A novel cellulose hydrogel coating with nanoscale Fe 0 for Cr(VI) adsorption and reduction.
SCIENCE OF THE TOTAL ENVIRONMENT(2020)
摘要
A novel cellulose hydrogel coating nanoscale Fe-0 (CH@nFe(0)) was synthesized and utilized to improve the dispersibility and oxidation resistance of nFe(0). The composition and structure of CH@nFe(0) were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) before and after its reaction with Cr(VI). The performance of CH@nFe(0) in the removal of Cr(VI) was evaluated through a comparative experiment between nFe(0) and CH. The influence of the initial concentration of Cr(VI), temperature, dosage, and the initial pH of the solution were also evaluated in this reaction system. The results showed that CH@nFe(0) allowed a higher Cr(VI) removal rate compared to nFe(0) and CH. This might have derived from an enhanced reduction and adsorption of Cr(VI) by CH. Meanwhile, the network structure of the cellulose hydrogel served as amass-transfer channel between Cr(VI) and nFe(0). In addition, the increase of the initial solution pH minimized the removal of Cr(VI). This mechanism revealed that CH coating resulted in an enhancement of the adsorption capability and reducibility of CH@nFe(0) with respect to Cr (VI). The CH@nFe(0) composite is characterized by an advantageous mesoporous network structure and functional groups of amide and carboxylic acid, which provide additional active sites and promote mass transfer. This new three-dimensional (3-D) cellulose hydrogel coating containing nFe(0) can be effectively used for the removal of Cr (VI) ions from aquatic environments. (C) 2020 Elsevier B.V. All rights reserved.
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关键词
Nanoscale nFe(0),Cellulose hydrogel,Adsorption and reduction,Cr(VI)
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