Facultad de Ciencias Quìmicas e Ingenierìa, Universidad Autònoma de Baja California, CP 22390, Tijuana, Baja California, Mèxico.
Centro de Graduados e Investigación en Química Instituto Tecnológico de Tijuana, Blvd. Alberto Limón Padilla s/n, Mesa de Otay, CP 22500, Tijuana, B.C., Mexico.
J Hazard Mater. 2017 Aug 5;335:18-27. doi: 10.1016/j.jhazmat.2017.04.020. Epub 2017 Apr 7.
In this paper nonstoichiometric interbiopolyelectrolyte green complexes (NIBPEGCs) were prepared using chitosan (Ch), alginate (AG) and poly(acrylic acid)(PAA). They are proposed as innovative formulations (polyelectrolytes and chelating agents) suitable for the elimination heavy metals contained in wastewater. This application may represent an integral solution for industries rejecting solid and aqueous metallic materials; however, it has not been previously reported. NIBPEGCs physicochemical performance was evaluated based on pH, particle size, surface charge, isoelectric point, dose, coagulation-flocculation kinetics and chemical affinity with seven metal ions. The experimental results showed that NIBPEGCs composed by AG/Ch and PAA/Chitosan have all the three complementary functions: chemical affinity, electrostatic interaction and particle entrapment anticipating more simple operation units to remove heavy metals. Complexes of AG/Ch (negative) were higher performance in removing heavy metals, with a dose window (150-180mg/L), lower dose of 410mg/L PAA/Ch (negative). Investigation of chelating performances of NIBPEGCs show that the efficiency of metal removal is: Ca˃Cr˃Cu˃Pb˃Ni˃Zn˃Cd. Transmittance vs time profiles, metals and zeta potential analysis showed that chelation capacity is the crucial factor to ensure metallic species removal, followed by physical entrapment of the metallic colloids. Integrating all presented results allow to sustain the development of excellent metals removal formulations.
本文采用壳聚糖（Ch）、海藻酸钠（AG）和聚丙烯酸（PAA）制备了非化学计量的双聚电解质绿色配合物（NIBPEGCs）。它们被提议作为适用于去除废水中重金属的创新配方（聚电解质和螯合剂）。这种应用可能代表了拒绝固液金属材料的行业的整体解决方案；然而，目前尚未有相关报道。根据 pH 值、粒径、表面电荷、等电点、剂量、混凝-絮凝动力学以及与七种金属离子的化学亲和力，评估了 NIBPEGCs 的物理化学性能。实验结果表明，由 AG/Ch 和 PAA/壳聚糖组成的 NIBPEGCs 具有三种互补功能：化学亲和力、静电相互作用和颗粒捕获，这预示着去除重金属的操作单元将更加简单。带负电荷的 AG/Ch 复合物在去除重金属方面表现出更高的性能，其剂量窗口（150-180mg/L），而带负电荷的 PAA/Ch 复合物的剂量为 410mg/L。对 NIBPEGCs 的螯合性能的研究表明，金属去除效率为：Ca＞Cr＞Cu＞Pb＞Ni＞Zn＞Cd。透光率随时间的变化曲线、金属和 zeta 电位分析表明，螯合容量是确保去除金属物种的关键因素，其次是金属胶体的物理捕获。综合所有呈现的结果，可以支持开发优秀的金属去除配方。
