Graphene oxide/chitosan/potassium copper hexacyanoferrate(II) composite aerogel for efficient removal of cesium
Graphene oxide/chitosan/potassium copper hexacyanoferrate(II) composite aerogel for efficient removal of cesium
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DOI：
10.1016/j.cej.2022.136397
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发表时间：
2022-04-28
影响因子：
15.1
通讯作者：
Shi，Weiqun
中科院分区：
文献类型：
--
作者：
Tang，Xiaoyi;Wang，Siyi;Shi，Weiqun
从各种放射性废水和污染环境中有效去除137 Cs对核能可持续发展和公众健康具有重要意义。本文采用壳聚糖（CS）诱导氧化石墨烯（GO）自组装成具有三维大孔结构的水凝胶（GO/CS），并通过简单的浸出法在GO/CS上原位生长六氰合铁酸铜钾（Cu-PBA）纳米粒子，制备了GO/CS/Cu-PBA三元复合水凝胶/气凝胶。系统研究了GO、Cu-PBA和GO/CS/Cu-PBA在不同基质中对Cs+的吸附行为，并进行了比较。结果表明，GO/CS/Cu-PBA对Cs+的吸附容量为64.7 mg/g，吸附动力学超快。此外，固定床柱系统可用于从受污染的地下水中清除Cs+。进一步的FT-IR、XRD、XPS和EXAFS分析阐明了Cs+与GO/CS/Cu-PBA之间的相互作用机理。Cu-PBA对Cs+的高选择性固定伴随着K+/Cu 2+的释放和晶相转变。GO对Cs+的吸附主要与-COO−和C-OH基团的静电吸引作用有关。GO/CS气凝胶对Cu-PBA的包封作用在含铯放射性废水的实际处理中具有很大的应用潜力。
Efficient removal of137Cs from various radioactive wastewater and contaminated environment is much meaningful for nuclear energy sustainable development and public health. Herein we used chitosan (CS) to induce the self-assembly of graphene oxide (GO) into a hydrogel (GO/CS) possessing a three-dimensional macroporous structure and produced a type of ternary composite hydrogel/aerogel named GO/CS/Cu-PBA byin situgrowing potassium copper hexacyanoferrate(II) (Cu-PBA) nanoparticles onto the GO/CSviasimple leaching. The adsorption behaviors of Cs+by GO, Cu-PBA, and GO/CS/Cu-PBA in various matrice was systematically studied and compared. It was found that the GO/CS/Cu-PBA exhibited satisfactory sorption capacity for Cs+(64.7 mg/g) and ultrafast kinetics. In addition, a fixed-bed column system could be employed for the cleanup of Cs+from contaminated groundwater. Further FT-IR, XRD, XPS, and EXAFS analyses clarified the interaction mechanism between Cs+and GO/CS/Cu-PBA. Highly selective fixation of Cs+by Cu-PBA was accompanied by the release of K+/Cu2+and a crystalline phase transition. The adsorption of Cs+by GO was mainly correlated with the electrostatic attraction by –COO−and C-OH groups. The confinement of Cu-PBA by GO/CS aerogel is of much potential for the practical treatment of cesium-containing radioactive wastewater.