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Thermal and pH dual-responsive cellulose microfilament spheres for dye removal in single and binary systems
[Display omitted] •Novel dual-responsive cellulose microfilament-based adsorbents (MPNAA) were prepared.•The resulting adsorbent exhibited the temperature and pH sensitivity on contaminant adsorption.•The dye adsorption was carried out in both single and binary systems.•The mechanism of adsorption p...
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Published in: | Journal of hazardous materials 2019-09, Vol.377, p.88-97 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | [Display omitted]
•Novel dual-responsive cellulose microfilament-based adsorbents (MPNAA) were prepared.•The resulting adsorbent exhibited the temperature and pH sensitivity on contaminant adsorption.•The dye adsorption was carried out in both single and binary systems.•The mechanism of adsorption process was revealed based on various kinetics models.•MPNAA is a sustainable and renewable adsorbent for effluent treatment.
Cellulose microfilaments/poly(N-Isopropylacrylamide-co-acrylic acid) spheres (MPNAA) were prepared via the in-situ synthesis of semi-interpenetrating networks (semi-IPN). The free radical copolymerization of acrylic acid (AA) (for pH-sensitive chain segments) and N-isopropylacrylamide (NIPAM) (for temperature-sensitive chain segments) was conducted in a microwave-reactor in the presence of porous cellulose/microfilament composite spherical beads pre-prepared. The surface morphology and adsorption properties of the as-prepared spheres were systematically characterized. The adsorption behaviors of resulting MPNAA towards dyes, methylene blue (MB) and methyl violet (MV), were pH sensitive; and the optimal adsorption occurred at pH 9. The dynamic adsorption processes could be well fitted with pseudo-second-order kinetic, Elovich and simplified intraparticle diffusion models. Meanwhile, Langmuir, Temkin, Freundlich, and Dubinin-Raduskevich models were used to fit the adsorption isotherms at 25, 40, and 55 °C, respectively. The results indicated that the adsorption capacities of MPNAA towards MB and MV could reach as high as 497.5 and 840.3 mg g−1, respectively, in single systems; and high adsorption capacity was maintain in binary systems with the favorable adsorption of MV. Overall, the semi-IPN MPNAA spheres are promising as novel pH- and temperature-responsive adsorbents, facilitating the controllable adsorption/desorption processes. |
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ISSN: | 0304-3894 1873-3336 |
DOI: | 10.1016/j.jhazmat.2019.05.033 |