对二甲苯在土壤不同粒径组分上的吸附-解吸行为研究  

Study on Adsorption-desorption Behavior of Paraxylene on Soil with Different Particle Size Components

作　　者：梅皓天 郑吉 陈胤再 夏枫 MEI Hao-tian;ZHENG Ji;CHEN Yin-zai;XIA Feng(Ningbo Research Institute of Ecological and Environmental Sciences,Zhejiang Ningbo 315012,China)

机构地区：[1]宁波市生态环境科学研究院,浙江宁波315012

出　　处：《广州化工》2024年第8期71-74,共4页GuangZhou Chemical Industry

摘　　要：通过粒径分级将水稻土分成3种不同粒径组分,采用批实验研究了对二甲苯在不同粒径组分上的吸附解吸行为。结果表明,不同粒径组分对对二甲苯的吸附速率随着粒径减小而增大,最大吸附容量随着粒径增大而减小。吸附热力学实验表明对二甲苯在不同粒径组分中的吸附和解吸均可以用线性模型较好的拟合(R^(2)>0.99),且随着土壤颗粒粒径增大,吸附系数逐渐减小,吸附能力减弱;同时,在解吸过程中不同粒径均存在解吸滞后现象,这主要和土壤颗粒表面的孔隙数量、有机碳含量有关。The paddy soil was divided into three different particle size components by particle size fractionation,and the adsorption-desorption behavior of paraxylene(PX)on different particle size components was studied by batch experiments.The results showed that the adsorption rate of PX of different particle size components increased with the decrease of particle size,and the maximum adsorption capacity decreased with the increase of particle size.Adsorption thermodynamic experiments showed that the adsorption and desorption of PX in different particle size components could be well fitted by linear model(R^(2)>0.99),and with the increase of soil particle size,the adsorption coefficient gradually decreased and the adsorption capacity weakened.In the process of desorption,there is a desorption lag phenomenon in different particle sizes,which is mainly related to the number of pores and organic carbon content on the surface of soil particles.

关 键 词：对二甲苯 粒径分级 吸附 解吸 滞后现象 

分 类 号：X53[环境科学与工程—环境工程]