| 陈天涯,袁木子,张舒羽,马秀兰,韩兴,王玉军,王波.老化秸秆生物炭对诺氟沙星吸附特性的研究[J].农业环境科学学报,2022,41(5):1047-1057. |
| 老化秸秆生物炭对诺氟沙星吸附特性的研究 |
| Effects of aged straw biochar on the adsorption characteristics of norfloxacin |
| 投稿时间：2021-10-06 |
| DOI：10.11654/jaes.2021-1148 |
| 中文关键词: 玉米秸秆 生物炭 老化 表征 吸附 诺氟沙星 |
| 英文关键词: maize stover biochar aging characterization adsorption norfloxacin |
| 基金项目:吉林省科技发展项目（20200402013NC） |
| 作者 | 单位 | E-mail | | 陈天涯 | 吉林农业大学资源与环境学院, 长春 130118
吉林省商品粮基地土壤资源可持续利用重点实验室, 长春 130118 | | | 袁木子 | 吉林农业大学资源与环境学院, 长春 130118
吉林省商品粮基地土壤资源可持续利用重点实验室, 长春 130118 | | | 张舒羽 | 吉林农业大学资源与环境学院, 长春 130118
吉林省商品粮基地土壤资源可持续利用重点实验室, 长春 130118 | | | 马秀兰 | 吉林农业大学资源与环境学院, 长春 130118
吉林省商品粮基地土壤资源可持续利用重点实验室, 长春 130118 | 491277643@qq.com | | 韩兴 | 吉林农业大学资源与环境学院, 长春 130118
吉林省商品粮基地土壤资源可持续利用重点实验室, 长春 130118 | | | 王玉军 | 吉林农业大学资源与环境学院, 长春 130118
吉林省商品粮基地土壤资源可持续利用重点实验室, 长春 130118 | | | 王波 | 吉林农业大学信息技术学院, 长春 130118 | 81494856@qq.com |
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| 摘要点击次数: 2006 |
| 全文下载次数: 1892 |
| 中文摘要: |
| 为研究老化秸秆生物炭的性质及对水中诺氟沙星的吸附特性，本研究将新鲜生物炭进行自然老化、冻融循环老化和高温老化，通过元素分析、扫描电镜和红外光谱分析老化前后生物炭的组成和结构特性变化，研究老化生物炭对诺氟沙星的吸附机理以及pH、离子类型和离子浓度对吸附效果的影响。结果表明：不同老化方式均使生物炭的C元素含量降低，O元素含量显著增加，极性增加，芳香性降低，其中高温老化影响最大。高温老化使生物炭表面的—OH和C=C明显减少，冻融循环老化使—OH数量增加，自然老化对生物炭表面官能团影响较小。老化使生物炭表面破损、孔道塌陷，生物炭上的吸附点位被阻塞，不利于对诺氟沙星的吸附。老化前后生物炭对诺氟沙星的吸附更符合准二级动力学模型，等温吸附拟合发现，Langmuir模型能更好地拟合诺氟沙星在生物炭上的吸附过程。自然老化、冻融循环老化和高温老化分别使生物炭的吸附量降低了5.50%、7.70%、14.80%；在背景液pH 3.0~11.0范围内，老化前后生物炭对诺氟沙星的吸附量随pH增大先升高再降低，当pH为7.0时，吸附量达到最大值。阳离子价态越高，离子浓度越大，老化后生物炭对诺氟沙星的吸附量越小。研究表明，老化对生物炭的理化性质和吸附抗生素的能力均有影响，因此在使用生物炭去除目标污染物时需要考虑环境因素的影响。 |
| 英文摘要: |
| 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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