摘要
为探究有机质与矿物质间交互作用对有机-矿质复合体吸附典型药物的影响,并明确其与有机质含量、制备时间之间的关系,以腐殖酸和高岭土分别代表有机质和矿物质、以四环素(TC)为模式药物进行吸附续批实验研究.结果表明,有机-矿质复合体对TC的吸附符合Langmuir和Freundlich等温线.交互作用对于复合体吸附TC具有显著的抑制作用,且抑制作用的强弱与腐殖酸含量和复合体制备时间有关.当腐殖酸含量从0.5%增至1.0%时,负载于高岭土表面的腐殖酸使复合体表面不光滑,交互作用对复合体吸附TC的抑制强度减弱;当腐殖酸含量从1.0%增至2.0%时,其与TC之间出现竞争吸附,交互作用对复合体吸附TC的抑制强度增强;当腐殖酸含量从2.0%增至5.0%时,腐殖酸的强吸附能力抵消了其对高岭土吸附TC的竞争抑制作用,交互作用对复合体吸附TC的抑制强度减弱.制备时间不同时,交互作用通常会抑制复合体对TC的吸附,并且随制备时间增长呈现先增强后减弱的趋势.
In order to explore the effect of interaction between organic matter and mineral on the adsorption of typical pharmaceuticals by organic-mineral complex,and to clarify the relationship between the interaction and the content of organic matter and the preparation time,the adsorption batch experiment was carried out with humic acid and kaolin representing organic matter and mineral respectively,and tetracycline(TC)as model drug.The results showed that the adsorption of TC by organic-mineral complex conforms to the Langmuir and Freundlich isotherms.The interaction had a significant inhibitory effect on the adsorption of the TC by the complex,and the degree of inhibition was related to the content of humic acid and the preparation time of the composite.When the content of humic acid increased from 0.5%to 1.0%,the humic acid loaded on the surface of kaolin made the surface of the complex not smooth,and the inhibition intensity of interaction on the adsorption of TC was weakened.When the content of humic acid increased from 1.0%to 2.0%,there may be competitive adsorption between humic acid and TC,and the inhibition intensity of interaction on TC adsorption was enhanced.When the content of humic increased from 2.0%to 5.0%,strong adsorption capacity of humic acid counteracted its competitive inhibition on the adsorption of TC by kaolin,and the inhibition of interaction on the adsorption of TC by the complex was weakened.When the preparation time is different,the interaction between humic acid and kaolin generally suppressed the adsorption of the TC by the complex,and increased at first and then decreased with the increase in preparation time.
作者
卜庆伟
曹红梅
贺小凡
郑泽鹏
余刚
BU Qingwei;CAO Hongmei;HE Xiaofan;ZHENG Zepeng;YU Gang(School of Chemical&Environmental Engineering,China University of Mining&Technology-Beijing,Beijing,100083,China;School of Environment,Tsinghua University,Beijing,100084,China)
出处
《环境化学》
CAS
CSCD
北大核心
2020年第12期3552-3561,共10页
Environmental Chemistry
基金
国家自然科学基金(21777188,21707010)
中国矿业大学(北京)“越崎青年学者”计划(2017QN15)资助
关键词
交互作用
吸附
腐殖酸
高岭土
四环素
interaction
adsorption
humic acid
kaolin
tetracycline
