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首页> 外文期刊>Separation and Purification Technology >Development of adsorption and solidification process for decontamination of Cs-contaminated radioactive water in Fukushima through silica-based AMP hybrid adsorbent
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Development of adsorption and solidification process for decontamination of Cs-contaminated radioactive water in Fukushima through silica-based AMP hybrid adsorbent

机译：基于二氧化硅的AMP杂交吸附剂，在福岛CS污染放射性水去污吸附和凝固过程的发展

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Developing highly efficient cesium (Cs) adsorbent and a stable solidification method for Cs is vital for the advancement of the decontamination system for Fukushima Daiichi Nuclear Power Plant. A novel porous silica loaded with ammonium molybdophosphate (AMP/SiO2) was prepared through impregnation/preci pitation/freeze-drying method. The composite with 32.4 wt% AMP loading amount had superior large 254.2 angstrom pore width and 72.2 m(2)/g surface area. The Cs-137 removal efficiency in actual seawater was 97.1% within 30 min, indicating that AMP/SiO2 effectively treated contaminant water with low-level concentration of Cs even in the presence of highly concentrated competing ions. The AMP/SiO2 adsorption of Cs-137 in seawater conformed well with Redlich-Peterson model. The ion exchange ratio of Cs+ and NH4+ in AMP was estimated to be 71% from the equivalent of Cs2NH4MP. Pyrogenetic AMP/SiO2-absorbed Cs (Cs-AMP/SiO2) was decomposed above 400 degrees C sintering temperature, and Cs immobilization (%) decreased from 100% to 40% after sintering at 1200 degrees C; porous silica support matrix had no immobility for Cs. In contrast, adding natural mordenite (NM) can depress the volatilization of Cs, resulting to the steady immobilization ratio of Cs at nearly 100% for the sintered products. The crystal phase immobilizing Cs was identified as Cs4Al4Si20O48 through X-ray diffractometry. The Cs leachability from the sintered products was less than 0.1% even at 90 degrees C in distilled water and 0.1 M sodium chloride. (C) 2017 Elsevier B.V. All rights reserved.
机译：开发高效的铯（Cs）吸附剂和Cs的稳定凝固方法对于福岛帝素核电站的去污系统的进步至关重要。通过浸渍/预型突出/冷冻干燥方法制备装有钼磷酸铵（AMP / SiO 2）的新型多孔二氧化硅。具有32.4wt％AMP加载量的复合材料具有优异的254.2埃孔宽度和72.2M（2）/ g表面积。在30分钟内，实际海水中的CS-137去除效率为97.1％，表明，即使在高度浓缩的竞争离子存在下，AMP / SiO 2也有效地处理了低水平浓度的Cs。与雷尔里希 - 彼得松模型符合海水中CS-137的AMP / SiO 2吸附。从CS2NH4MP的相当于CS2NH4MP，额外的Cs +和NH 4 +的离子交换比估计为71％。发热AMP / SiO 2吸收的Cs（CS-AMP / SiO 2）在400℃的烧结温度以上分解，Cs固定化（％）在1200℃下烧结后的100％至40％降低;多孔二氧化硅支持基质对Cs不起作用。相比之下，添加天然丝硝（NM）可以抑制Cs的挥发，导致Cs的稳定固定比为烧结产物的近100％。将晶相固定Cs通过X射线衍射法鉴定为CS4Al 4 Si 4 O 48。烧结产物的CS可渗透性均匀于蒸馏水和0.1米氯化钠的90℃下小于0.1％。 （c）2017 Elsevier B.v.保留所有权利。

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