Facile preparation of NiFe₂O₄ decorated chitosan-graphene oxide for efficient remediation of Co(II) and adsorption mechanism.

IF 7.7 1区化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY International Journal of Biological Macromolecules Pub Date : 2024-10-04 DOI:10.1016/j.ijbiomac.2024.136289

Ting Guo, Chaoke Bulin

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Abstract

In the background of severe water pollution, adsorption is a charming technique for heavy metal remediation. In this work, NiFe₂O₄ decorated chitosan-graphene oxide (NFCG) was prepared by simple hydrothermal method for Co(II) remediation application. Adsorption mechanism was elaborately elucidated based on multiple evidences extracted from adsorption fitting (isotherms, thermodynamics and kinetics), spectroscopic test (XPS, UV-Vis absorption, fluorescent emission and Raman spectra) and the hard-soft acid-base (HSAB) theory inspection. Result shows, for Co(II) with initial concentration 200 mg·L^-1, NFCG with dosage 500 mg·L^-1 reaches adsorption equilibrium in 24 min, rendering removal percentage and adsorption amount 96.87 % and 387.48 mg·g^-1, respectively. Owing to the efficient recovery enabled by paramagnetism, NFCG keeps adsorption amount 311.01 mg·g^-1 for Co(II) after six consecutive cycles. Moreover, NFCG exhibits selectivity towards Co(II) under the coexistence of common interfering substances. Adsorption fitting suggests chemical adsorption based on heterogeneous affinity. Spectroscopic analysis discloses, CO, CO, -C(=O)NH-, OH and aromatic part contribute to Co(II) adsorption via electron donation, forming CoO bond. This atomic scale adsorption mechanism was substantiated by HSAB theory calculation. In brief, this work provides basic knowledge and technical support for fabricating high efficiency magnetic bio adsorbent.

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简便制备壳聚糖-氧化石墨烯装饰的 NiFe2O4，用于高效修复 Co(II) 及吸附机理。

在水污染严重的背景下，吸附是一种极具魅力的重金属修复技术。本研究采用简单的水热法制备了NiFe2O4装饰壳聚糖-氧化石墨烯（NFCG），用于Co(II)的修复。根据吸附拟合（等温线、热力学和动力学）、光谱测试（XPS、紫外可见吸收、荧光发射和拉曼光谱）和硬-软酸碱（HSAB）理论检验等多种证据，详细阐明了吸附机理。结果表明，对于初始浓度为 200 mg-L-1 的 Co(II)，用量为 500 mg-L-1 的 NFCG 在 24 分钟内达到吸附平衡，去除率和吸附量分别为 96.87 % 和 387.48 mg-g-1。由于顺磁性带来的高效回收，NFCG 在连续六个周期后对 Co(II) 的吸附量仍保持在 311.01 mg-g-1。此外，在常见干扰物质共存的情况下，NFCG 对 Co（II）具有选择性。吸附拟合结果表明，NFCG 具有基于异质亲和力的化学吸附作用。光谱分析显示，CO、CO、-C(=O)NH-、OH 和芳香族部分通过电子捐赠形成 CoO 键，促进了 Co（II）的吸附。这种原子尺度的吸附机理得到了 HSAB 理论计算的证实。总之，这项研究为制造高效磁性生物吸附剂提供了基础知识和技术支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Biological Macromolecules 生物-生化与分子生物学

CiteScore

13.70

自引率

9.80%

发文量

2728

审稿时长

64 days

期刊介绍： The International Journal of Biological Macromolecules is a well-established international journal dedicated to research on the chemical and biological aspects of natural macromolecules. Focusing on proteins, macromolecular carbohydrates, glycoproteins, proteoglycans, lignins, biological poly-acids, and nucleic acids, the journal presents the latest findings in molecular structure, properties, biological activities, interactions, modifications, and functional properties. Papers must offer new and novel insights, encompassing related model systems, structural conformational studies, theoretical developments, and analytical techniques. Each paper is required to primarily focus on at least one named biological macromolecule, reflected in the title, abstract, and text.