Equilibrium, kinetic and thermodynamic studies on the adsorption of phenol onto chitin
Equilibrium, kinetic and thermodynamic studies on the adsorption of phenol onto chitin
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DOI：
10.1016/j.jhazmat.2005.03.034
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发表时间：
2005-08-31
影响因子：
13.6
通讯作者：
Kalayci, ÇS
中科院分区：
文献类型：
--
作者：
Dursun, AY;Kalayci, ÇS
研究了甲壳素对苯酚的吸附行为，考察了初始pH值、温度和苯酚初始浓度对甲壳素吸附苯酚的影响。在pH 1.0和40 ℃下，对于300 mg dm（-3）的初始苯酚浓度，测定的最高苯酚吸附容量为21.5 mg g（-1）。吸附数据很好地描述了Freundlich模型，虽然它们可以被建模的Langmuir方程。采用准一级和准二级动力学模型对实验数据进行了检验。伪二级动力学模型提供了最好的相关性的实验数据相比，伪一级模型。吸附过程的热力学常数; Δ G度、Δ H度和Δ S度被评估为-19.4 KJ mol（-1）（在40 ° C下，分别为10.2 KJ mol（-1）和0.093 KJ mol（-1）K-1。这说明甲壳素对苯酚的吸附是吸热的、自发的。(c)2005 Elsevier B. V.保留所有权利。
The adsorption of phenol onto chitin, a naturally occurring material was studied as a function of initial pH, temperature and initial phenol concentration. The highest phenol adsorption capacity was determined as 21.5 mg g(-1) for 300 mg dm(-3) initial phenol concentration at pH 1.0 and 40 degrees C. Adsorption data were well described by the Freundlich Model, although they could be modeled by the Langmuir equation. The pseudo-first-order and pseudo-second-order kinetic models were applied to test the experimental data. The pseudo-second-order kinetic model provided the best correlation of the experimental data compared to the pseudo-first-order model. The thermodynamic constants of the adsorption process; Delta G degrees, Delta H degrees and Delta S degrees were evaluated as -19.4 KJ mol(-1) (at 40 degrees C, 10.2 KJ mol(-1) and 0.093 KJ mol(-1) K-1, respectively. These showed that adsorption of phenol on chitin was endothermic and spontaneous. (c) 2005 Elsevier B.V. All rights reserved.