冻融作用下黄土对多环芳烃的吸附特性研究  

Adsorption Characteristics of Loess to Polycyclic Aromatic Hydrocarbons under Freeze-Thaw Action

作　　者：王德华 陆妍 韩志勇[1] 杨麒 熊青月 魏新鹏 王子暄 WANG Dehua;LU Yan;HAN Zhiyong;YANG Qi;XIONG Qingyue;WEI Xinpeng;WANG Zixuan(School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Sichuan Chengdu Sales Branch of PetroChina Company Limited,Chengdu 610046,China;Weifang Xiashan Reservoir Management Service Center,Weifang 261325,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050 [2]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000 [3]中国石油天然气股份有限公司四川成都销售分公司,四川成都610046 [4]潍坊市峡山水库管理服务中心,山东潍坊261325

出　　处：《化学与生物工程》2025年第4期12-20,共9页Chemistry & Bioengineering

基　　金：国家自然科学基金项目(42001069);中国科学院西北生态环境资源研究院青年基金项目(FEYS2019007)。

摘　　要：以16种优控多环芳烃(PAHs)混合物为研究对象、兰州黄土为吸附剂,通过室内冻融条件下的批量吸附平衡实验,探究了冻融作用对土壤-水体系中PAHs吸附行为的影响。结果表明,冻融作用改变了黄土对PAHs混合物及单体的吸附行为;吸附未平衡时,冻融黄土对PAHs混合物及中、低环PAHs单体的吸附量总体低于未冻融黄土;而吸附达到平衡后,冻融黄土对其吸附量则总体高于未冻融黄土,这与冻融作用改变了土壤团聚体、有机质的含量有关;冻融黄土对PAHs的吸附等温线与未冻融黄土相比,变化趋势较为平缓,随着溶液平衡浓度的增加,冻融黄土对PAHs的平衡吸附量较未冻融黄土降低更为明显,且对低环PAHs平衡吸附量的降幅大于对高环PAHs的;冻融黄土与未冻融黄土对PAHs的吸附更符合线性模型和Freundlich模型。Using mixture containing 16 kinds of priority controlled polycyclic aromatic hydrocarbons(PAHs)as a research object and Lanzhou loess as a adsorbent,we investigated the effects of the freeze-thaw action on the adsorption behavior of PAHs in soil-water system by batch adsorption equilibrium experiments under freeze-thaw conditions.The results show that the freeze-thaw action changes the adsorption behavior of loess to PAHs mixture and monomers.When the adsorption is not in equilibrium,the adsorption amounts of the PAHs mixture and the medium-and low-ring PAHs monomers by freeze-thawed loess are lower than those by unfreeze-thawed loess,while the adsorption amounts of the PAHs mixture and the medium-and low-ring PAHs monomers by freeze-thawed loess are generally higher than those by unfreeze-thawed loess when adsorption is in equilibrium,which is related to the change of the contents of soil aggregates and organic matter under freeze-thaw action.The adsorption isotherm of PAHs by freeze-thawed loess shows a relatively gentle trend compared to unfreeze-thawed loess.As the equilibrium concentration of the solution increases,the equilibrium adsorption amount of PAHs by freeze-thawed loess decreases more significantly than that by unfreeze-thawed loess,and the decrease trend of the equilibrium adsorption amount for low-ring PAHs is greater than that for high-ring PAHs.The adsorption of PAHs by freeze-thawed loess and unfreeze-thawed loess are more consistent with linear and Freundlich models.

关 键 词：多环芳烃 冻融作用 吸附 兰州黄土 

分 类 号：X53[环境科学与工程—环境工程]