诺氟沙星在黄河上游沉积物中的吸附/解吸行为及影响因素探究

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摘要选取诺氟沙星(NOR)为目标污染物,以黄河上游沉积物为主要研究对象,采用批平衡方法,研究NOR在沉积物上的吸附/解吸行为,在不同环境条件下(初始浓度、离子强度及类型、pH值、粒径等)对吸附的影响来探究其吸附/解吸规律,结合相关动力学、热力学模型来探究其吸附机制.结果表明:动力学符合准二级动力学模型(R²>0.996),表明吸附和解吸过程均为多种作用控制的复合机制,且解吸有明显的滞后现象.热力学结果显示,Freundlich模型拟合结果最好(R²>0.981),Linear模型次之(R²>0.937),表明非均相表面的多分子层吸附和疏水分配作用均影响NOR在沉积物上吸附行为的关键机制,且温度升高加速NOR在水相的迁移风险.随NOR初始浓度增大,吸附量随之增加,且平衡时间相应延长;pH表现为酸性促进NOR吸附,碱性情况下迁移风险增加;共存可溶性离子对NOR吸附影响结果表明,同种离子共存时,浓度越大,NOR在沉积物上的吸附抑制作用越强;不同共存离子对吸附的影响主要与共存离子特性有关,如离子半径、阳离子交换能力及水解性等,价态的升高,抑制作用越强;粒径越小,吸附量越大.研究结果将为控制黄河上游水体中抗生素类污染物的环境行为及控制提供科学依据.

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	张晓珍
	何蕊
	刘哲炜
	吴嘉丽
	刁静茹
	黄魁
	蒋煜峰

关键词 ：诺氟沙星, 沉积物, 吸附/解吸动力学, 吸附热力学, 影响因素

Abstract：Norfloxacin (NOR) was selected as the target pollutant, and the sediment in the upper reaches of the Yellow River was taken as the main research object. The adsorption/desorption behavior of NOR on the sediment was studied by using the batch balance method. The adsorption/desorption rule was explored under different environmental conditions (initial concentration, ionic strength and type, pH value, particle size, etc.) to explore the adsorption mechanism. The results show that the kinetics is consistent with the quasi-second-order kinetic model (R²>0.996), indicating that the adsorption and desorption processes are complex mechanisms controlled by multiple actions, and the desorption has obvious hysteresis. The thermodynamic results showed that the Freundlich model had the best fitting result (R²>0.981), followed by the Linear model (R²>0.937), indicating that the multimolecular layer adsorption and hydrophobic distribution on heterogeneous surfaces both affected the key mechanism of NOR adsorption behavior on sediments, and the temperature increase accelerated the migration risk of NOR in the water phase. With the increase of NOR initial concentration, the adsorption capacity increases and the equilibrium time prolongates accordingly. The pH showed that acidity promoted NOR adsorption, and the migration risk increased under alkaline condition. The effect of coexisting soluble ions on NOR adsorption results showed that the larger the concentration of the same ions, the stronger the adsorption inhibition of NOR on the sediment. The influence of different coexisting ions on adsorption is mainly related to the characteristics of coexisting ions, such as ion radius, cation exchange capacity and hydrolysis, etc. The higher the valence state, the stronger the inhibition effect. The smaller the particle size, the larger the adsorption capacity. The results of this study will provide scientific basis for controlling the environmental behavior of antibiotic pollutants in the upper reaches of the Yellow River.

Key words： norfloxacin sediments adsorption/desorption kinetics adsorption thermodynamics influence factor

收稿日期: 2023-11-02

PACS:

X142

基金资助:国家自然科学基金资助项目(21966020)

通讯作者: 蒋煜峰,教授,jiangyf7712@126.com E-mail: jiangyf7712@126.com

作者简介: 张晓珍(1996-),女,甘肃秦安人,兰州交通大学硕士研究生,主要从事土壤污染控制与修复.12211077@stu.lzjt.edu.cn.

引用本文:

张晓珍, 何蕊, 刘哲炜, 吴嘉丽, 刁静茹, 黄魁, 蒋煜峰. 诺氟沙星在黄河上游沉积物中的吸附/解吸行为及影响因素探究[J]. 中国环境科学, 2024, 44(7): 4009-4020. ZHANG Xiao-zhen, HE Rui, LIU Zhe-wei, WU Jia-li, DIAO Jing-ru, HUANG Kui, JIANG Yu-feng. Exploration of the adsorption/desorption behavior and influencing factors of norfloxacin in sediments in the upper reaches of the Yellow River. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(7): 4009-4020.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I7/4009

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