Tailoring of a chitosan-based adsorbent with target-specific sites for efficient adsorption-reduction of chromium ion pollutant

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2024-12-15 DOI:10.1016/j.seppur.2024.131055

Ling Peng, Ziyan Hu, Jiejie Cui, Nina Yang, Rui Bao, Yizeng Dai, Qi Wang, Yao Jiang, Peng Cui

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引用次数: 0

Abstract

Chromium (Cr) ion is a serious pollutant in industrial wastewater, and the removal and simultaneous detoxification of Cr(VI) remains a persistent challenge. Here, we present a novel chitosan-based adsorbent, GA/CS-PEI-PVA (GCPP), designed with crosslinked networks and target-specific sites by incorporating polyethyleneimine (PEI), polyvinyl alcohol (PVA), and 3,4,5-trihydroxybenzoic acid (GA) into chitosan. The harvested GCPP demonstrated enhanced thermal stability, mechanical strength, and specific surface area. Remarkably, GCPP achieved a Cr ion adsorption capacity of up to 290.77 mg·g⁻¹ and a reduction ratio of Cr(VI) to Cr(III) of 83.20 %. Mechanism studies revealed that the adsorption of Cr ion on GCPP involved complexation and electrostatic attraction processes, while the grafted phenolic hydroxyl groups significantly promoted the detoxification of Cr(Ⅵ) to Cr(Ⅲ). This study represents a significant advance in the development of efficient adsorbents for the practical treatment of Cr ion-containing pollutants.

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铬（Cr）离子是工业废水中的一种严重污染物，如何去除并同时解毒六价铬（Cr(VI)）仍是一项长期挑战。在此，我们将聚乙烯亚胺（PEI）、聚乙烯醇（PVA）和 3,4,5-三羟基苯甲酸（GA）融入壳聚糖，设计出具有交联网络和目标特异性位点的新型壳聚糖基吸附剂--GA/CS-PEI-PVA（GCPP）。收获的 GCPP 具有更高的热稳定性、机械强度和比表面积。值得注意的是，GCPP 的铬离子吸附容量高达 290.77 mg-g-1，六价铬对三价铬的还原率为 83.20%。机理研究表明，铬离子在 GCPP 上的吸附涉及络合和静电吸引过程，而接枝的酚羟基则显著促进了铬(Ⅵ)向铬(Ⅲ)的解毒。这项研究在开发高效吸附剂用于实际处理含铬离子污染物方面取得了重大进展。

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

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.