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pH对生物质炭吸附诺氟沙星和磺胺甲恶唑的影响

Effect of pH on biochar adsorption of norfloxacin and sulfamethoxazole
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摘要 为解决水体中抗生素去除及芦苇秸秆资源化利用等问题,以芦苇秸秆制备的生物质炭为吸附材料,考察不同pH条件下诺氟沙星(NOR)和磺胺甲恶唑(SMX)在芦苇秸秆生物质炭上的等温吸附过程及吸附动力学。结果表明,生物质炭的吸附与NOR和SMX在不同溶液pH下的存在形态有关。随pH的增加,生物质炭对NOR的吸附量先增加后减小,最高吸附量为7.80 mg·g^-1;生物质炭对SMX的吸附量在溶液pH 1~3时逐渐减小,在pH 3~5时逐渐增加,pH>5时吸附量逐渐降低。拟二级动力学模型可较好地拟合NOR和SMX在生物质炭上的吸附,生物质炭吸附NOR和SMX受到表面吸附、颗粒内扩散等作用的共同影响。吸附等温线符合Langmuir方程,吸附过程以单分子层吸附为主。溶液不同的pH会影响芦苇秸秆生物质炭对NOR和SMX的吸附效果,这为生物质炭吸附水中抗生素的合理应用提供一定的数据支持。 To solve the problems of antibiotic removal and resource utilization of reed straw in water,the adsorption isotherms and kinetics of norfloxacin(NOR)and sulfamethoxazole(SMX)on reed straw biochar at different pH were investigated.The results showed that the ad⁃sorption of biochar was related to the existent morphology of NOR and SMX in different pH solutions.With increasing pH,the adsorption of NOR by biochar increased first and then decreased,with maximum adsorption capacity of 7.80 mg·g^-1.The adsorption capacity of biochar to SMX decreased gradually in the range of pH 1~3,increased gradually in the range of pH 3~5,and decreased gradually when pH was greater than 5.The adsorption kinetics of NOR and SMX on biochar was more in line with the quasi-second-order kinetics equation and the adsorption process was affected by both surface adsorption and intraparticle diffusion.Isothermal adsorption behavior was more consis⁃tent with the Langmuir isotherm model,and the adsorption process was dominated by monolayer adsorption.Differences in the pH of the so⁃lution will affect the adsorption of NOR and SMX on reed straw biochar,which provides data support for the rational application of biochar in adsorbing antibiotics in water.
作者 张亚茹 张英 史祥利 刘莹 刘宪斌 卢少勇 毕斌 万正芬 杨勇 ZHANG Ya-ru;ZHANG Ying;SHI Xiang-li;LIU Ying;LIU Xian-bin;LU Shao-yong;BI Bin;WAN Zheng-fen;YANG Yong(College of Marine and Environmental Sciences,Tianjin University of Science and Technology,Tianjin 300457,China;College of Geography and Environment,Shandong Normal University,Jinan 250358,China;State Environmental Protection Scientific Observation and Research Station for Lake Dongting,State Key Labratory of Environment Criteria and Risk Assessment,National Engineering Laborato⁃ry for Lake Pollution Control and Ecological Restoration,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;China National Environmental Monitoring Centre,Beijing 100012,China)
出处 《农业资源与环境学报》 CAS 北大核心 2020年第4期552-561,共10页 Journal of Agricultural Resources and Environment
基金 国家自然科学基金面上项目(41877409) 科技基础性工作专项重点项目(2015FY110900)。
关键词 生物质炭 抗生素 PH 吸附动力学 吸附等温线 biochar antibiotics pH adsorption kinetics adsorption isotherms
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