柠檬酸-壳聚糖变体树脂从模拟采矿和农业废水系统中去除铅、铁和锌的循环吸附和解吸特性

IF 4.7 3区 工程技术 Q2 ENGINEERING, ENVIRONMENTAL Journal of Polymers and the Environment Pub Date : 2024-07-01 DOI:10.1007/s10924-024-03343-0
Prabhat Kumar Patel, Lalit Mohan Pandey, Ramagopal V.S. Uppaluri
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引用次数: 0

摘要

用于现实世界中重金属吸附分离的目标吸附剂应具有高吸附能力、可重复使用性和成本效益。本研究合成了一种新型复合吸附剂,用于同时缓解合成废水系统中的铁、铅和锌金属离子。为此,我们采用了具有不同分子量(低、中、高)、羟基和胺官能团的壳聚糖作为基质。利用戊二醛交联剂成功锚定了有机化合物柠檬酸。经评估,中等分子量壳聚糖-柠檬酸(中等柠檬酸-CS)对锌、铅和铁的最佳金属吸附量分别为 243.90、3.93 和 144.93 mg g-1。因此,可以确定吸附剂体系中的其他替代离子会显著改变吸附模式。通过观察吸附模式的一致性以及通过伪二阶(PSO)方法成功建模,有效地验证了化学吸附过程。随后,在使用简单的碱性和酸性洗脱液以及基于三周期的同步再生时,金属离子的解吸都很有效。总之,研究结果表明,该吸附剂在从复杂溶液中去除金属离子方面具有良好的性能。
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Cyclic Adsorption and Desorption Characteristics of Citric Acid-chitosan Variant Resins for Pb, Fe, and Zn Removal from Simulated Mining and Agricultural Wastewater System

Targeted sorbents for the real-world adsorptive separation of heavy metals shall exhibit high sorption capacity, reusability, and cost-effectiveness. In this study, a novel composite sorbent has been synthesized for the concurrent mitigation of iron, lead, and zinc metal ions from synthetic wastewater systems. For this purpose, chitosan with alternate molecular weight (low, medium, and high) and with hydroxyl and amine functional groups was employed as a substrate. The successful anchoring of the organic compound citric acid was achieved with the glutaraldehyde crosslinker. The medium molecular weight chitosan-citric acid (medium Cit-CS) has been evaluated to achieve optimal metal uptake of 243.90, 3.93, and 144.93 mg g−1 for zinc, lead, and iron from intricate Zn dominant adsorbate system. Accordingly, it was ascertained that other alternative ions in the adsorbate system significantly alter the sorption patterns. The validation of the chemisorption process was effectively established through the consistency observed in the pattern of adsorption as well as the successful modeling via the pseudo-second-order (PSO) approach. Following this, the desorption of metal ions was effective with simple basic and acidic eluents and for a three-cycle-based simultaneous regeneration. In summary, the findings demonstrate the promising performance of the sorbent for metal ions eradication from intricate solutions.

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来源期刊
Journal of Polymers and the Environment
Journal of Polymers and the Environment 工程技术-高分子科学
CiteScore
9.50
自引率
7.50%
发文量
297
审稿时长
9 months
期刊介绍: The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.
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