Ultra-fast enrichment and reduction of As(V)/Se(VI) on three dimensional graphene oxide sheets-oxidized carbon nanotubes hydrogels
Ultra-fast enrichment and reduction of As(V)/Se(VI) on three dimensional graphene oxide sheets-oxidized carbon nanotubes hydrogels
复制标题
三维氧化石墨烯-氧化碳纳米管水凝胶上超快速富集和还原As(V)/Se(VI)
DOI：
10.1016/j.envpol.2019.05.051
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发表时间：
2019-08-01
影响因子：
8.9
通讯作者：
Fan, Qiaohui
中科院分区：
文献类型：
--
作者：
Liang, Jiangjun;Ding, Zhe;Fan, Qiaohui
砷、硒等污染物的去除一直是水安全的迫切需要。在这项研究中，吸附和催化策略相结合，在磁性氧化石墨烯片（GOs）氧化碳纳米管（OCNT5）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，催化还原促进了已占据的吸附位点的释放，从而重新开始一个新的吸附-催化循环。吸附和催化的协同作用使MPG2T1的As(V)富集能力达到258.2 mg g(-1)，并在9 min内确定了超快速吸附和催化平衡。在Se（VI）的情况下，观察到中等富集性能为46.2 mg g（-1）。同样，硒（VI）的超快速吸附和还原在2 min内实现。在竞争实验中，只有SO42-、SO32-和HPO42-对As(V)和Se（VI）的去除有干扰。这些结果证明了吸附和催化协同效应的优越性，以及三维磁性氧化石墨烯-碳纳米管水凝胶在实际应用中的可行性。(C) 2019 Elsevier Ltd.版权所有。
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 (OCNT5) 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(-1) 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(-1). Similarly, the ultra-fast sorption and reduction of Se(VI) were realized within 2 min. In the competition experiments, only SO42-, SO32-, and HPO42- 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. (C) 2019 Elsevier Ltd. All rights reserved.