm. The kinetics of the adsorption fitted to pseudo-second-order kinetic model. In the thermodynamic evaluation of the adsorption, the G degrees values were calculated as -16.98 and -22.26 kJ/mol at 25-55 degrees C temperatures. The enthalpy (H degrees), entropy (S degrees), and the activation energy (E-a) were found as 35.40 kJ/mol, 176.05 J/mol K, and 61.71 kJ/mol, respectively. The adsorption of Pd(II) ions onto p-mABA was a spontaneous, endothermic, and chemical adsorption process which is governed by both ionic interaction and chelating mechanisms. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42533.
机译：这项研究描述了钯（II）（Pd（II））吸附到聚（间氨基苯甲酸）（p-mABA）螯合聚合物上的平衡，动力学和热力学。通过间氨基苯甲酸单体与过氧二硫酸铵（APS）的氧化反应合成了p-mABA。通过FTIR光谱，凝胶渗透色谱（GPC），热分析，电位滴定和扫描电子显微镜（SEM）分析方法对合成的p-mABA螯合聚合物进行了表征。使用分批吸附技术检查了酸度，温度和初始Pd（II）浓度对吸附的影响。确定Pd（II）吸附的最佳酸度为pH2。在平衡研究中，发现聚合物对Pd（II）的吸附容量为24.21 mg / g，吸附数据更适合Langmuir等温线比Freundlich等温线。吸附动力学符合拟二级动力学模型。在吸附的热力学评价中，在25-55℃的温度下，G度值被计算为-16.98和-22.26kJ / mol。焓（H度），熵（S度）和活化能（E-a）分别为35.40 kJ / mol，176.05 J / mol K和61.71 kJ / mol。 Pd（II）离子在p-mABA上的吸附是自发的，吸热的和化学吸附过程，受离子相互作用和螯合机理的控制。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，42533。

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