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Phenoxyacid pesticide adsorption on activated carbon — Equilibrium and kinetics

机译：活性炭上苯氧酸农药的吸附—平衡和动力学

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The adsorption of herbicides belonging to the group of halogenated phenoxyacids on the activated carbon was studied. They are differentiated in terms of quantity and type of functional groups (such as chloride, bromide, fluoride) and their position on an aromatic ring. The experimental equilibrium data were analyzed using adsorption isotherm equations taking into account energetic heterogeneity of the adsorption systems. The calculated concentration profiles from the kinetic data were discussed applying two diffusion models, MOE, f-MOE and multi-exponential equations. The dependences between the properties of adsorbates, adsorption uptake and rate were analyzed. The adsorption affinity of pesticides was correlated with adsorbate hydrophobicity, character of functional group, molecular structure. The applicability of kinetic models and equations was investigated; the assumptions of the models were analyzed with regard to consistency with adsorption mechanism. Similarity of adsorption mechanism was found for all adsorbates confirmed by similarity of kinetic curves and corresponding distributions of rate coefficients. The differences in kinetic profiles were attributed to differentiation of herbicide's molecules - number and type of functional groups and their positions on aromatic ring. (C) 2018 Elsevier Ltd. All rights reserved.
机译：研究了除草剂在活性炭上的吸附情况，该除草剂属于卤化苯氧基酸类。它们在官能团（例如氯，溴，氟）的数量和类型以及它们在芳环上的位置方面有所区别。考虑到吸附系统的高能非均质性，使用吸附等温线方程分析了实验平衡数据。讨论了使用两个扩散模型MOE，f-MOE和多指数方程式从动力学数据计算出的浓度曲线。分析了吸附物性质，吸附量和吸附速率之间的关系。农药的吸附亲和力与被吸附物的疏水性，官能团特性，分子结构有关。研究了动力学模型和方程的适用性；分析模型的假设与吸附机理的一致性。通过动力学曲线的相似性和速率系数的相应分布证实了所有吸附物的吸附机理相似。动力学曲线的差异归因于除草剂分子的分化-官能团的数量和类型以及它们在芳香环上的位置。 （C）2018 Elsevier Ltd.保留所有权利。

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