Recovery of Heavy Metal Ions Using Magnetic Glycine-Modified Chitosan—Application to Aqueous Solutions and Tailing Leachate
Source abstract
Abstract
The necessity of decontaminating effluents for the dual purpose of environmental beneficiation and valorization of low-grade resources is driving the development of new sorbents. The functionalization of biopolymers is a promising strategy for improving sorption performance. Incorporating magnetic micro-particles offers an opportunity for the facilitated recovery of spent micron-size sorbent. Combining magnetic facilities and biopolymer functionalization represents a winning strategy. Magnetic glycine-grafted chitosan (G@MChs) was synthesized for the sorption of Ni(II), Zn(II), and Hg(II) before being applied to the removal of hazardous and strategic metals from tailing leachates. The sorbent was characterized using Fourier transform infrared spectroscopy and scanning electron microscopy, before and after metal sorption. The acid–base properties of functionalized sorbent were also determined (pHPZC). Uptake kinetics were studied in mono- and multi-component solutions using different equations for kinetic modeling at optimized pH (i.e., pH0: 5.5). Langmuir and Sips equations were applied to model sorption isotherms in single-component solutions. In addition, sorption isotherms in multi-component solutions were used to evaluate the preference for selected metals. Maximum sorption capacities were 0.35 mmol Hg g−1, 0.47 mmol Zn g−1, and 0.50 mmol Ni g−1. Acidified urea solution (pH 2.7) successfully desorbs metal ions from G@MChs (desorption > 90%). The sorbent was tested for the recovery of hazardous and strategic metal ions from acidic leachates of tailings. This study demonstrates the promising performance of G@MChs for the treatment of complex metal-bearing solutions.
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Research context
OpenAlex topics: Adsorption and biosorption for pollutant removal · Extraction and Separation Processes · Analytical chemistry methods development
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Laboratoire de Génie Chimique et de Catalyse Hétérogène, Université de Sciences et de la Technologie—Mohamed Boudiaf, BP 1505 El-M’Nouer, Oran 31000, Algeria
Laboratoire d’Ingénierie des procédés de l’Environnement (LIPE)—Université des Sciences et Technologie d’Oran—Mohamed Boudiaf, BP 1505 El-M’Nouer, Oran 31000, Algeria
Department of Chemistry, College of Science, University of Jeddah, Jeddah 80327, Saudi Arabia
Environmental Science Department, Faculty of Science, Port-Said University, Port Said 42522, Egypt
Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
Nuclear Materials Authority, El-Maadi, Cairo P.O. Box 530, Egypt
Polymers Composites and Hybrids (PCH), IMT Mines Ales, F-30319 Alès, France
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