摘要
湖南锡矿山地区的采矿活动使当地水土锑污染严重﹒基于此,本文采用吸附等温和吸附动力学实验方法,结合红壤土基本理化性质,阐明了不同浓度、温度、时间、pH值条件下红壤土对Sb(Ⅲ)和Sb(Ⅴ)的吸附特征﹒结果表明:1)随着浓度的增加,红壤土对Sb(Ⅲ)和Sb(Ⅴ)的吸附量先增加后趋于平稳﹒2)Langmuir模型能更好地描述红壤土对Sb(Ⅲ)和Sb(Ⅴ)的吸附,且吸附过程为发生在均匀表面的单层化学吸附﹒3)吸附动力学拟合结果显示,红壤土在高温时吸附效果好,其对Sb(Ⅲ)和Sb(Ⅴ)的吸附反应迅速阶段分别在0~110和0~90 min,且二者的吸附效果差异与Sb离子在吸附剂表面电位以及界面扩散有关;其对Sb(Ⅲ)的吸附均能被准一级动力学方程和准二级动力学方程较好地拟合;其对Sb(Ⅲ)的吸附既有物理扩散也有化学吸附,对Sb(Ⅴ)的吸附主要为化学吸附﹒4)pH值增加不利于红壤土对Sb(Ⅲ)和Sb(Ⅴ)的吸附.
The mining activities in the Xikuangshan area of Hunan Province have caused serious antimony contamination.The adsorption characteristics of Sb(Ⅲ)and Sb(Ⅴ)by red loam soil under the conditions of different concentrations,temperature,time and pH were studied by using adsorption isothermal method and adsorption kinetic method,combined with the physicochemical properties of red loam soil.The results show that:1)with the increase of concentration,the adsorption capacity of Sb(Ⅲ)and Sb(Ⅴ)by red loam soil increased at first and then became stable.2)Langmuir model can better describe the adsorption of Sb(Ⅲ)and Sb(Ⅴ)by red loam soil,and the adsorption process is monolayer chemical adsorption on homogeneous surface.3)The fitting results of adsorption kinetics show that the adsorption effect of red loam soil is better at high temperature,and the rapid stage of adsorption of Sb(Ⅲ)and Sb(Ⅴ)is ranged from 0 to 110 min and 0 to 90 min,respectively,and the differences in the adsorption effect of Sb(Ⅲ)and Sb(Ⅴ)are related to the surface potential of antimony ions on the adsorbent as well as the interfacial diffusion.The adsorption of Sb(Ⅲ)can be well fitted by quasi-first-order kinetic equation and quasi-second-order kinetic equation,the adsorption of Sb(Ⅲ)is both physical diffusion and chemical adsorption,and the adsorption of Sb(Ⅴ)is mainly chemical adsorption.4)The increase of pH value is not conducive to the adsorption of Sb(Ⅲ)and Sb(Ⅴ)by red loam soil.
作者
黄冬林
任伯帜
HUANG Donglin;REN Bozhi(Hunan University of Science and Technology,School of Civil Engineering,Xiangtan,Hunan 411100,China;Hunan University of Science and Technology,Key Laboratory of Shale Gas Resources Utilization in Hunan Province,Xiangtan,Hunan 411100,China)
出处
《湖南城市学院学报（自然科学版）》
CAS
2023年第5期67-72,共6页
Journal of Hunan City University:Natural Science
基金
国家自然科学基金项目(41973078)
湖南省科技厅科研项目(2022SK2073)。
