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| Preparation of Sodium Alginate Hydrogels and Its Adsorption Property Towards Heavy Metal Ions |
| Received:February 22, 2024 Revised:March 01, 2024 |
| DOI：10.11981/j.issn.1000-6842.2025.01.83 |
| Key Words:sodium alginate;biomass hydrogel;heavy metal ions;adsorption kinetic |
| Fund Project:湖南省自然科学基金（2023JJ30012）；细胞化学湖南省重点实验室开放基金（2021xbhx03）；电力与交通材料保护湖南省重点实验室开放基金。 |
| Author Name | Affiliation | Postcode | | LI Yulin | School of Chemistry and Pharmaceutical Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | WANG Yulong* | School of Chemistry and Pharmaceutical Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | CHEN Fangxing | School of Chemistry and Pharmaceutical Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | LIN Yahui | School of Chemistry and Pharmaceutical Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | YANG Rui | School of Chemistry and Pharmaceutical Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | KUANG Yishan | School of Chemistry and Pharmaceutical Engineering， Changsha University of Science and Technology， Changsha， Hu’nan Province， 410114 | 410114 | | ZHANG Hongjie | China National Pulp and Paper Research Institute Co. Ltd.， Beijing， 100102
National Engineering Lab for Pulp and Paper，Beijing， 100102 | 100102 |
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| Abstract: |
| The sodium alginate （SA） hydrogel was successfully prepared by using SA as the substrate and ADH as the cross-linking agent at normal temperature and pressure. The chemical structure， surface morphology， thermal stability and swelling ability of SA hydrogel were characterized through Fourier transform infrared spectroscopy （FT-IR）， scanning electron microscope （SEM） thermogravimetry analysis （TG）， etc. And the adsorption performance and mechanism of the SA hydrogel towards heavy metal ions （Cu2+， Pb2+ and Cr6+） was investigated. The results showed that the SA was crosslinked through the amide bond （—CONH—） to form a hydrogel network， and the SA hydrogel with a “honeycomb” porous surface structure had good thermal stability and high swelling rate. Under the condition of adsorption temperature 25 ℃， initial mass concentration of heavy metal ions 50 mg/L， optimal adsorption pH value of adsorption system （pH=4 for Cu2+and Pb2+， pH=3 for Cr6+）， and the adsorption time 480 min， the SA hydrogel had good adsorption performance for Cu2+， Pb2+， and Cr6+， and the equilibrium adsorption capacity was 75.3， 129.5， and 26.4 mg/g， respectively. The dynamic and thermodynamic analysis showed that the adsorption process of SA hydrogel for Cu2+， Pb2+ and Cr6+ conformed to the pseudo second order kinetic model and Freundlich adsorption isotherm model， which belongs to the multi molecular layer chemical adsorption and was an endothermic process that can be carried out spontaneously in the forward direction. |
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