Carboxymethyl cellulose sodium/bentonite composite adsorbent for Cd(II) adsorption from wastewater

IF 23.2 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Advanced Composites and Hybrid Materials Pub Date : 2025-01-11 DOI:10.1007/s42114-024-01185-x

Wang Li, Lianzheng Zhang, Tongming Su, Xuan Luo, Xinling Xie, Zuzeng Qin

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Abstract

Severely polluting wastewater containing heavy metal ions has become a pressing issue. To address the current shortcomings of natural bentonite (Bent) and carboxymethyl cellulose sodium (CMC) for Cd(II) adsorption, this study developed a cellulose/bentonite composite adsorbent (CMC_MW-Bent) via microwave-assisted synthesis using acrylic acid (AA)-modified CMC and pretreated bentonite (Bent), and the adsorbent was used to remove Cd(II) from wastewater. The results show that the strong interaction between AA and CMC, which successfully entered the bentonite layer, and the bentonite provided excellent structural stability and abundant adsorption sites for the adsorption process. Meanwhile, microwave-assisted heating enhanced this unique structure compared to traditional heating with the aqueous solution. The best adsorption effect occurred at pH = 6–7, with a maximum adsorption capacity of 44.76 mg/g for Cd(II). The isothermal adsorption and kinetic models demonstrate that the adsorption process followed the Langmuir adsorption fitting and pseudo-second-order kinetic equations. The thermodynamic study confirms that the adsorption process was a spontaneous endothermic process and a chemical adsorption process. This study provides a new approach for obtaining efficient adsorbents.

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羧甲基纤维素钠/膨润土复合吸附剂对废水中镉的吸附

含重金属离子的严重污染废水已成为一个亟待解决的问题。针对目前天然膨润土（Bent）和羧甲基纤维素钠（CMC）吸附Cd（II）的不足，以丙烯酸（AA）改性的CMC和预处理的膨润土（Bent）为原料，通过微波辅助合成了纤维素/膨润土复合吸附剂（CMCMW-Bent），并将其用于废水中Cd（II）的去除。结果表明：AA与CMC之间的强相互作用使其顺利进入膨润土层，膨润土为吸附过程提供了优异的结构稳定性和丰富的吸附位点。同时，与传统的水溶液加热相比，微波辅助加热增强了这种独特的结构。pH = 6 ~ 7时吸附效果最佳，对Cd（II）的最大吸附量为44.76 mg/g。等温吸附和动力学模型表明，吸附过程符合Langmuir吸附拟合和拟二阶动力学方程。热力学研究证实了吸附过程为自发吸热过程和化学吸附过程。本研究为获得高效吸附剂提供了一条新的途径。

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来源期刊

Advanced Composites and Hybrid Materials Multiple-

CiteScore

26.00

自引率

21.40%

发文量

185

期刊介绍： Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.