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| Adsorption performance of tetracycline by manganese ferrite-modified biochar |
| Received:November 29, 2022 |
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| KeyWord:biochar;manganese ferrite;surface modification;adsorption kinetics;tetracycline |
| Author Name | Affiliation | E-mail | | LIN Bingfeng | College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-Environment of Three Gorges Reservoir Area, Ministry of Education, Three Gorges University, Yichang 443002, China | | | CHEN Zhihao | College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-Environment of Three Gorges Reservoir Area, Ministry of Education, Three Gorges University, Yichang 443002, China | | | YANG Fangli | College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-Environment of Three Gorges Reservoir Area, Ministry of Education, Three Gorges University, Yichang 443002, China | | | WU Yonghong | College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China
State Key Laboratory of Soil and Sustainable Agricultural Development, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | TANG Cilai | College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China
Engineering Research Center of Eco-Environment of Three Gorges Reservoir Area, Ministry of Education, Three Gorges University, Yichang 443002, China | bolong8111@163.com |
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| Abstract: |
| To improve the adsorption effect of tetracycline（TC）by biochar, manganese ferrite was used to modify orange peel biochar. Manganese ferrite-modified orange peel biochar（BC@MnFe2O4）was prepared by co-precipitation and pyrolysis, and the materials were characterized using SEM, BET, XRD, FT-IR, and XPS. The effects of initial pH, biochar dosage, TC concentration, and coexisting ions on TC sorption by BC@MnFe2O4 were investigated via batch experiments. The results showed that the manganese ferrite uniformly coated the surface of biochar. Compared with the raw biochar, the BC@MnFe2O4 had a richer pore structure, and the specific surface area was increased from 2.86 m2·g-1 to 306.12 m2·g-1 after modification. The results of FT-IR implied the presence of —OH,—Mn—O, and —Fe—O functional groups on the surface of BC@MnFe2O4. The maximum adsorption capacity of TC by BC@MnFe2O4 was 167.50 mg·g-1, which is 12 times than that of raw biochar（13.21 mg·g-1）. The adsorption process was consistent with the quasi-secondary kinetic equation and the Freundlich isothermal adsorption model. The adsorption mechanism was mainly chemical adsorption with multi-layer adsorption. BC@MnFe2O4 broadened the pH scope of application. As the pH increased from 3 to 11, the adsorption efficiency gradually decreased, but at pH 11, the removal efficiency was still 80%. The presence of NO -3 and SO2-4 in the solution had no significant effect on the adsorption of TC by BC@MnFe2O4, and the adsorption capacity of TC increased slightly by 5.44 mg·g-1 with the increase of NH+4. However, humic acid significantly inhibited the adsorption of TC due to the competition with TC for adsorption points. BC@MnFe2O4 still achieved 61.65% adsorption capacity after 5 cycling runs, with good application potential. XPS analysis showed that oxygen-containing functional groups such as Mn—O and Fe—O played a major role in the adsorption of TC, and the valence of Mn and Fe elements increased after sorption, as well as the change of functional groups, indicating that the modified biochar and TC underwent electron transfer and formed covalent bonds. It implies that manganese ferrite modification significantly improves the adsorption capacity of TC by BC@MnFe2O4, has a good adsorption effect in a wide pH range, and is less disrupted by coexisting ions in an aqueous solution. |
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