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Lookup NU author(s): Dr Chun Yang Yin
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2020, The Author(s). Abstract: In this contribution, we present findings on biosorption of Cu (II) ions using novel alkali-treated nopal fibres. The biosorption data at equilibrium were fitted to several isotherm models and the biosorbent was characterized by XRD and SEM–EDX. The biosorption mechanism was investigated using a holistic approach of pH shifts, apparent colour variations and changes in the concentration of Cu(II) and dissolved hard ions (calcium and magnesium) in the Cu(II) solution. The correlation between the colour, XRD analysis, pH shifts and hard cations released from the biosorbent into the solution suggested the existence of two crystal formations, malachite and moolooite, in what appears to be a microprecipitation mechanism via reactive crystallization. The role of magnesium during the transformation of malachite into moolooite during the copper binding mechanism is analysed. Magnesium cations were released into the solution during malachite growth but were taken up from the solution during the moolooite crystal growth phase. The shift of the molar ratio Mg/Ca was located between the two inflexion points of the crystal growth transition. This specific location at the sorption isotherm was correlated with the colour evolution by a linear discriminant model confirming its association with the polymorphs. Graphic abstract: [Figure not available: see fulltext.]
Author(s): Carballo-Meilan A, Hernandez-Francisco E, Sosa-Loyde G, Bonilla-Cruz J, Russell P, Ali Z, Garcia-Garcia A, Arizpe-Zapata A, Longoria-Rodriguez F, Lara-Ceniceros TE, Yin C-Y
Publication type: Article
Publication status: Published
Journal: Cellulose
Year: 2020
Volume: 27
Pages: 10259-10276
Print publication date: 01/11/2020
Online publication date: 12/10/2020
Acceptance date: 10/09/2020
Date deposited: 03/12/2020
ISSN (print): 0969-0239
ISSN (electronic): 1572-882X
Publisher: Springer Science and Business Media B.V.
URL: https://doi.org/10.1007/s10570-020-03449-3
DOI: 10.1007/s10570-020-03449-3
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