Adsorption of basic dye on high-surface-area activated carbon prepared from coconut husk: Equilibrium, kinetic and thermodynamic studies
Adsorption of basic dye on high-surface-area activated carbon prepared from coconut husk: Equilibrium, kinetic and thermodynamic studies
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DOI：
10.1016/j.jhazmat.2007.10.031
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发表时间：
2008-06-15
影响因子：
13.6
通讯作者：
Hameed, B. H.
中科院分区：
文献类型：
--
作者：
Tan, I. A. W.;Ahmad, A. L.;Hameed, B. H.
采用静态吸附法测定了椰壳活性炭对亚甲基蓝的吸附等温线和吸附动力学。研究了接触时间（1- 30 h）、染料初始浓度（50-500 mg/l）和溶液温度（30-50 ℃）的影响。平衡数据拟合Langmuir，Freundlich，Temkin和Dubininin-Radushkevich等温模型。吸附等温线符合Langmuir模型，最大单分子层吸附量为434.78 mg/g。动力学数据拟合伪一级，伪二级和颗粒内扩散模型，并发现密切遵循伪二级动力学模型。热力学参数，如标准焓（Δ H度），标准熵（Δ S度）和标准自由能（Δ G度）进行了评估。吸附相互作用被认为是放热的性质。椰子壳基活性炭是一种很有前途的去除亚甲基蓝的吸附剂。(C)2007 Elsevier B. V.保留所有权利。
Adsorption isotherm and kinetics of methylene blue on activated carbon prepared from coconut husk were determined from batch tests. The effects of contact time (1-30h), initial dye concentration (50-500 mg/l) and solution temperature (30-50 degrees C) were investigated. Equilibrium data were fitted to Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models. The equilibrium data were best represented by Langmuir isotherm model, showing maximum monolayer adsorption capacity of 434.78 mg/g. The kinetic data were fitted to pseudo-first-order, pseudo-second-order and intraparticle diffusion models, and was found to follow closely the pseudo-second-order kinetic model. Thermodynamic parameters such as standard enthalpy (Delta H degrees), standard entropy (Delta S degrees) and standard free energy (Delta G degrees) were evaluated. The adsorption interaction was found to be exothermic in nature. Coconut husk-based activated carbon was shown to be a promising adsorbent for removal of methylene blue from aqueous solutions. (C) 2007 Elsevier B.V. All rights reserved.