| 芦苇基和污泥基生物炭对水体中诺氟沙星的吸附性能 |
| 摘要点击 3461 全文点击 1656 投稿时间：2015-08-07 修订日期：2015-09-29 |
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| 中文关键词 诺氟沙星 生物炭 吸附 含氧官能团 氢键 |
| 英文关键词 norfloxacin biochars adsorption oxygen-containing functional groups hydrogen bonds |
| 作者 | 单位 | E-mail | | 张涵瑜 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | zhanghanyu9014@163.com | | 王兆炜 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | | | 高俊红 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | | | 朱俊民 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | | | 谢超然 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | | | 谢晓芸 | 兰州大学资源环境学院, 甘肃省环境污染预警与控制重点实验室, 兰州 730000 | xiexiaoyun@lzu.edu.cn |
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| 中文摘要 |
| 以芦苇秸秆和市政污水处理厂污泥为原料,在500℃ 的条件下制备了芦苇基和污泥基生物炭. 利用比表面积测定法(BET)、 扫描电镜(SEM)、 能谱分析(EDS)和红外光谱(FTIR)研究了生物炭的结构与性质,并通过单因素实验研究pH、 吸附时间、 温度、 诺氟沙星(NOR)初始浓度对吸附效果的影响,初步讨论了吸附机制. 结果表明,NOR在芦苇基和污泥基生物炭上的吸附在12 h分别达到总吸附量的70%、 60%以上; 芦苇基和污泥基生物炭对NOR的饱和吸附量分别为2.13 mg ·g-1和2.09mg ·g-1; 降低溶液pH有利于NOR的吸附; 生物炭对NOR的吸附行为符合准二级动力学方程, 其等温吸附曲线符合Langmuir方程. 对吸附过程吉布斯自由能(ΔG)、 焓(ΔH)以及熵(ΔS)的计算证明生物炭对NOR的吸附是自发的吸热反应; 红外光谱分析表明,生物炭上较多含氧官能团为NOR的吸附提供了吸附点,有利于NOR分子与生物炭间形成作用力较强的氢键,氢键为NOR吸附在生物炭上的主导作用力. |
| 英文摘要 |
| Two types of biochars were prepared by pyrolyzing reed straw and municipal sludge at the temperature of 500℃. The structure and properties of biochars were characterized by BET, scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and fourier transform infrared spectroscopy (FTIR). The effects of pH value, adsorption time, temperature and initial concentration of norfloxacin (NOR) on the adsorption behaviors were determined by single factor experiments, which were used to preliminarily discuss adsorption mechanism. The results showed that the adsorption of NOR onto biochars derived from reed straw and municipal sludge could reach 70% and 60% of the total adsorption within 12 h, respectively; the maximum adsorption capacities of the two biochars were 2.13 mg ·g-1 (biochar derived from reed straw) and 2.09 mg ·g-1 (biochar derived from municipal sludge). The quantities of both absorptions increased with the decreasing solution pH. The two adsorption kinetics of NOR onto biochars followed the pseudo second order kinetic equations, and adsorption isotherms fitted well with the Langmuir equations. Adsorption thermodynamics parameters such as Gibbs free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) indicated that the two adsorptions were endothermic reactions. Infrared spectroscopy analysis indicated that oxygen-containing functional groups on biochars provided NOR molecules with adsorptive sites, which facilitated the formation of hydrogen bonds between NOR and the biochars. |
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