蒙脱石对盐酸四环素吸附特性的实验研究  

An experimental study of adsorptive properties of montmorillonite for tetracycline

作　　者：成思敏[1] 吴博扬 杨羽斯 沈大辉 杜巍[1] 谢函芮[1] 吴宏海[1] 

机构地区：[1]华南师范大学化学与环境学院,省部共建教育部环境理论化学重点实验室,广东广州510006 [2]广州市第四十七中学,广东广州510640

出　　处：《岩石矿物学杂志》2013年第6期925-929,共5页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目(41072034;41372050)

摘　　要：基于当前发生的抗生素污染环境严峻问题,本文开展高活性粘土矿物蒙脱石吸附水中盐酸四环素(TC)的实验研究。采用批处理吸附实验方法,着重考查溶液初始TC浓度、初始pH值、电解质的阳离子类型及其浓度等对蒙脱石吸附性能的影响。结果显示,蒙脱石对TC的吸附行为可用Freundlich吸附等温线进行描述,并表现出显著的非线性特征;Langmuir方程确定其最大吸附量为625 mg/g;在较强酸性介质条件下(pH=2～4)蒙脱石对TC的吸附能力最强,其次为弱酸性-弱碱性环境(pH=5～9);不同阳离子类型也能显著影响蒙脱石对TC的吸附,表现为阳离子价态越高,对TC吸附的影响程度越明显。蒙脱石可被认为是一种TC的高效吸附剂,应用于盐酸四环素污染废水的处理过程。As there exists the serious problem of environmental pollution caused by antibiotics at present,the experimental research on the adsorption of montmorillonite （Mt）,a highly active clay mineral,for tetracycline （TC） from aqueous solutions was carried out in this paper.Batch adsorption experimental methods were used to make the investigation with the emphasis placed on the influences of initial TC concentration,initial pH as well as cation types of electrolytes and their concentrations on the adsorption properties of Mt for TC.The results show that the adsorption behavior of Mt for TC can be well described with Freundlich isotherm,and the maximum adsorption capacity calculated by the Langmuir equation was 625 mg/g; however,the strongest adsorption of TC on Mt may occur under the condition of higher acidic medium pHs （pH =2～ 4）,followed by weak acidicweak basic pHs from 5 to 9.In addition,varying types of cations can obviously affect the adsorption capabilities of Mt,suggesting that the higher their state of valence,the more evident the impact extent of TC adsorption.Mt is therefore a highly efficient adsorbent and can be applied to the treatment process of TC wastewater.

关 键 词：蒙脱石 盐酸四环素 吸附 电解质 溶液PH值 

分 类 号：P579[天文地球—矿物学] P578.967[天文地球—地质学]