水体模拟颗粒物对四环素的吸附特性及基本规律  

Adsorption of Tetracycline on Simulated Suspended Particles in Water

作　　者：徐龙凤[1,2] 魏群山 吕强[1,2] 唐立朋 刘亚男 柳建设 XU Long-feng1,2, WEI Qun-shan1,2, LU Qiang 1,2, TANG Li-peng1,2, LIU Ya-nan1,2, LIU Jlan-she1,2(1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China; 2. State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Shanghai 201620, Chin)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]国家环境保护纺织工业污染防治工程技术中心,上海201620

出　　处：《环境科学》2018年第4期1668-1676,共9页Environmental Science

基　　金：国家自然科学基金项目(21277138);中央高校基本科研业务费专项(2232014D3-17)

摘　　要：为了更深入了解水环境中颗粒物对抗生素的吸附规律,选用典型抗生素——四环素(TC)和悬浮态的高岭土模拟天然水体中颗粒物对四环素的吸附过程,探究颗粒物对TC的吸附规律及不同颗粒物投加量、pH、温度和阳离子对颗粒物吸附TC的影响.结果表明颗粒物对TC在混合4 h之前快速吸附,之后单位吸附量随时间较小波动,在12 h后基本达到吸附平衡.在溶液中颗粒物对TC的单位吸附量随着颗粒物投加量的增大而减小;颗粒物对TC抗生素的吸附更符合Langmuir等温吸附规律;颗粒物对TC的吸附在pH=4.5附近达到最大值,强酸(pH<4)或强碱(pH>9)环境均抑制颗粒物对TC的吸附;低价态的阳离子如Na^+、Ca^(2+)(浓度在0.000 1~0.1 mol·L^(-1)范围)等对颗粒物吸附TC均产生抑制作用,且随着离子浓度的增加,抑制作用增强,但三价阳离子的作用却非常特别,如低浓度的Al^(3+)(0.000 1 mol·L-1)会促进吸附作用,随着Al^(3+)浓度增加,促进作用减弱,直到Al^(3+)达到较高浓度(0.01 mol·L^(-1)),又会抑制颗粒物对TC的吸附.综合本实验获得的颗粒物吸附TC的基本特征和规律,可以初步推断:在实际水环境中由于颗粒物对TC的快速吸附和低浓度Al^(3+)的促进作用,TC在水环境和饮用水处理工艺中更易随颗粒物的运动发生同步迁移,颗粒物的归宿主要决定了TC的归宿,如进入天然水体沉积物中或饮用水处理工艺的污泥中,这也进一步揭示了天然水体中沉积物往往易被检出较高含量TC的根本原因.The mechanism of adsorption of a typical antibiotic（ tetracycline,TC） on particles in the aquatic environment and the parameters affecting adsorption were investigated. Experiments were conducted to elucidate the effects of pH and various cation species with different concentrations. The results show that the adsorption of TC on particles is rapid during the first four hours in the mixing stage. The adsorption process becomes slow after the first four hours. The adsorption of TC on particles can be described well by a Langmuir equation. The maximum adsorption of TC on particles occurs at pH 4. 5,however it is reduced by strongly acidic（ pH 4）or alkaline（ pH 9） conditions. Moreover,the adsorption process is also inhibited by various cations（ e. g. Na＋and Ca^2＋） in the range of 0. 000 1-0. 1 mol·L^-1 ionic concentrations. A special finding concerns Al^3＋ ions; at a low concentration of these ions（ 0-0. 000 1 mol·L^-1） the adsorption of TC on particles improves,whereas at increased concentrations the adsorption is weakened. In summary,an effective removal of the particles is critical to control TC pollution in natural waters because of the rapid adsorption of TC on particles.

关 键 词：四环素 高岭土 吸附 阳离子 等温吸附 

分 类 号：X131.2[环境科学与工程—环境科学]