摘要
引言随着全球核能事业的不断发展,核燃料主要是铀的需求不断加大,在铀矿采冶过程中产生带有天然放射性核素如铀、钍、镭等放射性废水的量也在逐年增加,废水中的铀既有放射性,又有高的化学毒性,在环境中对人体健康和生态平衡造成严重威胁,世界各国高度重视铀矿采冶过程中产生的放射性废水处理技术的发展和应用。吸附法是一种很有潜力的方法,能克服传统方法的诸多不足。
The corncob was microwave-assistedly modified by KMnO4 and used for adsorption of U（Ⅵ）ions from aqueous solution.The kinetics and thermodynamics of their adsorption were measured using batch experiments.The results show that the kinetics of adsorption follows well the pseudo-second order equation,indicating that the uranium adsorption by the modified corncob is mainly chemisorption.The Langmuir,Freundlich and D-R isothermal adsorption models were used to relate the equilibrium data,finding that Langmuir isotherm of monolayer adsorption is better fitting them,pointing out that the adsorption mainly occurs on surface active sites of modified corncob.The values of apparent activation energy Ea and average adsorption energy Es support also the suggestion that adsorption of U（Ⅵ） on modified corncob is mainly chemisorption,although some physical adsorption can not be got rid of.The thermodynamic parameters（ΔH,ΔS and ΔG）calculated from the adsorption isotherms at various temperatures indicated that the adsorption of U（Ⅵ）on modified corncob is an endothermic,spontaneous process and more favorable at higher temperature.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2012年第12期4068-4074,共7页
CIESC Journal
基金
国家自然科学基金项目(41162007
11205030)
核资源与环境省部共建国家重点实验室培育基地项目(101111)
放射性地质勘探与技术国防重点学科实验室项目(2011RGET06)~~
关键词
高锰酸钾
改性
玉米芯
铀
吸附
potassium permanganate
modification
corncob
uranium
adsorption
作者简介
联系人：李小燕（1974-），女，博士研究生，讲师。
