Adsorption of fluoxetine in aqueous environments: Development of macroporous cryogels based on sodium poly(acrylate) and carboxymethyl chitosan

IF 4.5 3区工程技术 Q1 CHEMISTRY, APPLIED

Reactive & Functional Polymers Pub Date : 2024-10-11 DOI:10.1016/j.reactfunctpolym.2024.106069

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Abstract

This study focuses on the development of macroporous monoliths using cryopolymerization of sodium acrylate/carboxymethyl chitosan solutions for the adsorption of the antidepressant fluoxetine in aqueous environments. The cryogels were characterized using various analytical techniques, and the effects of pH, temperature, initial concentration, and contact time on the adsorption capacity were investigated. The surface charge of the cryogel was negative when pH_solution > pH_PZC, and pH 8.5 was optimal for swelling rates and fluoxetine removal efficiency. The NaPA₄-CMCs cryogel (0.5 mg.mL⁻¹) showed the best adsorption performance, with the pseudo-first-order model best describing the experimental kinetics data. The intraparticle diffusion model revealed rapid diffusion through macropores and mesopores. The Langmuir model fitted well to the experimental adsorption equilibrium data, with q_max = 80.6 ± 3.4 mg.g⁻¹. The adsorption process was favorable, exothermic, and governed by physisorption, involving electrostatic, hydrogen bonding, π–π, and hydrophobic interactions. The binary solvent HCl (0.1 M)/methanol 1:1 v/v was effective for regenerating the adsorbent, with adsorption efficiency greater than 60 % after three cycles of reuse. The study highlights the potential of these macroporous monoliths for the effective removal of antidepressants from aqueous environments.

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水环境中氟西汀的吸附：基于聚丙烯酸钠和羧甲基壳聚糖的大孔低温凝胶的开发

本研究的重点是利用丙烯酸钠/羧甲基壳聚糖溶液的低温聚合技术开发大孔单体，用于在水环境中吸附抗抑郁药氟西汀。利用各种分析技术对冷凝胶进行了表征，并研究了 pH 值、温度、初始浓度和接触时间对吸附能力的影响。当 pHsolution > pHPZC 时，冷凝凝胶的表面电荷为负，pH 8.5 是溶胀率和氟西汀去除效率的最佳值。NaPA4-CMCs 冰凝胶（0.5 mg.mL-1）的吸附性能最好，伪一阶模型最能描述实验动力学数据。粒子内扩散模型显示了通过大孔和中孔的快速扩散。Langmuir 模型与实验吸附平衡数据拟合良好，qmax = 80.6 ± 3.4 mg.g-1。吸附过程是有利的、放热的，由物理吸附作用控制，涉及静电、氢键、π-π 和疏水相互作用。盐酸（0.1 M）/甲醇 1:1 v/v 的二元溶剂对吸附剂的再生有效，经过三个循环的重复使用，吸附效率大于 60%。这项研究凸显了这些大孔整体吸附剂从水环境中有效去除抗抑郁药物的潜力。

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来源期刊

Reactive & Functional Polymers 工程技术-高分子科学

CiteScore

8.90

自引率

5.90%

发文量

259

审稿时长

27 days

期刊介绍： Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers. Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.