Adsorption of congo red onto activated carbons having different surface properties: studies of kinetics and adsorption equilibrium
Adsorption of congo red onto activated carbons having different surface properties: studies of kinetics and adsorption equilibrium
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DOI：
10.1080/19443994.2012.661263
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发表时间：
2012-01
影响因子：
1.1
通讯作者：
M. Belhachemi;F. Addoun
中科院分区：
文献类型：
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作者：
M. Belhachemi;F. Addoun
摘要为了提高水溶液中刚果红（CR）的去除率，以枣核为原料制备活性炭，经硝酸氧化改性后，在氮气保护下进行热处理。从水溶液中的CR的动力学和平衡吸附数据进行了研究，表明通过热处理从活性炭上除去氧表面基团提高了吸附容量。吸附符合准二级动力学。实验等温线进行了分析与两个和三个参数方程（Freundlich，朗缪尔，Redlich-Peterson），使用非线性回归。结果表明，Langmuir和Redlich-Peterson吸附等温线与平衡数据拟合较好，由Langmuir方程计算出的最大吸附量为105 mg/g。该染料在活性炭上的吸附机理涉及静电相互作用和色散相互作用。
Abstract To enhance congo red (CR) removal from aqueous solution, activated carbons prepared from date pits and modified by oxidation with nitric acid followed by heat treatment in a nitrogen atmosphere were tested. Kinetic and equilibrium adsorptions data of CR from aqueous solution were carried out, showing that the elimination of oxygen surface groups from activated carbon by heat treatment enhanced the adsorption capacity. The adsorption followed pseudosecond order kinetics. The experimental isotherms were analysed with two and three parameters equations (Freundlich, Langmuir, and Redlich–Peterson) using non-linear regression. The results showed that the Langmuir and Redlich–Peterson isotherms best-fit the equilibrium data, with maximum adsorption capacity of 105 mg/g calculated from Langmuir equation. The mechanism adsorption of this anionic dye on activated carbons involved electrostatic and dispersive interactions.