Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 164, Issue -, Pages 3965-3973Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2020.09.029
Keywords
Chitosan beads; Deep eutectic solvent; Malachite green
Funding
- Universiti Sains Malaysia [304/PKIMIA/6315106, 304/PKIMIA/650996]
- Ministry of Education [203.PKIMIA.6711641]
- Tertiary Education Trust Fund (TETFund) through Bauchi State University, Nigeria
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Chitosan-deep eutectic solvent (DES) beads were prepared from chitosan and DESs. The DESs used were choline chloride-urea (DES A) and choline chloride-glycerol (DES B). Both chitosan-DES beads were used to remove malachite green ( MG) dye from an aqueous solution. The optimum pH for chitosan-DES A was recorded at pH 8.0 while optimum pH for chitosan-DES B was pH 9.0. The maximum adsorption capacity obtained for chitosan-DES A and chitosan-DES B were 6.54 mg/g and 8.64 mg/g, respectively. The optimum conditions for both chitosan-DES beads to remove MG were 0.08 g of adsorbent and 20 min of agitation time. Five kinetic models were applied to analyse the data and the results showed that the pseudo-second-order and intraparticle diffusion model fitted best with R-2 > 0.999. For the adsorption capacity, results show that the Freundlich and Langmuir adsorption isotherms fitted well with chitosan-DES A and chitosan-DES B, respectively. The maximum adsorption capacities (qmax) obtained from chitosan-DES A and chitosan-DES Bwere 1.43 mg/g and 17.86 mg/g, respectively. Desorption indicated good performance in practical applications. (C) 2020 Published by Elsevier B.V.
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