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20. E. Igberase, P. Osifo, A. Ofomaja, Chromium (VI) ion adsorption by grafted cross-linked
chitosan beads in aqueous solution—a mathematical and statistical modeling study. Environ.
Technol. (United Kingdom) 38(24) (2017)
21. R. Terreux, M. Domard, C. Viton, A. Domard, Interactions study between the copper II ion
and constitutive elements of chitosan structure by DFT calculation. Biomacromolecules 7(1),
31–37 (2006)
22. M.L. Ferreira, M.E. Gschaider, Theoretical and experimental study of Pb 2+ and Hg 2+ adsorption
on biopolymers, 1 theoretical study (2001), pp. 233–248
23. G.S. Simate, S. Ndlovu, The removal of heavy metals in a packed bed column using immobilized
cassava peel waste biomass. J. Ind. Eng. Chem. 21, 635–643 (2015)
24. M. Ahmad, K. Manzoor, S. Ikram, Versatile nature of hetero-chitosan based derivatives as
biodegradable adsorbent for heavy metal ions; a review. Int. J. Biol. Macromol. 105, 190–203
(2017)
25. S. Nagireddi, V. Katiyar, R. Uppaluri, Pd(II) adsorption characteristics of glutaraldehyde crosslinked chitosan copolymer resin. Int. J. Biol. Macromol. 94, 72–84 (2017)
26. P. Kampalanonwat, P. Supaphol, The study of competitive adsorption of heavy metal ions from
aqueous solution by aminated polyacrylonitrile nanofiber mats. Energy Procedia. 56(C) (2014),
pp. 142–151
27. V.N. Tirtom, A. Dinçer, S. Becerik, T. Aydemir, A. Çelik, Comparative adsorption of Ni(II) and
Cd(II) ions on epichlorohydrin crosslinked chitosan-clay composite beads in aqueous solution.
Chem. Eng. J. 197, 379–386 (2012)
28. J. Wang, M. Liu, C. Duan, J. Sun, Y. Xu, Preparation and characterization of cellulose-based
adsorbent and its application in heavy metal ions removal. Carbohydr. Polym. 206 (2019),
pp. 837–843
29. B. Li, M. Li, J. Zhang, Y. Pan, Z. Huang, H. Xiao, Adsorption of Hg (II) ions from aqueous
solution by diethylenetriaminepentaacetic acid-modified cellulose. Int. J. Biol. Macromol. 122,
149–156 (2019)
30. C. Dong, F. Zhang, Z. Pang, G. Yang, Efficient and selective adsorption of multi-metal ions
using sulfonated cellulose as adsorbent. Carbohydr. Polym. 151, 230–236 (2016)
31. M. Doˇ gan, Y. Turhan, M. Alkan, H. Namli, P. Turan, Ö.¨ Demirba¸ s Functionalized sepiolite
for heavy metal ions adsorption. Desalination 230(1–3) (2008), pp. 248–268
32. A.J.K. Kupeta, E.B. Naidoo, A.E. Ofomaja, Kinetics and equilibrium study of 2-nitrophenol
adsorption onto polyurethane cross-linked pine cone biomass. J. Clean. Prod. 179, 191–209
(2018)
33. E. Igberase, A. Ofomaja, P.O. Osifo, Enhanced heavy metal ions adsorption by 4-aminobenzoic
acid grafted on chitosan/epichlorohydrin composite: Kinetics, isotherms, thermodynamics and
desorption studies. Int. J. Biol. Macromol. 123, 664–676 (2019)
34. J. Shen, Z. Duvnjak, Adsorption kinetics of cupric and cadmium ions on corncob particles.
Process Biochem. 40(11), 3446–3454 (2005)
35. Y. Saˇ g, Y. Aktay, Mass transfer and equilibrium studies for the sorption of chromium ions onto
chitin. Process Biochem. 36(1–2), 157–173 (2000)
36. K.H. Chu, Removal of copper from aqueous solution by chitosan in prawn shell: adsorption
equilibrium and kinetics. J. Hazard. Mater. 90(1), 77–95 (2002)
37. R.S. Juang, H.J. Shao, A simplified equilibrium model for sorption of heavy metal ions from
aqueous solutions on chitosan. Water Res. 36(12), 2999–3008 (2002)
38. M. Rhazi, A. Tolaimate, M. Rhazi, J. Desbriéres, A. Tolaimate, M. Rinaudo, A. Alagui, P.
Vottero, Contribution to the study of the complexation of copper by chitosan and oligomers.
Polymer (Guildf) 43(4), 1267–1276 (2001)
39. V.J.P. Vilar, C.M.S. Botelho, R.A.R. Boaventura, Modeling equilibrium and kinetics of metal
uptake by algal biomass in continuous stirred and packed bed adsorbers. Adsorption 13(5–6),
587–601 (2007)
40. E. Igberase, P. Osifo, A. Ofomaja, Mathematical modelling of Pb 2+ , Cu 2+ , Ni 2+ , Zn 2+ , Cr 6+
and Cd 2+ ions adsorption from a synthetic acid mine drainage onto chitosan derivative in a
packed bed column. Environ. Technol. (United Kingdom) (2017)