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首页> 外文期刊>World review of science, technology and sustainable development >Equilibrium studies, kinetics and thermodynamics of anion removal by adsorption
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Equilibrium studies, kinetics and thermodynamics of anion removal by adsorption

机译：吸附去除阴离子的平衡研究，动力学和热力学

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摘要

In this work, granular activated carbon (GAC) functionalised with CaCl_2 was used to remove nitrate and sulphate from aqueous solutions. Functionalisation with CaCl_2 influenced the physico-chemical properties and improved the adsorption capacity of activated carbon. The effect of pH on adsorption was investigated, and no significant difference was observed. The adsorption process was found to be of an exothermic nature. Thermodynamic parameters were calculated including the change in Gibbs free energy (△G°), enthalpy (△H°) and entropy (△S°). The pseudo-first-order model, pseudo-second-order model and Elovich equation were used to study the adsorption kinetics. The intraparticle diffusion model, Boyd's model and Bangham's equation were investigated to determine the mechanism of this process. The data showed that nitrate adsorption on activated carbon follows second-order kinetics, whereas that of sulphate follows first-order kinetics. The control mechanism for the two components was determined to be particle diffusion.
机译：在这项工作中，使用CaCl_2功能化的颗粒状活性炭（GAC）从水溶液中去除硝酸盐和硫酸盐。 CaCl_2的官能化影响了理化性质并提高了活性炭的吸附能力。研究了pH对吸附的影响，没有观察到显着差异。发现吸附过程具有放热性质。计算热力学参数，包括吉布斯自由能（△G°），焓（△H°）和熵（△S°）的变化。用拟一阶模型，拟二阶模型和Elovich方程研究吸附动力学。研究了颗粒内扩散模型，Boyd模型和Bangham方程以确定该过程的机理。数据表明，硝酸盐在活性炭上的吸附遵循二级动力学，而硫酸盐的吸附则遵循一级动力学。确定这两个组件的控制机制是粒子扩散。

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  • 作者

    Odivan Zanella; Elen Klein; Nathalia K. Haro; Manuela G. Cardoso; Isabel C. Tessaro; Liliana A. Feris;

  • 作者单位

    Laboratory of Separation and Unit Operations,Department of Chemical Engineering,Federal University of Rio Grande do Sul (UFRGS),Engineer Luis Englert Street, Central Campus,Postcode: 90040-040, Porto Alegre, RS, Brazil;

    Laboratory of Separation and Unit Operations,Department of Chemical Engineering,Federal University of Rio Grande do Sul (UFRGS),Engineer Luis Englert Street, Central Campus,Postcode: 90040-040, Porto Alegre, RS, Brazil;

    Laboratory of Separation and Unit Operations,Department of Chemical Engineering,Federal University of Rio Grande do Sul (UFRGS),Engineer Luis Englert Street, Central Campus,Postcode: 90040-040, Porto Alegre, RS, Brazil;

    Laboratory of Separation and Unit Operations,Department of Chemical Engineering,Federal University of Rio Grande do Sul (UFRGS),Engineer Luis Englert Street, Central Campus,Postcode: 90040-040, Porto Alegre, RS, Brazil;

    Laboratory of Membrane Separation Processes,Department of Chemical Engineering,Federal University of Rio Grande do Sul (UFRGS),Engineer Luis Englert Street, Central Campus,Postcode: 90040-040, Porto Alegre, RS, Brazil;

    Laboratory of Separation and Unit Operations,Department of Chemical Engineering,Federal University of Rio Grande do Sul (UFRGS),Engineer Luis Englert Street, Central Campus,Postcode: 90040-040, Porto Alegre, RS, Brazil;

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  • 正文语种 eng
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  • 关键词

    kinetics; mechanism; adsorption; activated carbon; isotherms;

    机译：动力学;机制;吸附活性炭;等温线;

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