Highly efficient and ultrafast removal of Cr(VI) in aqueous solution to ppb level by poly(allylamine hydrochloride) covalently cross-linked amino-modified graphene oxide
Highly efficient and ultrafast removal of Cr(VI) in aqueous solution to ppb level by poly(allylamine hydrochloride) covalently cross-linked amino-modified graphene oxide
复制标题
聚（盐酸烯丙胺）共价交联氨基修饰氧化石墨烯高效、超快速地将水溶液中的 Cr(VI) 去除至 ppb 级
DOI：
10.1016/j.jhazmat.2020.124470
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发表时间：
2021-02-23
影响因子：
13.6
通讯作者：
Sun, Yinyong
中科院分区：
文献类型：
--
作者：
Bao, Shuangyou;Yang, Weiwei;Sun, Yinyong
本文报道了一种通过席夫碱反应制备聚烯丙胺盐酸盐氨基修饰氧化石墨烯(PAH-ASGO)的简便方法。所得PAH-ASGO对六价铬的最大吸附容量为373.1 mg/g，是纯氧化石墨烯的近9倍，超过了以往报道的大多数氧化石墨基材料。更重要的是，PAH-ASGO能有效地将饮用水中的铬(VI)浓度从9.9 mg/L降至10 S以内的极低水平0.004 mg/L，远低于饮用水中铬(VI)的最高允许水平(0.05 mg/L)。此外，经过10次循环后，该吸附剂仍表现出91.8%的优良去除效率。考虑到PAH-ASGO的多样性，我们还开发了一种磁性PAH-ASGO/Fe3O4吸附剂，通过简单的交联反应实现了PAH-ASGO从其水溶液中的快速分离。最后，成功地将PAH-ASGO用于实际工业废水的处理。
We herein report a facile strategy to prepare poly(allylamine hydrochloride) cross-linked amino-modified graphene oxide (PAH-ASGO) by Schiff-base reactions. The resulting PAH-ASGO exhibited a maximum adsorption capacity of 373.1 mg/g for Cr(VI), which was nearly 9 times higher than that of pure graphene oxide, exceeding that of most GO-based materials previously reported. More significantly, PAH-ASGO can effectively diminish the Cr(VI) concentration from 9.9 mg/L to the extremely low level of 0.004 mg/L within 10 s, far below the maximum allowable level of Cr(VI) (0.05 mg/L) in drinking water. In addition, the adsorbents still displayed excellent removal efficiency of 91.8% after 10 cycles. Considering the broad diversity, we developed also a magnetic PAH-ASGO/Fe3O4 adsorbent by a simple cross-linking reaction to achieve rapid separation of PAH-ASGO from their aqueous solution. Finally, the PAH-ASGO was successfully utilized to treat the actual industrial effluent.