3,3',4,4'-四氯联苯在胡敏酸上的吸附动力学研究  

Study on Sorption Kinetics of 3,3',4,4'-tetrachlorobiphenyl onto Humic Acid

作　　者：彭伟[1] 方振东[2] 谯华[3] 史永刚[2] 郝全龙[1] 

机构地区：[1]后勤工程学院研究生管理大队,重庆401311 [2]后勤工程学院训练部,重庆401311 [3]后勤工程学院国防建筑规划与环境工程系,重庆401311

出　　处：《四川环境》2015年第3期18-24,共7页Sichuan Environment

基　　金：总后勤部基建营房部科研项目(CY112C017);浙江省固体废物处理与资源化重点实验室开放课题项目(SWTR-2012-04);后勤工程学院学术创新基金资助项目(YZ11-43301);后勤工程学院研究生创新专项(YZ12-2012-04)

摘　　要：采用间歇法研究了3,3',4,4'-四氯联苯(PCB77)在胡敏酸(HA)上的吸附动力学特征。结果表明,PCB77在HA上的吸附可分为快速吸附和慢速吸附2个阶段,12 h可达到吸附平衡,平衡吸附率为67.71%(液土比为400∶1);采用5种动力学模型拟合动力学曲线,R2(伪二阶动力学模型)>R2(Elovich动力学模型)>R2(双常数模型)>R2(伪一阶动力学模型)>R2(微粒内扩散模型),其中伪二阶动力学模型、Elovich动力学模型和双常数模型拟合的相关系数R2分别为0.9965、0.9464、0.8948,均可以较好的描述吸附过程,表明PCB77在HA上的吸附是一个相当复杂的传质过程,受液膜扩散、表面吸附以及微粒内扩散等多因素共同的控制。研究结果可为降低污染土壤/底泥中PCBs的迁移及扩散提供理论参考。Dynamic characteristics of 3, 3＇, 4, 4＇-tetrachlorobiphenyl adsorbed onto humic acid was studied using the batch process. Dynamic test results showed that the sorption process could be divided into a fast and a slow stage. Sorption equilibrium occurred after 12 h and the equilibrium sorption efficiency was 67. 71% （ solution to soil ratio of 400：1 ） . Fitting results from five adsorption kinetic models showed that a pseudo-second order kinetic model, Elovich model , and double-constants model ac- curately described the sorption process, R^2 were 0. 9965, 0. 9464, 0. 8948 respectively, indicating that PCB-HA sorption was likely a complex mass transfer process which influenced by liquid film diffusion, surface adsorption, and intraparticle diffusion. Results of this study can provide a theoretical basis for the use of exogenous humic acid to reduce the transfer and diffusion of PCBs in PCB-contaminated soils or sediments.

关 键 词：胡敏酸 吸附 PCB77 动力学 

分 类 号：X53[环境科学与工程—环境工程]