摘要
为吸附处理抗生素污染水体,以蒙脱石为吸附剂进行2种四环素类抗生素（四环素和土霉素）的静态吸附试验,考察平衡时间、初始浓度、pH值、阳离子种类与强度等对吸附性能的影响。结果表明,蒙脱石对四环素和土霉素的吸附可划分为初始快速吸附阶段和随后缓慢吸附阶段,符合二级动力学方程,吸附速率常数分别为0.206 g·mg-1·h-1和0.099 g·mg-1·h-1;吸附等温线均能较好地符合Freundlich方程和Langmuir方程,最大吸附量（Qm）分别为313 mg·g-1和189 mg·g-1;在强酸性条件（pH值为2~3）下吸附能力最强,其次为中性-弱碱条件;随着Ca2＋离子浓度升高,蒙脱石对四环素和土霉素的吸附作用逐渐减弱。因此,本研究获得了能同时高效吸附四环素和土霉素蒙的吸附剂,为四环素类污染水体的吸附处理提供了科学依据。
Aiming at the removal of antibiotics in water,a static adsorption experiment was conducted to investigate the influences of equilibrium time,initial concentration,pH value,and cation species on adsorption of two kinds of tetracycline antibiotics（tetracycline and oxytetracycline） by montmorillonite.Results show that the adsorption process of tetracycline and oxytetracycline by montmorillonite could be divided into the initial fast adsorption stage and the slow adsorption stage,which follow pseudo-second-order kinetic equation with adsorption rate of 0.206 g·mg-1·h-1 for tetracycline and 0.099 g·mg-1·h-1 for oxytetracycline,respectively.Adsorption isotherms of tetracycline and oxytetracycline with montmorillonite can be well described by both Freundlich equation and Langmuir equation,with the maximum adsorption capacities（Qm） of 313 mg·g-1and 189 mg·g-1,respectively.The maximum adsorption capacities of tetracycline and oxytetracycline on montmorillonite could be obtained when pH value is 2~3,followed by pH value from 7 to 9.Adsorption capacity of tetracycline and oxytetracycline on montmorillonite decreases with the increase of Ca2＋ concentrations.This research provides an effective sorbent which can simultaneously adsorb tetracycline and oxytetracycline and provides the scientific basis for the adsorption and removal of tetracycline antibiotics in water by montmorillonite.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2011年第3期524-528,共5页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金项目(30671208
40773062)
中央高校基本科研业务费专项资金项目(21610410
21609709)
广东省自然科学基金重点项目(07117909)
广东省科技计划项目(2005B20801002
2006B20601003
2010B020311006)
广东省高校高层次人才项目
东莞市科技研究计划项目(2007108101110)
惠州市科技研究计划项目(2009B010001009)
广州市科技计划项目(10A82070466)
关键词
四环素类抗生素
蒙脱石
吸附
动力学
去除
tetracycline antibiotics
montmorillonite
adsorption
kinetics
removal
