微生物腐败物对U(VI)的吸附动力学与热力学研究  

Adsorption Kinetics and Thermodynamics Analysis of U(VI)by Microbial Putrefaction

作　　者：邓晨阳 吕俊文 陈子宇 DENG Chenyang;LÜJunwen;CHEN Ziyu(School of Resource Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China;Hengyang Key Laboratory of Soil Contamination Control and Remediation, Hengyang, Hunan 421001, China)

机构地区：[1]南华大学资源环境与安全工程学院,湖南衡阳421001 [2]衡阳市土壤污染控制与修复重点实验室,湖南衡阳421001

出　　处：《南华大学学报（自然科学版）》2021年第3期1-6,56,共7页Journal of University of South China：Science and Technology

基　　金：国家自然科学基金资助项目(11275029)。

摘　　要：为了解微生物腐败物对U(VI)的作用,通过扩大培养微生物,令其自然死亡腐败,制备了微生物腐败物。通过静态实验,对不同pH、反应时间、温度和铀初始质量浓度对微生物腐败物吸附铀的影响进行了研究,并进行了动力学和热力学分析。结果表明,pH、反应温度和铀初始质量浓度均是影响吸附的重要因素,吸附量随着铀初始质量浓度的增加而增加,反应在pH=4,温度为30℃时吸附效果最佳,吸附量为11.922 mg/g,吸附平衡时间为90 min。微生物腐败物对U(VI)的吸附动力学符合准一级动力学模型,表明吸附过程以物理吸附为主。吸附热力学研究发现其对U(VI)吸附过程符合Freundlich等温线模型,表明吸附作用过程主要为从外层扩散到内层的多层吸附。Microbial putrefaction were made by expanding and cultivating microorganisms which naturally died for studying the interaction between microbial putrefaction with U(VI).In bath experiments,the effects of different pH,reaction time,temperature and initial uranium concentration on the adsorption of uranium by microbial putrefaction were studied,and kinetic and thermodynamic analysis were carried out.The results showed that pH,reaction temperature and initial concentration of uranium were important factors for adsorption.The amount of adsorption increased with the increase of the initial uranium concentration.The adsorption effect achieved best when pH=4 and the temperature was 30℃.The adsorption amount was 11.922 mg/g,adsorption equilibrium time was 90 min.The adsorption kinetics of microbial putrefaction conformed to the quasi-first-order kinetic model,indicating that the adsorption process was mainly physical adsorption.The study of adsorption thermodynamics found that the adsorption process conformed to the Freundlich isotherm model,showing that the adsorption process was multilayer adsorption from the outer layer to the inner layer.This study can provide a theoretical basis for further research on the migration of uranium carried by microbial putrefaction in soil and groundwater.

关 键 词：微生物腐败物 铀 动力学 热力学 

分 类 号：X172[环境科学与工程—环境科学]