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

Ara Carballo-Meilan, Elizabeth Hernández-Francisco, Gustavo Sosa-Loyde, José Bonilla-Cruz, Paul Russell, Zulfiqur Ali, Alejandra García-García, Alejandro Arizpe-Zapata, Francisco Longoria-Rodríguez, Tania E. Lara-Ceniceros, Chun Yang Yin

Research output: Contribution to journalArticlepeer-review

Abstract

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.]

Original languageEnglish
Pages (from-to)10259-10276
Number of pages18
JournalCellulose
Volume27
Issue number17
DOIs
Publication statusPublished - 30 Nov 2020

Bibliographical note

Funding Information:
The project is jointly funded by the British Council Institutional Links programme (Newton Fund) (Grant No. 264232317) and Consejo Nacional de Ciencia y Tecnolog?a (CONACYT) through the Institutional Links-FONCICYT Program (Grant No. 276243).

Funding Information:
The project is jointly funded by the British Council Institutional Links programme (Newton Fund) (Grant No. 264232317) and Consejo Nacional de Ciencia y Tecnología (CONACYT) through the Institutional Links-FONCICYT Program (Grant No. 276243).

Publisher Copyright:
© 2020, The Author(s).

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