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用羧甲基纤维素(CMC)包覆的纳米零价铁(NZVI)来去除溶液中的210Pb(II)。考察溶液的pH值、包覆型纳米零价铁投加浓度、210Pb(II)初始放射性活度以及反应时间等因素对包覆型NZVI/CMC去除溶液中210Pb(II)效果的影响。通过扫描电镜(SEM)和X射线衍射(XRD)对反应前后包覆型NZVI/CMC进行了表征分析。结果表明,当pH值为5.5,包覆型NZVI/CMC投加浓度为0.8 g·L-1,210Pb(II)初始放射性活度为2.354×103 Bq·L-1,反应60 min后210Pb(II)去除率达到99.25%。反应前后包覆型NZVI/CMC的形态发生了较大的改变,其链球状的网状结构变为片状结构。包覆型NZVI/CMC对210Pb(II)仍有较好的去除效果。
210Pb (II) in solution was removed using carboxymethylcellulose (CMC) coated nano-zero valent iron (NZVI). The effect of 210Pb (II) on the coating type NZVI / CMC removal solution was investigated by the pH value of the solution, the dosing concentration of the coated nano-zero iron, the initial radioactivity of 210Pb (II) and the reaction time. The coated NZVI / CMC before and after the reaction was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that when the pH value was 5.5 and the concentration of coated NZVI / CMC was 0.8 g · L-1,210Pb (II), the initial radioactivity was 2.354 × 103 Bq · L -1. After 60 min of reaction, 210Pb ) Removal rate of 99.25%. The morphology of the coated NZVI / CMC changed greatly before and after the reaction, and the chain-like network became sheet-like structure. Coated NZVI / CMC has a better removal of 210Pb (II).