National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, No.1 North 2nd Street, Zhongguancun, Haidian District, Beijing, 100190, People's Republic of China; University of Chinese Academy of Sciences, No.19A Yuquan Road, Shijingshan District, Beijing, 100049, People's Republic of China.
National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, No.1 North 2nd Street, Zhongguancun, Haidian District, Beijing, 100190, People's Republic of China.
J Hazard Mater. 2018 Jan 5;341:268-276. doi: 10.1016/j.jhazmat.2017.07.073. Epub 2017 Aug 1.
MgO nanosheets with thickness ranges of 3-10 molecule layers and high specific area (166.44mg) were successfully fabricated by an ultrasound-assisted exfoliation method and used as adsorbent for the removal of both selenite (Se(IV)) and selenate (Se(VI)) from aqueous solutions. The resulting MgO nanosheets displayed high maximum adsorption capacities of 103.52 and 10.28mgg for Se(IV) and Se(VI), respectively. ATR-FTIR and XPS spectroscopic results suggested that both Se(IV) and Se(VI) formed inner-sphere surface complexes on MgO nanosheets under the present experimental conditions. Furthermore, high adsorption capacity for Se(IV/VI) in the presence of coexistent anions (SO, PO, Cl, and F) and efficient regeneratability of adsorbent by NaOH solution were observed in the competitive adsorption and regeneration steps. The simple one-step synthesis process of MgO nanosheets and high adsorption capacities offer a promising method for Se(IV/VI) removal in water treatment.
成功制备了厚度为 3-10 个分子层且比表面积高（166.44mg）的 MgO 纳米片，采用超声辅助剥离法作为吸附剂，用于从水溶液中去除亚硒酸盐（Se(IV)）和硒酸盐（Se(VI)）。得到的 MgO 纳米片对 Se(IV)和 Se(VI)的最大吸附容量分别为 103.52 和 10.28mgg。ATR-FTIR 和 XPS 光谱结果表明，在本实验条件下，Se(IV)和 Se(VI)均在 MgO 纳米片上形成内圈表面配合物。此外，在竞争吸附和再生步骤中，在共存阴离子（SO、PO、Cl 和 F）存在的情况下，MgO 纳米片对 Se(IV/VI)的高吸附容量和吸附剂的高效再生能力得到了观察。MgO 纳米片的简单一步合成工艺和高吸附容量为水处理中去除 Se(IV/VI)提供了一种很有前途的方法。
