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| Preparation of Calcium Carbonate Composite Materials and Their Adsorption of Fe3+ |
| Received:December 25, 2025 Revised:January 27, 2026 |
| DOI：10.11980/j.issn.0254-508X.2026.04.023 |
| Key Words:dopamine sodium alginate calcium carbonate Fe3+ adsorption |
| Fund Project:陕西科技大学自然科学前沿研究基金（2020XSGG-07）；陕西省重点研发计划（2022GY-278）；陕西省自然科学基金（2023-JC-YB-104）；广西清洁化制浆造纸与污染控制重点实验室开放基金（2023GXZZKF36）。 |
| Author Name | Affiliation | Postcode | | JIAO Xinye* | College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | JIANG Xue* | College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | TIAN Xiuzhi | College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | DU Yichun | College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | XIAO Jiale | College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | XIANG Zhong | College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi Province, 710021 | 710021 | | LI Yuhang | College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi Province, 710021 | 710021 |
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| Abstract:This study aimed to investigate the influence mechanisms of dopamine (DA) and sodium alginate (SA) as regulating agents on the structure of calcium carbonate composites and their adsorption performance for Fe3+. By adjusting the concentrations of DA and SA, the regulatory effects on the crystal phase, microstructure, and particle size distribution of calcium carbonate were systematically studied, and the adsorption performance and cycling stability of the two composites for Fe3+ were compared. The results showed that the adsorption behavior of DA-CaCO3 conformed to the Freundlich isothermal adsorption model, indicating its heterogeneous surface and adsorption dominated by multilayer physisorption and weak chemical interactions with Fe3+. In contrast, SA-CaCO3 better followed the Langmuir isothermal adsorption model, suggesting relatively uniform surface sites and a monolayer chemisorption process dominated by chelation, with a theoretical maximum adsorption capacity of 515.36 mg/g. Cycling experiments further showed that SA-CaCO3 maintained a removal rate above 80% towards Fe3+ after 5 times of adsorption-desorption cycles， demonstrating a good regeneration stability. |
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