Adsorption of Pb(Ⅱ) and Cd(Ⅱ) by a new extracellular polymer-based hydrogel PAA/EPS: Preparation, properties and mechanism

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-06-13 DOI:10.1016/j.colsurfa.2025.137499

Qianqian Ding , Zhaoyang Wang , Yixuan Yang

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引用次数: 0

Abstract

In this paper, interpenetrating polymer networks (IPN) hydrogels based on extracellular polymers substances (EPS) and poly acrylic acid (PAA) were prepared by free radical polymerization. The structural design of this composite material is based on the synergistic effect of the interpenetrating network and the principle of gradient distribution of functional groups: The PAA chain forms a three-dimensional cross-linked skeleton through free radical polymerization, providing structural support and carboxyl (-COOH) active sites. As a natural biological macromolecule, the amino group (-NH₂) and phenolic hydroxyl group (-OH) in the protein component of EPS are embedded into the PAA network through hydrogen bonding, forming a dual cross-linking system of physical entanglement and chemical cross-linking. This structural design enables the gel to exhibit the characteristics of low crosslinking density (15–20 %) and high swelling ratio (2500–3000 %). Meanwhile, a hierarchical channel for heavy metal ion transport is constructed through a porous superimposed network structure, significantly enhancing the adsorption kinetic performance. Studies under different reaction conditions show that: When m(EPS):m(AA)= 1:7, c(PAA/EPS gel)= 1 g/L, c(Cd)= 3 mg/L, c(Pb)= 30 mg/L, pH= 5, T = 15℃, and the reaction time is 9 h, PAA/EPS gel has the best adsorption effect on Cd (Ⅱ) and Pb (Ⅱ). The removal rate is over 90 %. In this study, a heavy metal adsorption material was developed, achieving the resource utilization of EPS in sludge, with the aim of breaking through the kinetic bottleneck of traditional hydrogel adsorption and providing a theoretical basis for the development of new green heavy metal adsorption materials.

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新型细胞外聚合物基水凝胶PAA/EPS对Pb（Ⅱ）和Cd（Ⅱ）的吸附：制备、性能及机理

本文采用自由基聚合法制备了以胞外聚合物（EPS）和聚丙烯酸（PAA）为基体的互穿聚合物网络（IPN）水凝胶。该复合材料的结构设计基于互穿网络的协同作用和官能团的梯度分布原理：PAA链通过自由基聚合形成三维交联骨架，提供结构支撑和羧基（-COOH）活性位点。EPS作为一种天然的生物大分子，其蛋白质组分中的氨基（- nh2）和酚羟基（-OH）通过氢键嵌入到PAA网络中，形成物理缠结和化学交联的双重交联体系。这种结构设计使凝胶具有低交联密度（15-20 %）和高溶胀率（2500-3000 %）的特点。同时，通过多孔叠加网络结构构建了重金属离子输送的层次化通道，显著提高了吸附动力学性能。不同反应条件下研究表明:当m (EPS): m (AA) = 1:7,c (PAA / EPS凝胶)= 1 g / L, c (Cd) = 3 mg / L, c (Pb) = 30 mg / L, pH = 5 T = 15℃,反应时间是9 h, PAA / EPS凝胶的吸附效果最好的Cd(Ⅱ)和铅(Ⅱ)。去除率达90%以上 %。本研究开发了一种重金属吸附材料，实现污泥中EPS的资源化利用，旨在突破传统水凝胶吸附的动力学瓶颈，为新型绿色重金属吸附材料的开发提供理论依据。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.