Ozdes Duygu, Gundogdu Ali, Kemer Baris, Duran Celal, Senturk Hasan Basri, Soylak Mustafa
Department of Chemistry, Karadeniz Technical University, Faculty of Arts & Sciences, 61080 Trabzon, Turkey.
J Hazard Mater. 2009 Jul 30;166(2-3):1480-7. doi: 10.1016/j.jhazmat.2008.12.073. Epub 2008 Dec 24.
The objective of this study was to assess the adsorption potential of a waste mud (WM) for the removal of lead (Pb(II)) ions from aqueous solutions. The WM was activated with NaOH in order to increase its adsorption capacity. Adsorption studies were conducted in a batch system as a function of solution pH, contact time, initial Pb(II) concentration, activated-waste mud (a-WM) concentration, temperature, etc. Optimum pH was specified as 4.0. The adsorption kinetic studies indicated that the overall adsorption process was best described by pseudo-second-order kinetics. The equilibrium adsorption capacity of a-WM was obtained by using Langmuir and Freundlich isotherm models and both models fitted well. Adsorption capacity for Pb(II) was found to be 24.4 mg g(-1) for 10 g L(-1) of a-WM concentration. Thermodynamic parameters including the Gibbs free energy (Delta G degrees), enthalpy (Delta H degrees), and entropy (DeltaS degrees) indicated that the adsorption of Pb(II) ions on the a-WM was feasible, spontaneous and endothermic, at temperature range of 0-40 degrees C. Desorption studies were carried out successfully with diluted HCl solutions. The results indicate that a-WM can be used as an effective and no-cost adsorbent for the treatment of industrial wastewaters contaminated with Pb(II) ions.
本研究的目的是评估一种废泥（WM）从水溶液中去除铅（Pb(II)）离子的吸附潜力。用氢氧化钠对废泥进行活化以提高其吸附能力。在间歇系统中进行吸附研究，考察了溶液pH值、接触时间、初始Pb(II)浓度、活化废泥（a-WM）浓度、温度等因素的影响。确定最佳pH值为4.0。吸附动力学研究表明，整个吸附过程用伪二级动力学描述最为合适。采用Langmuir和Freundlich等温线模型获得了a-WM的平衡吸附容量，两种模型拟合效果均良好。对于10 g L(-1)的a-WM浓度，Pb(II)的吸附容量为24.4 mg g(-1)。包括吉布斯自由能（ΔG°）、焓（ΔH°）和熵（ΔS°）在内的热力学参数表明，在0-40℃的温度范围内，Pb(II)离子在a-WM上的吸附是可行的、自发的且吸热的。用稀盐酸溶液成功进行了解吸研究。结果表明，a-WM可作为一种有效且低成本的吸附剂用于处理受Pb(II)离子污染的工业废水。
