摘要
磺胺甲恶唑(SMX)和卡马西平(CBZ)作为水环境中被广泛检出的药用活性化合物,其进入水土环境给生态环境和人体健康带来潜在风险。为探究SMX和CBZ进入不同类型土壤后的吸附行为,本文研究了SMX和CBZ在粉土及细砂两种典型孔隙介质中的吸附动力学、等温吸附特征及溶液pH值、可溶性腐植酸(DHA)和土壤矿物组分三种因素的影响。结果表明:SMX和CBZ在孔隙介质上的吸附均符合Lagergren准二级动力学模型和Langmuir等温吸附模型,具有快速吸附、缓慢平衡的特点,属于单分子层化学吸附。孔隙介质对SMX的吸附属于自发的放热反应,而对CBZ的吸附则是吸热反应。在实验条件下,粒径小、有机质含量高和比表面积较大的粉土对SMX和CBZ的最大吸附量分别是细砂的3.0倍和2.3倍。SMX的吸附主要受矿物表面静电引力和有机质分配作用影响,而CBZ更多受分配作用控制。随溶液pH值升高(pH=5.0~9.0),孔隙介质对主要以阴离子态存在的SMX的吸附量明显下降,而对分子态CBZ的吸附量变化不明显。溶液中DHA(8~50mg/L)的共存对孔隙介质吸附SMX和CBZ具有竞争抑制作用。孔隙介质中蒙脱石和铁氧化物的含量越高,其对SMX和CBZ的吸附能力越强。
Sulfamethoxazole(SMX)and carbamazepine(CBZ)are pharmaceutically active compounds that are frequently detected in aquatic environments.Once they enter the water-soil system,these compounds pose potential risks to the ecological environment and human health.To investigate the adsorption behavior of SMX and CBZ by different soils,the adsorption kinetics,isothermal adsorption characteristics of SMX and CBZ in two typical porous media(silt and fine sand),and the influences of solution pH value,dissolved humic acid(DHA),and soil mineral components were examined.The results show that the adsorption of SMX and CBZ on porous media conformed to both the Lagergren pseudo-second-order kinetic model and the Langmuir isothermal adsorption model,which were characterized by an initial rapid adsorption followed by slow equilibrium.The adsorption process belongs to the monolayer adsorption and is controlled by chemical reaction.The adsorption of SMX by porous media is a spontaneous and exothermic process,while the adsorption of CBZ is an endothermic reaction.Under experimental conditions,the maximum adsorption capacities of silty soil with small particle size,high organic matter content and large specific surface area for SMX and CBZ were 3.0 times and 2.3 times larger than those of fine sand,respectively.The adsorption of SMX was mainly influenced by the electrostatic attraction on mineral surfaces and the partitioning effect of organic matter,while the adsorption of CBZ was dominated by the partitioning effect.With the increase of solution pH value(from 5.0 to 9.0),the adsorption capacity of anionic SMX decreased significantly due to the influence of electrostatic repulsion,while the adsorption capacity of molecular CBZ changed insignificantly.The coexistence of dissolved humic acid(8–50mg/L)in the solution had a competitive inhibitory effect on the adsorption of SMX and CBZ by porous media,while montmorillonite and iron oxides in the porous media had a promoting effect on the adsorption of SMX and CBZ.
作者
张威
张书缘
孔祥科
许瑞峰
韩梅
刘圣华
曾少坚
吴林
ZHANG Wei;ZHANG Shuyuan;KONG Xiangke;XU Ruifeng;HAN Mei;LIU Shenghua;ZENG Shaojian;WU Lin(Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Xiamen 361021,China;Key Laboratory of Groundwater Remediation of Hebei Province and China Geological Survey,Shijiazhuang 050061,China;Fujian Provincial Key Laboratory of Water Cycling and Eco-Geological Processes,Xiamen 361021,China;Xiamen Environmental Monitoring Station,Xiamen 361021,China;College of Water Resources,North China University of Water Resources and Electric Power,Zhengzhou 450046,China)
出处
《岩矿测试》
北大核心
2025年第4期645-657,共13页
Rock and Mineral Analysis
基金
中国地质科学院基本科研业务费青年英才项目(YK202303)
厦门市自然科学基金项目(3502Z20227309)
国家自然科学基金面上项目(4207071759)
中国地质科学院水文地质环境地质研究所基本科研业务费项目(SK202318)。
关键词
磺胺甲恶唑
卡马西平
孔隙介质
吸附
影响因素
sulfamethoxazole
carbamazepine
porous media
adsorption
influencing factor
作者简介
第一作者:张威,硕士,高级工程师,主要从事地下水污染机理与修复方面的研究。E-mail:zw@mail.cgs.gov.cn;通信作者:孔祥科,博士,副研究员,主要从事土壤、地下水污染机理与修复方面的研究。E-mail:kongxiangke@mail.cgs.gov.cn。
