Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, China; Beijing Key Laboratory of Radioactive Wastes Treatment, Tsinghua University, Beijing 100084, China.
Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, China; Beijing Key Laboratory of Radioactive Wastes Treatment, Tsinghua University, Beijing 100084, China.
J Hazard Mater. 2021 Jun 5;411:125117. doi: 10.1016/j.jhazmat.2021.125117. Epub 2021 Jan 13.
In this study, a novel adsorbent, polyvinyl alcohol/graphene oxide/MnO composite was prepared, characterized and used for efficient removal of Co and Sr from aqueous solution. Polyvinyl alcohol (PVA) and Mn played a synergistic role in the gelation of PVA/GO/Mn, while Mn can be further converted into oxide to achieve functionalized aerogel (PVA/GO/MnO). The spectroscopy analysis manifested that hydrogen bonds and electrostatic attraction were responsible for the formation of PVA/GO/MnO. The functionalization of MnO enhanced the adsorption capacity for Co (2.1 folds) and Sr (1.3 folds) by PVA/GO/MnO. The composite showed high adsorption capacity at broad pH range of 4.0-9.0. For competitive adsorption test, Ni/Zn exerted the most interfering effect on Co adsorption, while Mg/Ca showed severe interfering effect on Sr adsorption. Both electrostatic attraction and oxygen-containing groups contributed to the adsorption mechanism. This study may provide a new adsorbent for separation of Co and Sr from aqueous solution.
在这项研究中，制备了一种新型吸附剂——聚乙烯醇/氧化石墨烯/氧化锰复合材料，对其进行了表征，并用于从水溶液中高效去除钴和锶。聚乙烯醇（PVA）和 Mn 在 PVA/GO/Mn 的胶凝过程中发挥协同作用，而 Mn 可以进一步转化为氧化物，从而实现功能化气凝胶（PVA/GO/MnO）。光谱分析表明，氢键和静电吸引是形成 PVA/GO/MnO 的原因。MnO 的功能化增强了 PVA/GO/MnO 对 Co（提高了 2.1 倍）和 Sr（提高了 1.3 倍）的吸附能力。该复合材料在 pH 值为 4.0-9.0 的较宽范围内表现出高吸附容量。对于竞争吸附试验，Ni/Zn 对 Co 的吸附有最大的干扰作用，而 Mg/Ca 对 Sr 的吸附有严重的干扰作用。静电吸引和含氧基团都有助于吸附机理。本研究可为从水溶液中分离 Co 和 Sr 提供一种新型吸附剂。
