Effect of the pH in the adsorption and in the immersion enthalpy of monohydroxylated phenols from aqueous solutions on activated carbons
Effect of the pH in the adsorption and in the immersion enthalpy of monohydroxylated phenols from aqueous solutions on activated carbons
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DOI：
10.1016/j.jhazmat.2009.03.099
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发表时间：
2009-09-30
影响因子：
13.6
通讯作者：
Moreno-Pirajan, J. C.
中科院分区：
文献类型：
--
作者：
Blanco-Martinez, D. A.;Giraldo, L.;Moreno-Pirajan, J. C.
为了评价活性炭化学表面对单羟基酚吸附的影响，在H2气流中对活性炭Carbochem（TM）- PS230进行了化学和热处理。通过分析298 K、pH 7、9和11下48 h的吸附等温线来确定固-溶液相互作用。活性炭的吸附容量随溶液pH值的降低而增大。在最大吸附pH下，还原碳的吸附量增加，氧化碳的吸附量减少。在颗粒活性炭（CAG）样品中，在三种pH值下，对单羟基酚的吸附量依次为邻苯二酚>对苯二酚>间苯二酚。用Freundlich和Langmuir模型对实验数据进行了评价，确定了浸没传质系数，其值随截留量的增加而增加，在21.5 ~ 45.7J·g ~（-1）之间。此外，浸渍法制备的活性炭与总酸度较低的还原活性炭的相互作用更强。(C)2009爱思唯尔有限公司版权所有。
An activated carbon Carbochem (TM) - PS230 was modified by chemical and thermal treatment in flow of H-2 in order to evaluate the influence of the activated carbon chemical surface in the adsorption of the monohydroxylated phenols. The solid-solution interaction was determined by analyzing the adsorption isotherms at 298 K at pH 7, 9 and 11 during 48 h. The adsorption capacity of activated carbons increases when the pH solution decreases. The amount adsorbed increases in the reduced carbon at the maximum adsorption pH and decreases in the oxidized carbon. in the sample of granulated activated carbon, CAG, the rnonohydroxylated phenols adsorption capacity diminishes in the following order catechol > hydroquinone > resorcinol, at the three pH values. The experimental data are evaluated with Freundlich's and Langmuir's models.The immersion enthalpies are determined and increase with the retained amount, ranging between 21.5 and 45.7 J g(-1). In addition, the immersion enthalpies show more interaction with the reduced activated carbon that has lower total acidity contents. (C) 2009 Elsevier B.V. All rights reserved.