有机-无机酸复合改性生物炭对3种抗生素的吸附  

Adsorption of Three Antibiotics by Biochar Modified with Organic Acid-Inorganic Acid

作　　者：许京倩 宋点雨 李文斌 郭梦婷 邓红艳 XU Jingqian;SONG Dianyu;LI Wenbin;GUO Mengting;DENG Hongyan(College of Environmental Science and Engineering,China West Normal University,Nanchong,Sichuan 637009,China)

机构地区：[1]西华师范大学环境科学与工程学院,四川南充637009

出　　处：《环境监测管理与技术》2024年第5期79-82,共4页The Administration and Technique of Environmental Monitoring

基　　金：国家自然科学基金资助项目(41271244);四川省科技计划基金资助项目(2018JY0224);西华师范大学科研业务基金资助项目(18B023)。

摘　　要：采用无机酸和有机酸改性莲子草生物炭,分析pH值、离子强度和温度对生物炭吸附抗生素的影响,并在最佳环境条件下对比不同生物炭对抗生素的等温吸附特征。结果显示:生物炭对抗生素的吸附量均随pH值的升高先升高后降低,最适pH值为6;生物炭对抗生素的吸附量随着温度升高和离子强度的降低而升高。相同平衡浓度下,生物炭对3种抗生素的吸附符合Langmuir模型,对抗生素的最大吸附量在2.11 mmol/kg~4.78 mmol/kg范围内,吸附能力依次表现为有机-无机复合改性>无机改性>未改性,抗生素被吸附量大小依次为土霉素>四环素>金霉素。The effects of pH value,ionic strength and temperature on the adsorption of antibiotics by organic acid and inorganic acid modified biochar(made from Alteranthera philoxeroides)were analyzed,and the isothermal adsorption characteristics of different biochar to antibiotics were compared under optimal environmental conditions.The results showed that the adsorption capacity of biochar to antibiotics first increased and then decreased with the increase of pH value,and the optimal pH value was 6.The adsorption capacity of biochar to antibiotics increased with the increase of temperature and the decrease of ionic strength.At the same equilibrium concentration,the adsorption of three antibiotics by biochar conformed to Langmuir model,the maximum adsorption capacity of antibiotics ranged from 2.11 mmol/kg to 4.78 mmol/kg,and the adsorption capacity was arranged from large to small as organic acid-inorganic acid modification,inorganic acid modification,no modification,the amount of antibiotics adsorbed was ranked from large to small as oxytetracycline,tetracycline,chlorotetracycline.

关 键 词：生物炭 改性 抗生素 吸附 莲子草 水处理 

分 类 号：TQ424[化学工程] X703[环境科学与工程—环境工程]