Poznan University of Technology, Faculty of Chemical Technology, Institute of Chemical Technology and Engineering, Berdychowo 4, PL-60965, Poznan, Poland.
Poznan University of Technology, Faculty of Mechanical Engineering and Management, Institute of Materials Science and Engineering, Jana Pawla II 24, PL-60965, Poznan, Poland.
J Environ Manage. 2017 Dec 15;204(Pt 1):300-310. doi: 10.1016/j.jenvman.2017.08.059. Epub 2017 Sep 9.
A chitin/lignin material with defined physicochemical and morphological properties was used as an effective adsorbent of environmentally toxic metals from model systems. Particularly significant is its use in the neutralization of real industrial wastes. The ions Ni, Cu, Zn and Pb were adsorbed on the functional sorbent, confirming the high sorption capacity of the newly obtained product, primarily due to the presence on its surface of numerous active functional groups from the component biopolymers. The kinetics of the process of ion adsorption from model solution were investigated, and the experimental data were found to fit significantly better to a type 1 pseudo-second-order kinetic model, as confirmed by the high correlation coefficient of 0.999 for adsorption of both nickel(II) copper(II) zinc(II) and lead(II) ions. The experimental data obtained on the basis of adsorption isotherms corresponded to the Langmuir model. The sorption capacity of the chitin/lignin material was measured at 70.41 mg(Ni)/g, 75.70 mg(Cu)/g, 82.41 mg(Zn)/g and 91.74 mg(Pb)/g. Analysis of thermodynamic parameters confirmed the endothermic nature of the process. It was also shown that nitric acid is a very effective desorbing (regenerating) agent, enabling the chitin/lignin material to be reused as an effective sorbent of metal ions. The sorption abilities of the chitin/lignin system with respect to particular metal ions can be ordered in the sequence Ni<Cu<Zn<Pb. Tests were also performed with the adsorption of ions of nickel(II), copper(II), zinc(II) and lead(II) from wastewater obtained from galvanization and battery production plants, confirming the ability of the chitin/lignin sorbent to adsorb harmful ions from real industrial wastes.
一种具有特定物理化学和形态特性的甲壳素/木质素材料被用作模型体系中环境有毒金属的有效吸附剂。其特别重要的用途是用于中和实际工业废物。镍、铜、锌和铅离子被吸附在功能吸附剂上，证实了新获得的产品具有很高的吸附能力，这主要归因于其表面存在许多来自组成生物聚合物的活性官能团。研究了离子从模型溶液中吸附的动力学过程，实验数据非常符合一级伪二级动力学模型，吸附镍（II）、铜（II）、锌（II）和铅（II）离子的相关系数高达 0.999，这得到了证实。根据吸附等温线获得的实验数据符合朗缪尔模型。甲壳素/木质素材料的吸附容量为 70.41mg（Ni）/g、75.70mg（Cu）/g、82.41mg（Zn）/g 和 91.74mg（Pb）/g。热力学参数分析证实了该过程是吸热的。研究还表明，硝酸是一种非常有效的解吸（再生）剂，使得甲壳素/木质素材料能够重复用作金属离子的有效吸附剂。甲壳素/木质素体系对特定金属离子的吸附能力可以按照 Ni<Cu<Zn<Pb 的顺序进行排序。还对从镀锌和电池生产厂获得的废水中镍（II）、铜（II）、锌（II）和铅（II）离子的吸附进行了测试，证实了甲壳素/木质素吸附剂能够从实际工业废水中吸附有害离子。
