Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 409, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124470
Keywords
GO; PAH; Adsorption; Reduction; Hexavalent chromium (Cr(VI))
Categories
Funding
- National Natural Science Foundation of China [51871078]
- Heilongjiang Science Foundation [E2018028]
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The newly developed PAH-ASGO adsorbent has high adsorption capacity and rapid removal of Cr(VI), with good reusability. Additionally, the derived magnetic PAH-ASGO/Fe3O4 adsorbent achieves rapid separation of PAH-ASGO.
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.
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