Easily recyclable magnetic polyacrylamide/sodium alginate/Fe3O4@ZIF-8 hydrogel beads for effective removal of Congo Red

IF 2.6 4区化学 Q3 POLYMER SCIENCE Journal of Polymer Research Pub Date : 2024-11-27 DOI:10.1007/s10965-024-04195-x

Shuqi Li, Yaodong Liang, Qing Li, Yongjun He

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Abstract

Direct discharge of Congo red (CR) dye wastewater can cause environmental pollution. Herein, magnetic polyacrylamide/sodium alginate/Fe₃O₄@ZIF-8 (PAM/SA/Fe₃O₄@ZIF-8) hydrogel beads with semi-interpenetrating polymer network (SIPN) structure were prepared by combining the properties of PAM/SA hydrogel and Fe₃O₄@ZIF-8 for removal of CR. The magnetic hydrogel beads were characterized by SEM, EDS, FTIR, XRD, and BET. The effect of different factors on the adsorption of CR by magnetic hydrogel beads was investigated. The results showed that the addition of Fe₃O₄@ZIF-8 improved the adsorption capacity of PAM/SA hydrogel beads and the maximum adsorption amount of CR by magnetic PAM/SA/Fe₃O₄@ZIF-8-8 was 234.69 mg g⁻¹. The adsorption of CR on PAM/SA/Fe₃O₄@ZIF-8-8 complied with the Pseudo-second-order kinetic model and Freundlich model. Thermodynamic analyses indicated that the adsorption process was endothermic and spontaneous. The adsorption mechanism of PAM/SA/Fe₃O₄@ZIF-8 on CR was based on electrostatic attraction, metal coordination, hydrogen bonding, and π-π stacking. PAM/SA/Fe₃O₄@ZIF-8-8 had excellent selective adsorption and cyclic regeneration performance for CR removal. This study showed that magnetic PAM/SA/Fe₃O₄@ZIF-8 hydrogel beads can be used as a new effective adsorbent for the recovery of CR in wastewater.

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易于回收的聚丙烯酰胺/海藻酸钠/Fe3O4@ZIF-8 水凝胶磁珠可有效去除刚果红

直接排放刚果红（CR）染料废水会造成环境污染。本文结合聚丙烯酰胺/海藻酸钠/Fe3O4@ZIF-8（PAM/SA/Fe3O4@ZIF-8）水凝胶和 Fe3O4@ZIF-8 的特性，制备了具有半互穿聚合物网络（SIPN）结构的磁性聚丙烯酰胺/海藻酸钠/Fe3O4@ZIF-8 水凝胶珠，用于去除刚果红。对磁性水凝胶珠进行了 SEM、EDS、FTIR、XRD 和 BET 表征。研究了不同因素对磁性水凝胶珠吸附 CR 的影响。结果表明，Fe3O4@ZIF-8 的加入提高了 PAM/SA 水凝胶珠的吸附能力，磁性 PAM/SA/Fe3O4@ZIF-8-8 对 CR 的最大吸附量为 234.69 mg g-1。PAM/SA/Fe3O4@ZIF-8-8对CR的吸附符合伪二阶动力学模型和Freundlich模型。热力学分析表明，吸附过程是内热和自发的。PAM/SA/Fe3O4@ZIF-8 在 CR 上的吸附机理基于静电吸引、金属配位、氢键和 π-π 堆积。PAM/SA/Fe3O4@ZIF-8-8对CR具有优异的选择性吸附和循环再生去除性能。该研究表明，磁性 PAM/SA/Fe3O4@ZIF-8 水凝胶珠可用作回收废水中 CR 的新型有效吸附剂。

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来源期刊

Journal of Polymer Research 化学-高分子科学

CiteScore

4.70

自引率

7.10%

发文量

472

审稿时长

3.6 months

期刊介绍： Journal of Polymer Research provides a forum for the prompt publication of articles concerning the fundamental and applied research of polymers. Its great feature lies in the diversity of content which it encompasses, drawing together results from all aspects of polymer science and technology. As polymer research is rapidly growing around the globe, the aim of this journal is to establish itself as a significant information tool not only for the international polymer researchers in academia but also for those working in industry. The scope of the journal covers a wide range of the highly interdisciplinary field of polymer science and technology, including: polymer synthesis; polymer reactions; polymerization kinetics; polymer physics; morphology; structure-property relationships; polymer analysis and characterization; physical and mechanical properties; electrical and optical properties; polymer processing and rheology; application of polymers; supramolecular science of polymers; polymer composites.