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| Enhanced adsorption activity of manganese oxide-modified biochar for the removal of tetracycline from aqueous solution |
| Received:July 14, 2020 |
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| KeyWord:biochar;manganese oxide;tetracycline;adsorption;influencing factors |
| Author Name | Affiliation | E-mail | | ZHAO Zhi-wei | College of Environment and Ecology, Chongqing University, Chongqing 400044, China | | | CHEN Chen | College of Environment and Ecology, Chongqing University, Chongqing 400044, China | | | LIANG Zhi-jie | College of Environment and Ecology, Chongqing University, Chongqing 400044, China | zhjliang@cqu.edu.cn | | CUI Fu-yi | College of Environment and Ecology, Chongqing University, Chongqing 400044, China | |
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| Abstract: |
| In this study, manganese oxide modified biochar(MBC)was synthesized using MnCl2 as a modifier to enhance the adsorption capacity of biochar for tetracycline in water. The specific surface area method(BET), X-Ray diffraction(XRD), and Fourier transform infrared spectroscopy(FTIR)were used to characterize the microstructure of the modified and pristine biochar. The influencing factors and adsorption behavior of biochar were investigated using the batch technique. The results showed that the maximum adsorption capacity of MBC calculated by the Langmuir model was 736 mg·g-1, which was 15 times higher than the adsorption by the raw biochar. In this study, the adsorption process was a spontaneous and endothermic reaction, which fit the pseudo-second-order kinetic model and was controlled by both physical and chemical processes. pH value and divalent cations in solution were both important factors for the adsorption of MBC, whereas the monovalent cation and humic acid had only a slight effect. The hydrogen bonding, electrostatic interaction, and complexation between manganese ion and tetracycline were the main mechanisms for the removal of tetracycline through MBC adsorption. All the results showed that compared with the pristine biochar, the adsorption capacity of MBC was significantly improved, which indicated that MBC had a wider range of application and a good application prospect for the removal of antibiotics in water. |
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