摘要
研究零价铁粉在不同pH、反应时间、温度等条件下对溶液中U(Ⅵ)的去除效果。结果表明:在酸性条件下,零价铁粉对溶液中U(Ⅵ)的固定效果较好,随着pH的升高,溶液中U(Ⅵ)去除率也随之降低。在溶液初始pH=3,溶液用量为100 mL,(ρU)=20 mg/L,反应3 h,铁粉用量为2 g时,U(Ⅵ)去除率可达98%以上。污染水体中U(Ⅵ)的去除机制为零价铁对U(Ⅵ)的还原沉淀和零价铁腐蚀物对溶液中U(Ⅵ)的吸附沉淀共同作用。
The removal of uranium（Ⅵ） in solution by zero-valent iron at different pH, reaction times and temperatures are studied. The results indicate that the removal effect is better when the pH in solution is below 7, and the removal rate of U（Ⅵ） lowers with the increase of the pH in solution. Under the following conditions, intial pH=3, solution volume of 100 mL, uranium concentration of 20 rag/L, reaction time of 2 h, removal rate of U（Ⅵ） is more than 98%. The removal mechanism of uranium（Ⅵ） is discussed. The immobilization of uranium（Ⅵ） results from the reductive precipitation and adsorptive precipitation by the byproduct.
出处
《铀矿冶》
CAS
2009年第3期155-157,共3页
Uranium Mining and Metallurgy
基金
国家自然科学基金资助(10475038)
关键词
铀
零价铁
还原沉淀
吸附
uranium（Ⅵ）
zero-valent iron
reductive precipitation
adsorption
