天然黏土矿物对土霉素吸附特性及机理研究
Study on the Adsorption Characteristics and Mechanism of Oxytetracycline by Natural Clay Minerals
DOI: 10.12677/AEP.2023.132039, PDF,    科研立项经费支持
作者: 丁炜轩, 郭嘉钰, 孔维晨, 王文静, 蒋煜峰*：兰州交通大学环境与市政工程学院，甘肃 兰州
关键词: 土霉素；天然黏土；吸附；解吸；吸附滞后；Oxytetracycline； Natural Clay； Adsorption； Desorption； Adsorption Hysteresis
摘要: 为了探究天然黏土矿物对四环素类兽药抗生素的吸附行为及机理，选取土霉素(OTC)为目标污染物，采用批平衡法，分析土霉素在蒙脱土和高岭土上的吸附动力学、热力学以及相关影响因素(初始浓度、温度、离子强度)对吸附过程的影响。结果显示，三种浓度土霉素在蒙脱土和高岭土上的吸附进程分为快吸附阶段(0~10 min)、慢吸附阶段(10 min~30 min)直至平衡，平衡时间分别是0.5 h和1 h，高岭土对土霉素的吸附量要高于蒙脱土，土霉素在两种土壤上的吸附动力学均符合准二级动力学模型。土霉素在高岭土上的解吸量小于蒙脱土，土霉素在土壤上的解吸迟滞系数HI均小于0.7，其解吸速率均小于吸附速度，为正的吸附滞后作用，且土霉素浓度越高，在土壤中的解吸速率越慢。温度升高有利于土霉素在高岭土上吸附，但不利于其在蒙脱土上的吸附。25℃为蒙脱土吸附土霉素最适温度。土霉素在两种黏土上的吸附均符合Freundlich模型。土霉素在高岭土上的n值大于1，表明土霉素在高岭土上吸附较易进行。土霉素在高岭土上吸附的KF值大于蒙脱土，说明高岭土对土霉素的吸附能力更强。加入Na+与Ca2+均会抑制土霉素在黏土上的吸附，浓度越高抑制程度越强，且Ca2+的抑制作用要强于Na+。研究结果表明天然黏土矿物在土壤对四环素类抗生素吸附中有重要的贡献。
Abstract: In order to explore the adsorption behavior and mechanism of tetracycline antibiotics on natural clay, oxytetracycline (OTC) was selected as the target pollutant, andbatch equilibrium method was used to analyze the adsorption kinetics and thermodynamics of oxytetracycline on montmorillonite and kaolin, as well as the influencing factors (initial concentration, temperature and ionic strength) on the adsorption process. The results showed that the adsorption process of three concentrations of oxytetracycline on montmorillonite and kaolin was divided into fast adsorption stage (0~10 min), slow adsorption stage (10~30 min), until equilibrium stage, and the equilibrium time was 0.5 h and 1 h, respectively. The adsorption capacity of kaolin for OTC was higher than that of montmorillonite. The adsorption kinetics of OTC on the two soils were consistent with the pseudo-second-order kinetics model. The desorption capacity of oxytetracycline on kaolin is less than that of montmorillonite, and the desorption hysteresis coefficient of OTC on soil HI is less than 0.7, and the desorption rate is less than the adsorption rate, which is a positive hysteresis effect, and the higher the concentration of OTC, the slower the desorption rate in soil. Increasing temperature is beneficial to the adsorption of OTC on kaolin, but not conducive to its adsorption on montmorillonite. 25˚C was the optimum temperature for adsorption of OTC by montmorillonite. The adsorption process of OTC on the two natural clays was consistent with Freundlich model, and the adsorption of OTC on kaolin could also be fitted by Langmuir model. The n value of OTC on kaolin is greater than 1, indicating that the adsorption of OTC on kaolin is easier. The KF value of OTC adsorbed on kaolin is higher than that of montmorillonite, indicating that kaolin has stronger adsorption capacity for OTC. Both Na+ and Ca2+ can inhibit the adsorption of OTC on natural clay. The higher the concentration is, the stronger the inhibition degree is, and the inhibition effect of Ca2+ is stronger than that of Na+. Our result suggested that adsorption of OTC on natural clay may have key contribution on soil adsorption for tetracycline antibiotics.
文章引用：丁炜轩, 郭嘉钰, 孔维晨, 王文静, 蒋煜峰. 天然黏土矿物对土霉素吸附特性及机理研究[J]. 环境保护前沿, 2023, 13(2): 291-301. https://doi.org/10.12677/AEP.2023.132039

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