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首页> 外文期刊>Journal of Hazardous Materials >Enhanced surface decontamination of radioactive Cs by self-generated, strippable hydrogels based on reversible cross-linking
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Enhanced surface decontamination of radioactive Cs by self-generated, strippable hydrogels based on reversible cross-linking

机译：基于可逆交联的自生可剥离水凝胶增强了放射性Cs的表面净化能力

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摘要

A self-generated, strippable hydrogel containing adsorbents was developed to remove the radioactive cesium from surfaces by adsorption for wide-area surface decontamination. Two aqueous polymeric solutions of polyvinyl alcohol (PVA) and phenylboronic-acid-grafted alginate (PBA-Alg) were easily applied to surfaces and subsequently self-generated a hydrogel based on the PBA-diol ester bond. Compared to the strippable coating and chemical gels, the PBA-diol ester bond-based hydrogel was easily peeled off the surfaces without a drying step due to its high elasticity, which is more practical and time saving. The resulting hydrogel displayed high Cs-137 removal efficiencies of 91.61% for painted cement, 97.505% for aluminum, 94.05% for stainless steel, and 53.5% for cement, which was 2.3 times higher than that of Decongel due to the presence of the adsorbent in the hydrogel having an excellent Cs distribution coefficient (3.34 x 10(4) mL/g). Moreover, the volume of radioactive waste generated after the surface decontamination could be reduced by a simple magnetic separation of the adsorbent from the used hydrogel, which can reduce the waste disposal cost. Therefore, our hydrogel system has great potential as a new, cost-effective surface decontaminant in various nuclear industry fields including wide area environmental remediation after a nuclear accident or terrorist attack.
机译：开发了一种自生的，可剥离的，含有吸附剂的水凝胶，通过吸附作用从表面去除放射性铯，以进行大范围的表面净化。聚乙烯醇（PVA）和苯硼酸接枝海藻酸盐（PBA-Alg）的两种聚合物水溶液很容易施涂到表面，然后基于PBA-二醇酯键自生成水凝胶。与可剥离的涂料和化学凝胶相比，基于PBA-二醇酯键的水凝胶由于其高弹性而易于从表面剥离，而无需干燥步骤，因此更加实用且省时。所得水凝胶显示出高的Cs-137去除效率，分别为油漆水泥91.61％，铝97.505％，不锈钢94.05％和水泥53.5％，这是由于吸附剂的存在，它比Decongel高2.3倍。在水凝胶中具有出色的Cs分布系数（3.34 x 10（4）mL / g）。此外，通过简单地将吸附剂与用过的水凝胶进行磁分离，可以减少表面净化后产生的放射性废物的体积，从而可以减少废物处理成本。因此，我们的水凝胶系统在各种核工业领域中都具有巨大的潜力，成为一种新型的，具有成本效益的表面净化剂，包括在发生核事故或恐怖袭击后进行大范围的环境修复。

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