Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 625, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.126963
Keywords
Composite adsorbent; Porous materials; Cellulose; Hexavalent chromium; Adsorption
Categories
Funding
- Science & Technology Program of Sichuan Province [2016GZ0222, 2021YFS0284]
- Opening Project of Key Laboratory of Theoretical Chemistry of Environment (South China Normal University) [20200103]
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The cellulose-based composite adsorbent PEI-PAM-CF, featuring a double-network structure and blue fluorescence, demonstrated synergistic effects in removing low concentrations of Cr(VI) and exhibited good regeneration performance. The electrostatic adsorption mechanism between Cr(VI) and PEI-PAM-CF was revealed through reversible fluorescence phenomenon and DFT calculation, showing potential for treating Cr(VI)-containing wastewater at low concentrations.
A cellulose-based composite adsorbent (PEI-PAM-CF) was fabricated via a facile cross-linking of polyethyleneimine/polyacrylamide (PEI/PAM) and cellulose using epichlorohydrin as the cross-linker. It possessed a double-network structure and emitted blue fluorescence. Compared with the control samples (PEI-CF and PAMCF), the PEI-PAM-CF showed a synergy effect for the Cr(VI) removal. It can effectively remove Cr(VI) at low concentration with no structure destroyed for the adsorbent. Other coexisting anions (NO3- , Cl-, H2PO4- and CH3COO-) and cations (Na+, K+, Mg2+, Ca2+ and Cr3+) had no significant effect on Cr(VI) removal except SO42-. After five adsorption/desorption cycles, the Cr(VI) removal only decreased with a loss of 7%, suggesting that the PEI-PAM-CF had good regeneration performance. Most importantly, the electrostatic adsorption mechanism between Cr(VI) and the PEI-PAM-CF was revealed by a reversible fluorescence on-off-on phenomenon and the DFT calculation. The adsorption sites on the PEI-PAM-CF were attributed to the amino groups of the PEI and PAM. Hence, the PEI-PAM-CF was potential for the treatment of Cr(VI)-containing wastewater at low concentration.
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