摘要
具有γ放射性的^(110m)Ag是核电站放射性废液中的主要核素之一,半衰期长,并且可以通过食物链在海洋生物中富集,研究其高效去除技术具有重要的意义.核电站化学去污过程加入的络合剂(如柠檬酸)对^(110m)Ag的化学形态和吸附性能有重要的影响.因此,本文首先模拟核电站水化学环境,研究了柠檬酸对^(110m)Ag化学形态的影响规律,其次研究了不同形态的^(110m)Ag物种在几种优选材料上的吸附性能.结果表明,由于核电站放射性废液的来源不同,柠檬酸与^(110m)Ag同时形成离子态络合物和^(110m)Ag0/柠檬酸纳米金属复合物;采用过氧化氢与紫外线联合高级氧化的方法能够破坏柠檬酸络合离子及^(110m)Ag0/柠檬酸复合物结构,形成单独的离子态^(110m)Ag+,从而有效地提高了^(110m)Ag物种的吸附去除性能.
Since110mAg,with γ-ray radiation and long radioactive half-life,can be accumulated in marine organisms through the food chain,it is important to study the removal of110 mAg,one of the major radionuclide in radioactive wastewater from nuclear power plant. As a complexing agent,citric acid,a detergent added during the chemical decontamination process in nuclear power plant has a significant influence on both of the chemical species and the adsorption characteristics of110 mAg. In this paper,the influence of citric acid on the110 mAg species was investigated in a simulation hydrochemistry environment of nuclear power plant,and the removal of110 mAg species by varied sorbent was also studied. The results indicate that110mAg＋/（ citric acid）complex and110mAg0/（ citric acid） colloid particles were formed in the presence citric acid in the radioactive wastewater. The efficiency of adsorption removal of110 mAg can be improved apparently by an advanced oxidation process combined hydrogen peroxide oxidation and UV radiation,during which both110mAg＋/（ citric acid） complex and110mAg0/（ citric acid） colloid particles have been converted into ionic state110mAg＋.
出处
《环境科学学报》
CAS
CSCD
北大核心
2016年第9期3213-3221,共9页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.U1332101)
国家能源应用技术研究及工程示范项目(No.NY-20120102-1)
长江学者和创新团队发展计划资助项目(No.IRT-13026)~~
关键词
低放废液处理
110mAg吸附去除
柠檬酸
高级氧化
low-level radioactive wastewater treatment
adsorption removal of110mAg
citric acid
advanced oxidation processes
