EE2和BPA在三峡消落带不同水位梯度土壤中的吸附特性  

Adsorption property of 17α-ethinyl estradiol and bisphenol A in soils from the water-level-fluctuation zone of the Three Gorges Reservoir along a water level gradient

作　　者：胡莺[1,2] 孙姣霞 杨清伟[1,2] 梅晓杏 HU Ying;SUN Jiaoxia;YANG Qingwei;MEI Xiaoxing(School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]重庆交通大学水利水运工程教育部重点实验室,重庆400074

出　　处：《中国科技论文》2018年第12期1415-1422,共8页China Sciencepaper

基　　金：国家自然科学基金资助项目(51508057);水利水运工程教育部重点实验室开放基金资助项目(SLK2017B04)

摘　　要：通过吸附动力学和批量平衡试验,研究了17α-乙炔基雌二醇(17α-ethynyl estradiol,EE2)和双酚A(bisphenol A,BPA)在涪陵清溪消落带不同水位梯度土壤(S1:150~155m,S2:155~160m,S3:160~165m,S4:165~170m)中的吸附行为。研究表明,不同水位梯度消落带土壤的有机质、粒径分布等性质各异,对EE2和BPA的吸附特性具有明显差异。准二级动力学模型能很好地描述EE2和BPA在土样中的吸附过程,二者在落干期更长的S3和S4中吸附速率更快。土样对EE2的吸附速率是BPA的1.2~1.5倍。在温度为15、25、35℃时,EE2和BPA的吸附等温线符合Freundlich模型,均表现出吸附非线性。土样对EE2和BPA的吸附能力均与土样有机质含量一致:S1>S2>S3>S4,且对EE2的吸附能力强于BPA。BPA的吸附非线性略强于EE2,两者在S3和S4中吸附非线性强于淹水强度更高的S1和S2。热力学参数ΔG、ΔH和ΔS均小于0,EE2和BPA在消落带土壤中的吸附为自发放热熵减过程,吸附机理以物理吸附为主导。The adsorption behavior of 17α-ethinyl estradiol(EE2)and bisphenol A(BPA)by soils from different elevation gradients of the water-level-fluctuation zone(WLFZ)at Qingxi town of Fulin(S1:150-155 m,S2:155-160 m,S3:160-165 m,S4:165-170 m)was investigated through adsorption kinetics and batch balance test.The results show that the physiochemical properties such as organic matter and grain-size distribution vary apparently among soil samples,eventually influencing the adsorption characteristics of EE2 and BPA in soils.The pseudo-second-order model fits the kinetics of adsorption very well,while both EE2 and BPA exhibit higher adsorption rate in S3 and S4 which is exposed to air longer time.The adsorption rate of EE2 is 1.2-1.5 times as that of BPA.All the sorption isotherms of 15,25,35℃can be well described by Freundlich model,and arenonlinear.For both EE2 and BPA,the adsorption capacity of tested soils decrease in the order of S1>S2>S3>S4.The adsorption capacities of these soils for EE2 are higher than those for BPA.The adsorption of BPA exhibits stronger nonlinearity than that of EE2,while stronger adsorption nonlinearity occurs in S3 and S4 for both EE2 and BPA.Results of thermodynamic calculations indicate that adsorption of EE2 and BPA in tested soils is spontaneous and exothermic,while physical process dominates the adsorption.

关 键 词：环境科学 吸附 消落带 土壤 双酚A 17Α-乙炔基雌二醇 

分 类 号：X131.3[环境科学与工程—环境科学]