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Biosorption of copper using nopal fibres: moolooite formation and magnesium role in the reactive crystallization mechanism

Lookup NU author(s): Professor Chun Yang Yin

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 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.]


Publication metadata

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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Funder referenceFunder name
264232317
276243

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