Abstract
This paper reports on the use of cellulose nanofibrils (CNFs) and (3-mercaptopropyl) trimethoxysilane (MPTMS) to prepare compressible aerogels. The aerogels were functionalized with diallydimethylammonium chloride (DADMAC) and N,N’-methylenebis(acrylamide) (MBAA) via the thiol-ene click reaction to remove anionic dye methyl orange (MO) from wastewater. The controlled hydrolysis and condensation of MPTMS on CNF produced a hydrogel that was freeze dried to form a compressible aerogel. The aerogel was modified by polymerizing DADMAC on the surface to impart functional groups for dye binding, and this was further enhanced through the addition of MBAA at varying initial ratios to enhance DADMAC incorporation. The aerogel displayed a maximum adsorption capacity 186.7 mg/g determined from the Langmuir model for MO dye. Kinetic experiments revealed that the mass transfer rate of MO dye into the aerogel was described by the pore diffusion model, having a pore diffusion coefficient of 1.8 × 10–9 m2/s. The effect of environmental conditions, such as solution pH, ionic strength and temperature demonstrated that the adsorption was influenced by electrostatic interactions between the MO and adsorbent surface, followed by physisorption. After regeneration of the aerogel using 2 M NaCl, the adsorbent retained 77% of its initial adsorption capacity.
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Acknowledgements
Authors wish to acknowledge the research group of Prof. Boxin Zhao for providing assistance with compression testing experiments, as well as the research group of Prof. Michael Pope for providing assistance with SEM images. The research funding from CelluForce and AboraNano facilitated the research on CNCs. K. C. Tam wishes to acknowledge funding from CFI and NSERC. Nathan Grishkewich gratefully acknowledges support of the NSERC Canada Graduate Doctoral Scholarship.
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Grishkewich, N., Li, Y., Liu, K. et al. Synthesis and characterization of modified cellulose nanofibril organosilica aerogels for the removal of anionic dye. J Polym Res 29, 261 (2022). https://doi.org/10.1007/s10965-022-03102-6
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DOI: https://doi.org/10.1007/s10965-022-03102-6