Alginate aerogel with high adsorption performance for copper ions

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-04-26 DOI:10.1016/j.colsurfa.2025.137054

Jingzhong Duan , Shuhui Liu , Xiaoming Xu , Yao Zhang , Zixiang Dong , Zhaoguang Nie , Ruisang Liu , Xiaomeng Ren , Bingbing Wang

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Abstract

In this study, a three-dimensional network-structured magnetic silica (SiO₂) /alginate composite aerogel (Mag-SiO₂@Alg) with surface porosity was fabricated through freeze-drying technology as an environmentally friendly adsorbent. The hydroxyl and carboxyl groups in sodium alginate synergistically interacted with the magnetic silica particles, enhancing the adsorption of Cu^2 + ions. The composite aerogel exhibited a specific surface area of 158.45 m²/g and an average pore diameter of 12.68 nm, providing abundant active adsorption sites. Under optimal adsorption conditions, the composite demonstrated high adsorption capacity (122.03 mg/g) and efficiency (97.62 %) for Cu²⁺ ions. Notably, the aerogel maintained 78.8 % adsorption efficiency after four adsorption-desorption cycles, demonstrating excellent reusability. The compressive strength reached 0.9843 MPa, representing a threefold enhancement compared to pure calcium alginate aerogel (0.2229 MPa), indicating superior mechanical stability. Furthermore, the incorporated triiron tetraoxide (Fe₃O₄) nanoparticles endowed the composite with remarkable magnetic responsiveness, effectively addressing the challenges associated with adsorbent recovery. The material also exhibited notable salt tolerance in ionic environments. These comprehensive characteristics suggest that the Mag-SiO₂@Alg composite aerogel holds significant potential for wastewater treatment applications.

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对铜离子具有高吸附性能的海藻酸盐气凝胶

本研究通过冷冻干燥技术制备了具有表面孔隙度的三维网状磁性二氧化硅(SiO2) /海藻酸盐复合气凝胶（Mag-SiO2@Alg）作为环保吸附剂。海藻酸钠中的羟基和羧基与磁性二氧化硅颗粒协同作用，增强了对Cu2 +离子的吸附。复合气凝胶的比表面积为158.45 m2/g，平均孔径为12.68 nm，具有丰富的活性吸附位点。在最佳吸附条件下，复合材料对Cu2+离子的吸附量为122.03 mg/g，吸附效率为97.62 %。值得注意的是，经过4次吸附-解吸循环后，气凝胶的吸附效率保持在78.8% %，具有良好的可重复使用性。抗压强度达到0.9843 MPa，比纯海藻酸钙气凝胶（0.2229 MPa）提高了3倍，力学稳定性更好。此外，加入的四氧化三铁（Fe3O4）纳米颗粒赋予复合材料显著的磁响应性，有效地解决了与吸附剂回收相关的挑战。该材料在离子环境中也表现出显著的耐盐性。这些综合特性表明Mag-SiO2@Alg复合气凝胶在废水处理应用中具有巨大的潜力。

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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.