摘要
采用液相还原法制备了纳米零价铁(n ZVI),并将其用于富集溶液中的Th(Ⅳ)。探讨了溶液pH值、离子强度、反应时间、温度及固液比对nZVI富集Th(Ⅳ)的影响。结果表明:nZVI对溶液中的Th(Ⅳ)有很好的富集效果,富集过程受溶液pH值和离子强度的强烈影响,pH≤4.5时分配系数随pH值的增大而显著增大,随离子强度的增加而减小,pH>4.5以后,保持较高水平而不再随pH值和离子强度的增加而变化。分配系数随温度的升高而增大,说明升温有利于反应的进行。
Nanoscale zero-valent iron （nZVI） was reduction method, and was used to enrich Th（IV） of pH, ionic strength, contact time, temperature synthesized in aqueous solutions by from aqueous solutions. The effects and ratio of solid to solution on the enrichment of Th （Ⅳ） were investigated. The results show that nZVI has very good enrichment efficiency on Th（Ⅳ）, and pH and ionic strength have obvious effect on the enrichment process. The distribution coefficient increases with pH and decreases with ionic strength at pH≤4.5. The distribution coefficient doesn＇t change with the increase of pH and ionic strength at pH〉4.5. The distribution coefficient increases with tem- perature which indicates that increasing temperature is advantageous to the enrichment of Th（Ⅳ） by nZVI.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2017年第6期975-980,共6页
Atomic Energy Science and Technology
基金
国家自然科学基金资助项目(11205030
11465002
41562011
41201500
11205031
21501025)
江西省教育厅资助项目(GJJ14478
GJJ150607
KJLD13054)
江西省教育厅科技落地计划资助项目(KJLD13054)
核资源与环境省部共建国家重点实验室资助项目(NRE1608
Z201406)
关键词
纳米零价铁
钍
富集
分配系数
nanoscale zero-valent iron
thorium
enrichment
distribution coefficient
作者简介
李小燕（1974-），女，甘肃镇原人，副教授，博士，从事辐射防护与核安全研究
