Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou, 730000, China.
Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Petroleum Resources, Gansu Province, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China.
Environ Pollut. 2019 Aug;251:945-951. doi: 10.1016/j.envpol.2019.05.051. Epub 2019 May 16.
The removals of arsenic and selenium pollutants are always urgent desires for the water security. In this study, both sorption and catalysis strategies were combined for the effective removals of As(V) and Se(VI) over magnetic graphene oxide sheets (GOs)-oxidized carbon nanotubes (OCNTs) hydrogels. The sorption behavior facilitated the operation of catalysis reactions, meanwhile, the catalytic reduction promoted the release of occupied sorption sites and then restarted a new sorption-catalysis cycle. The synergic effect of sorption and catalysis realized 258.2 mg g for As(V) enrichment capacity on MPG2T1, and ultra-fast sorption and catalysis equilibriums were identified within 9 min. In the case of Se(VI), a moderate enrichment performance was observed to be 46.2 mg g. Similarly, the ultra-fast sorption and reduction of Se(VI) were realized within 2 min. In the competition experiments, only SO, SO, and HPO showed interference for As(V) and Se(VI) removals. These results testified the superiority of the synergy effect of sorption and catalysis, and the feasibility of 3D magnetic GOs-OCNTs hydrogel in practical implementations.
去除砷和硒污染物一直是保障水安全的迫切需求。在本研究中，吸附和催化策略被结合用于磁性氧化石墨烯片（GOs）-氧化碳纳米管（OCNTs）水凝胶上有效去除 As(V)和 Se(VI)。吸附行为促进了催化反应的进行，同时，催化还原促进了占据吸附位的释放，然后重新启动了新的吸附-催化循环。吸附和催化的协同作用实现了 MPG2T1 对 As(V)的 258.2 mg g 的富集容量，并且在 9 min 内鉴定出超快速吸附和催化平衡。对于 Se(VI)，观察到适中的富集性能为 46.2 mg g。同样，Se(VI)的超快速吸附和还原在 2 分钟内实现。在竞争实验中，只有 SO、SO 和 HPO 对 As(V)和 Se(VI)的去除表现出干扰。这些结果证明了吸附和催化协同作用的优越性，以及 3D 磁性 GOs-OCNTs 水凝胶在实际应用中的可行性。
