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| Effects of aged straw biochar on the adsorption characteristics of norfloxacin |
| Received:October 06, 2021 |
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| KeyWord:maize stover;biochar;aging;characterization;adsorption;norfloxacin |
| Author Name | Affiliation | E-mail | | CHEN Tianya | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Sustainable Utilization of Soil Resources in Commercial Grain Bases in Jilin Province, Changchun 130118, China | | | YUAN Muzi | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Sustainable Utilization of Soil Resources in Commercial Grain Bases in Jilin Province, Changchun 130118, China | | | ZHANG Shuyu | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Sustainable Utilization of Soil Resources in Commercial Grain Bases in Jilin Province, Changchun 130118, China | | | MA Xiulan | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Sustainable Utilization of Soil Resources in Commercial Grain Bases in Jilin Province, Changchun 130118, China | 491277643@qq.com | | HAN Xing | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Sustainable Utilization of Soil Resources in Commercial Grain Bases in Jilin Province, Changchun 130118, China | | | WANG Yujun | College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China
Key Laboratory of Sustainable Utilization of Soil Resources in Commercial Grain Bases in Jilin Province, Changchun 130118, China | | | WANG Bo | College of Information Technology, Jilin Agricultural University, Changchun 130118, China | 81494856@qq.com |
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| Abstract: |
| This study investigated the properties of aged straw biochar and its effect on the adsorption of norfloxacin in water and provided a theoretical basis for the removal of norfloxacin from water using biochar. The original biochar was subjected to natural aging, freeze-thaw cycle aging, and high-temperature aging. The changes in the composition and structural properties of the original and aged biochars were analyzed using elemental analysis, SEM, and FT-IR to study the adsorption mechanism of aged biochar on norfloxacin and the effects of pH, ion type, and ion concentration on the adsorption effect. All the different aging methods decreased the C content of biochar, significantly increased the O content, increased the polarity, and decreased the aromaticity. In addition, high-temperature aging significantly reduced the —OH and C=C on the surface of the biochar, and freeze-thaw cyclic aging increased the amount of —OH. Naturally aged biochar had little effect on the functional groups on the surface of the biochar. Aging damaged the surface of the biochar and collapsed the pore channels, blocking the adsorption sites on the biochar and inhibiting the adsorption of norfloxacin. The adsorption of norfloxacin on the original and aged biochars was more consistent with the quasi-secondary kinetic model, and isothermal adsorption fitting revealed that the Langmuir model could better fit the adsorption process of norfloxacin on biochar. Natural aging, freeze-thaw cycling aging, and high-temperature aging decreased the adsorption of biochar by 5.50%, 7.70%, and 14.80%, respectively. Under the pH range（3.0~11.0）of the background liquid, the adsorption of norfloxacin on biochar before and after aging increased and then decreased with pH, and the adsorption reached a maximum at pH 7.0. The higher the cation valence and the ion concentration, the smaller the adsorption of norfloxacin by biochar before and after aging. Furthermore, there were differences in the adsorption of norfloxacin by biochar with different aging methods, and aging caused changes in elemental content, surface morphology, and functional groups of biochar, which were not favorable for the adsorption of norfloxacin. Research has shown that aging has an effect on both the physicochemical properties and the ability of biochar to adsorb norfloxacin. Therefore, the influence of environmental factors needs to be considered when using biochar to remove target contaminants. |
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