Decommissioning Technology Research Division, Korea Atomic Energy Research Institute, 989-111 Daedukdaero, Yuseong, Daejeon, 34057, Republic of Korea.
Decommissioning Technology Research Division, Korea Atomic Energy Research Institute, 989-111 Daedukdaero, Yuseong, Daejeon, 34057, Republic of Korea.
J Hazard Mater. 2019 Jan 15;362:72-81. doi: 10.1016/j.jhazmat.2018.08.064. Epub 2018 Sep 11.
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 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 × 10 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.
一种自生成的、可剥离的水凝胶，其中包含吸附剂，通过吸附来从表面去除放射性铯，从而进行大面积表面去污。将聚乙烯醇（PVA）和接枝苯硼酸的海藻酸钠（PBA-Alg）的两种水性聚合物溶液容易地应用于表面，随后基于 PBA-二醇酯键自生成水凝胶。与可剥离涂层和化学凝胶相比，由于其高弹性，基于 PBA-二醇酯键的水凝胶无需干燥步骤即可轻松从表面剥离，更加实用且节省时间。所得水凝胶对涂漆水泥的 Cs 去除效率为 91.61%，对铝的 Cs 去除效率为 97.505%，对不锈钢的 Cs 去除效率为 94.05%，对水泥的 Cs 去除效率为 53.5%，这比 Decongel 高 2.3 倍，因为水凝胶中的吸附剂具有出色的 Cs 分配系数（3.34×10 mL/g）。此外，通过从用过的水凝胶中简单地磁性分离吸附剂，可以减少放射性废物的产生量，从而降低废物处理成本。因此，我们的水凝胶系统具有很大的潜力，可作为一种新型的、具有成本效益的表面去污剂，用于各种核工业领域，包括核事故或恐怖袭击后的大面积环境修复。
