Journal
CARBOHYDRATE POLYMERS
Volume 203, Issue -, Pages 246-255Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.09.051
Keywords
pH-responsive; Biomass cellulose; Oil/water separation; Protonation
Categories
Funding
- Guangxi Science and Technology Research Program [14251009, AA17202032]
- Director Fund Project of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control [ZR201701]
- Innovation Project of Graduate Education [YCSW2018042]
- National Natural Science Foundation of China [31860193]
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Two novel pH-responsive reversible-wettability biomass cellulose-based materials of cellulose-g-PAA and cellulose-g-PAM were conveniently prepared by grafting acrylic acid (AA) and acrylamide (AM), respectively, onto eucalyptus pulp cellulose. The hydrophobic-oleophilic of cellulose-g-PAA and the oleophobic-hydrophilic of cellulose-g-PAM were converted to oleophobic-hydrophilic and hydrophobic-oleophilic, respectively, as the pH converted from 1 to 9. The pH-responsive mechanism of these cellulose-based materials was investigated by C-13 nuclear magnetic resonance, X-ray photoelectron spectroscopy, and atomic force microscopy analyses. The resulting cellulose-g-PAA and cellulose-g-PAM papers were applied in the switchable separation of oil/water mixtures. Water passed through the cellulose-g-PAA paper at pH= 9 and cellulose-g-PAM paper at pH= 1, while oil was retained. After changing the pH value, oil permeated these papers, but water did not. The papers exhibited excellent regeneration performances; the oil adsorbed on the papers was completely desorbed via pH control.
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