摘要
采用液相还原法制备纳米零价铁(nZⅥ)去除溶液中的U(Ⅵ),讨论溶液pH与离子强度、共存阴阳离子和腐殖酸对去除效果的影响,并对nZⅥ进行表征研究,分析纳米零价铁去除U(Ⅵ)的机理。结果表明:纳米零价铁对溶液中的U(Ⅵ)有很好的去除效果,pH值对去除效果有显著影响,而离子强度对纳米零价铁去除U(Ⅵ)几乎没有影响。阳离子对铀的去除有一定的影响,其中Ca^(2+)和Mg^(2+)的影响较大,而Na^+和K^+几乎没有影响。阴离子对纳米零价铁去除U(Ⅵ)也有一定的影响,其影响顺序由大到小依次为NO_3^-、SO_4^(2-)、ClO_4^-、CO_3^(2-)、HPO_4^(2-)。腐殖酸对纳米零价铁去除溶液中U(Ⅵ)在pH≤4.5时有明显的促进作用;当pH>4.5以后,腐殖酸对纳米零价铁去除U(Ⅵ)具有明显的抑制作用。
The nanoscale zero-valent iron(nZⅥ),synthesized in aqueous solutions by reduction method,was used to remove U(Ⅵ) from aqueous solutions.The effects of pH and ion strength,HA,anions and cations on removal of U(Ⅵ)were investigated.The results show that nZⅥ has very good removal efficiency on U(Ⅵ),pH value has obvious effect on removal of U(Ⅵ),but the ion strength has nearly no effect on the removal of U(Ⅵ).Anion has certain effect,Ca^(2+) and Mg^(2+) has obvious effect,but Na~+ and K~+ has no effect.The important influence ordinal of cations on removal of U(Ⅵ) by nZⅥ from big to small are NO3^-,SO4^(2-),ClO4^-,CO3^(2-),HPO4^(2-).The presence of humic acid(HA) enhances observably the removal of U(Ⅵ) by nZVI at pH≤4.5,but reduces the removal of U(Ⅵ) at pH4.5.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2015年第12期3505-3512,共8页
The Chinese Journal of Nonferrous Metals
基金
国家自然基金资助项目(11205030
11465002
41201500
11205031)
江西省教育厅项目(GJJ14478)
核资源与环境省部共建国家重点实验室项目(NRE1320)
关键词
纳米零价铁
离子强度
阴离子
阳离子
腐殖酸
铀
nanoscale zero-valent iron
ionic strength
anion
cation
humic acid
uranium