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| Comparison of adsorption performance and mechanism analysis of Zn-Fe co-activated magnetic biochar for tetracycline and chromium |
| Received:August 20, 2024 |
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| KeyWord:magnetic biochar;bagasse;tetracycline;Cr（Ⅵ）;adsorption |
| Author Name | Affiliation | E-mail | | ZHAO Chuanqi | Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and Ecological Remediation, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China | | | GONG Sinuo | Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and Ecological Remediation, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China | | | CHEN Yuxuan | Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and Ecological Remediation, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China | | | TAN Wen | Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and Ecological Remediation, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China | | | WEN Lichun | Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and Ecological Remediation, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China | | | XUAN Yongxi | Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and Ecological Remediation, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China | | | PAN Honghui | Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and Ecological Remediation, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China | | | SHI Qin | Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and Ecological Remediation, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China | jackshiqin@outlook.com |
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| Abstract: |
| In response to the widespread problems of antibiotic and heavy metal pollution in water bodies, this study used sugarcane bagasse as raw material and FeCl3 and ZnCl2 as activators to prepare magnetic biochar materials with high adsorption performance. By studying the influence of different factors, the adsorption performance of the material for tetracycline（TC）and Cr（Ⅵ）pollutants was explored, and its adsorption mechanism was analyzed. The results showed that magnetic biochar has a porous internal structure with a specific surface area of up to 913.81 m2·g-1; It has successfully loaded Fe3O4 on its surface and is rich in oxygen-containing functional groups such as OH and COOH. The adsorption of TC by magnetic biochar mainly relies on π-π conjugation, Van Der Waals forces, and hydrogen bonding forces, while the adsorption of Cr（Ⅵ）is mainly affected by electrostatic, reduction, and complexation effects. The fitting results of the adsorption kinetics model indicate that the adsorption process of TC and Cr（Ⅵ）by the composite material is more in line with the quasi second order kinetics model, indicating that the adsorption process is controlled by chemical reactions. The adsorption isotherm model analysis shows that the adsorption process of TC by magnetic biochar is more in line with the Langmuir isotherm model, indicating that TC exists in a single-layer adsorption form on the surface of magnetic biochar; The adsorption process of Cr（Ⅵ）is more in line with the Freundlich isotherm model, indicating that Cr（Ⅵ）exists in a multi-layer adsorption form on the surface of magnetic biochar. In addition, after 5 repeated uses, the composite material can still maintain high adsorption performance. This indicates that using activation method to prepare magnetic biochar composite materials is an effective means to reduce environmental pollution and achieve the resource utilization of agricultural waste. |
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