摘要
基于静态吸附实验对土壤吸附三氯乙烯的影响因素进行研究,通过利用有机质含量为0.96%的土样及经375℃、600℃、次氯酸钠和联合氧化方法(600℃+次氯酸钠)处理后的土样为吸附剂,考察了各种土样吸附TCE的吸附动力学和吸附热力学,以及土壤中有机质含量、软碳、硬碳、矿物质、TCE初始浓度和钙离子强度对吸附作用的影响.结果表明,土壤对TCE的吸附分为快速吸附、慢速吸附和平衡3个阶段,并在30 h左右达到吸附平衡,且吸附过程符合准二级动力学方程(R^2>98%);Freundlich模型能较好地拟合TCE在土壤中的吸附等温曲线(R^2>93%);土壤对TCE的吸附以物理吸附为主,其中吸附贡献主要为硬碳(>60%);TCE浓度的升高可以增加矿物质的吸附贡献率;离子强度的增加显著降低了土壤各组分对TCE的吸附.
Based on static adsorption experiment,the effect factors of trichloroethylene adsorbed by soil was studied,using of the organic matter content was 0.96%of the soil samples and 375℃,600℃,sodium hypochlorite and joint oxidation method(600℃+sodium hypochlorite)treated soil samples as adsorbent.the various soil adsorption of TCE adsorption kinetics and adsorption thermodynamics,and soil organic matter content,soft carbon,hard carbon,minerals,initial concentration of TCE and ionic strength on the influence of adsorption were examined.The results showed that the soil adsorption of TCE was divided into three stages:fast adsorption,slow adsorption and equilibrium adsorption,and reached the adsorption equilibrium around 30 h,and the adsorption process was fitted with the pseudo second order kinetic equation(R^2>98%).The Freundlich model can well fit the adsorption isothermal curve of TCE in soil(R^2>93%).The adsorption of TCE by soil was mainly physical adsorption,and the adsorption contribution was mainly hard carbon(>60%).The increase of TCE concentration could increase the contribution rate of mineral adsorption.The increase of ion strength significantly reduced the adsorption of TCE by soil components.
作者
崔立莉
陈浩
李雷
郭旖琪
叶正芳
CUI Lili;CHEN Hao;LI Lei;GUO Yiqi;YE Zhengfang(College of Energy and Environment Engineering,Hebei University of Architecture and Engineering,Zhangjiakou,075000,China;Department of Environmental Science and Engineering,Peking University,The Key of Water and Sediment Sciences,Ministry of Education,Beijing,100871,China)
出处
《环境化学》
CAS
CSCD
北大核心
2020年第1期110-118,共9页
Environmental Chemistry
基金
北京市科技计划项目(Z151100000915065)
河北省重点研发计划自筹项目(17273614)
河北建筑工程学院项目(B201301,XB201829)资助.
关键词
三氯乙烯
吸附
有机质
矿物质
土壤
trichloroethylene
adsorption
organic matter
minerals
soil
作者简介
通讯联系人:叶正芳,Tel:010 62769532,E mail:1006378320@pku.edu.cn
