Adsorption properties of cellulose-derived hydrogel and magnetic hydrogels from Sophora flavescens on Cu 2+ and Congo red

This study synthesized a robust, magnetically responsive hydrogel from Sophora flavescens-modified cellulose and chitosan, employing Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA and DTG), and scanning electron microscopy (SEM) to confirm th...

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Bibliographic Details
Published in:International journal of biological macromolecules 2024-08, Vol.274 (Pt 1), p.133209
Main Authors: Xu, Hai Yang, Yang, XianWen, Yu, RunPing, Zuo, Ting, Liu, QiuYue, Jia, ShunPeng, Jia, Ling Yun
Format: Article
Language:English
Subjects:
Adsorption
Cellulose - chemistry
Chitosan - chemistry
Congo Red - chemistry
Copper - chemistry
Hydrogels - chemistry
Hydrogen-Ion Concentration
Kinetics
Sophora - chemistry
Sophora flavescens
Spectroscopy, Fourier Transform Infrared
Thermodynamics
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - isolation & purification
Water Purification - methods
X-Ray Diffraction
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Summary:This study synthesized a robust, magnetically responsive hydrogel from Sophora flavescens-modified cellulose and chitosan, employing Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA and DTG), and scanning electron microscopy (SEM) to confirm the preservation of cellulose's intrinsic properties and the hydrogel's remarkable elasticity, toughness, and porosity. These hydrogels integrate cellulose's structural backbone with functional moieties from chitosan, enhancing adsorption capabilities for Cu ions and Congo red (CR) dye. Kinetic and thermodynamic analyses reveal that adsorption is spontaneous and endothermic, following a pseudo-second-order model and the Freundlich isotherm. Notably, Cu adsorption capacity increases with pH, while CR adsorption initially decreases before rising, demonstrating the hydrogels' potential as effective, sustainable adsorbents for removing pollutants from water.
ISSN:1879-0003