Chakravarty S, Pimple S, Chaturvedi Hema T, Singh S, Gupta K K
Analytical Chemistry Centre, National Metallurgical Laboratory, Jamshedpur 831007, India.
J Hazard Mater. 2008 Nov 30;159(2-3):396-403. doi: 10.1016/j.jhazmat.2008.02.030. Epub 2008 Feb 17.
Newspaper pulp was found to be a potential adsorbent for removal of copper from aqueous medium. Detail adsorption study of Cu on newspaper pulp was investigated. Batch adsorption study was carried out as a function of contact time, adsorbent dose, temperature (303-323 K). The experimental data was analyzed using Freundlich, Langmuir, Dubinin-Radushkevich (D-R) and Redlich-Peterson (R-P) isotherm models. It was found that Freundlich, Langmuir and R-P models fitted well. pH variation study revealed that the adsorption increased with increase in pH of the solution. Maximum loading capacity was found to be 30 mg g(-1) at 20 mg L(-1) of initial Cu concentration. Adsorption data were analyzed using two kinetic models, Lagergren first order and pseudo second order. It was observed that pseudo second order represented the best correlation. Langmuir isotherm was used to obtain the thermodynamic parameters such as free energy (DeltaG degrees ), enthalpy (DeltaH degrees ) and entropy (DeltaS degrees ) of adsorption. The negative value of free energy and positive value of enthalpy change indicate that the adsorption of Cu on newspaper pulp is a spontaneous process and endothermic. The results of activation energy also confirmed that the adsorption of Cu on newspaper pulp is physical in nature. Present investigation emphasized that newspaper pulp may be utilized as a low cost adsorbent for copper removal.
报纸纸浆被发现是从水介质中去除铜的一种潜在吸附剂。对铜在报纸纸浆上的详细吸附研究进行了调查。进行了批量吸附研究，考察了接触时间、吸附剂用量、温度（303 - 323 K）的影响。实验数据采用弗伦德利希、朗缪尔、杜宾宁 - 拉杜什克维奇（D - R）和雷德利希 - 彼得森（R - P）等温线模型进行分析。发现弗伦德利希、朗缪尔和R - P模型拟合良好。pH变化研究表明，吸附量随溶液pH值的增加而增加。在初始铜浓度为20 mg L(-1)时，最大负载量为30 mg g(-1)。吸附数据采用两种动力学模型进行分析，即 Lagergren一级模型和伪二级模型。观察到伪二级模型具有最佳相关性。使用朗缪尔等温线来获得吸附的热力学参数，如自由能（ΔG°）、焓（ΔH°）和熵（ΔS°）。自由能的负值和焓变的正值表明铜在报纸纸浆上的吸附是一个自发过程且为吸热过程。活化能的结果也证实了铜在报纸纸浆上的吸附本质上是物理吸附。目前的研究强调报纸纸浆可作为一种低成本吸附剂用于去除铜。
