Aqueous-phase fabrication of cellulose-mineral composites with enhanced Cd(II) adsorption and mechanistic insights

IF 6.2 1区农林科学 Q1 AGRICULTURAL ENGINEERING

Industrial Crops and Products Pub Date : 2025-10-16 DOI:10.1016/j.indcrop.2025.122133

Peipei Meng , Qianya Zhou , Na Zhang , Lijuan Zhang , Liuchun Zheng

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Abstract

In this study, a green and sustainable synthesis strategy was developed to fabricate cellulose-based composite adsorbents by replacing the organic dispersion system previously used with an aqueous medium. Two inorganic fillers, sepiolite and TiO₂, were respectively incorporated to prepare cellulose-sepiolite (CgS(H₂O)) and cellulose-TiO₂ (CgT(H₂O)) composites, aiming to investigate the influence of mineral type and dispersion phase on Cd(II) adsorption performance and mechanism. Compared to the earlier reported CAT material synthesized in organic media, both aqueous-phase composites showed enhanced porosity, surface functionality, and carboxyl group distribution. CgS(H₂O) exhibited a fluffy, porous network structure with high micro/mesopore connectivity, achieving a maximum Cd(II) capacity of 239.45 mg/g. CgT(H₂O), with higher surface area and Ti–O active sites, demonstrated the highest capacity of 368.82 mg/g, significantly surpassing CAT (105 mg/g). Kinetic and isotherm analysis revealed that CgS(H₂O) followed multilayer chemisorption, while CgT(H₂O) conformed to monolayer Langmuir-type adsorption. Density functional theory (DFT) simulations further indicated stronger binding affinities and more active carboxyl-dominant sites in CgT(H₂O), while CgS(H₂O) benefited from networked carboxyl groups and Si–O-based interaction domains. These findings collectively highlight that the aqueous dispersion strategy, combined with targeted mineral selection, enhances not only environmental friendliness but also material structure and adsorption efficiency, offering a versatile platform for efficient heavy metal removal from water.

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增强Cd（II）吸附的纤维素-矿物复合材料的水相制备及其机理研究

在这项研究中，开发了一种绿色和可持续的合成策略，通过用水介质代替以前使用的有机分散系统来制造纤维素基复合吸附剂。采用海泡石和二氧化钛两种无机填料分别制备纤维素-海泡石（CgS(H₂O)）和纤维素-二氧化钛（CgT(H₂O)）复合材料，探讨矿物类型和分散相对Cd（II）吸附性能的影响及其机理。与之前报道的在有机介质中合成的CAT材料相比，两种水相复合材料都具有增强的孔隙度、表面功能和羧基分布。CgS（H₂O）表现出蓬松的多孔网络结构，具有较高的微孔/介孔连通性，最大Cd（II）容量为239.45 mg/g。CgT（H₂O）具有较高的表面积和Ti-O活性位点，容量最高，为368.82 mg/g，显著优于CAT（105 mg/g）。动力学和等温线分析表明，CgS（H₂O）服从多层化学吸附，而CgT（H₂O）服从单层langmuir吸附。密度泛功能理论（DFT）模拟进一步表明，CgT（H₂O）具有更强的结合亲和力和更活跃的羧基优势位点，而CgS（H₂O）则受益于网络羧基和si基相互作用域。这些发现共同强调了水分散策略，结合有针对性的矿物选择，不仅提高了环境友好性，而且提高了材料结构和吸附效率，为有效去除水中重金属提供了一个多功能平台。

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来源期刊

Industrial Crops and Products 农林科学-农业工程

CiteScore

9.50

自引率

8.50%

发文量

1518

审稿时长

43 days

期刊介绍： Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.