Unveiling the mechanistic aspects of methylene blue adsorption onto a novel phosphate-decorated coconut fiber lignin.

Autor: Araújo RF; Department of Research, Extension and Production, Federal Institute of Education, Science and Technology of Ceará, 63503-790 Iguatu, CE, Brazil., Bezerra LCA; Department of Research, Extension and Production, Federal Institute of Education, Science and Technology of Ceará, 63503-790 Iguatu, CE, Brazil., de Novais LMR; NMR Lab, Department of Chemistry, Federal University of Paraná, 81530-900 Curitiba, PR, Brazil., D'Oca CDRM; NMR Lab, Department of Chemistry, Federal University of Paraná, 81530-900 Curitiba, PR, Brazil., Avelino F; Department of Research, Extension and Production, Federal Institute of Education, Science and Technology of Ceará, 63503-790 Iguatu, CE, Brazil. Electronic address: francisco.avelino@ifce.edu.br.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2023 Dec 31; Vol. 253 (Pt 4), pp. 127011. Date of Electronic Publication: 2023 Sep 23.
DOI: 10.1016/j.ijbiomac.2023.127011
Abstrakt: The aim of this work was to evaluate the adsorptive performance of the phosphorylated coconut fiber lignin (PCFL) obtained through an innovative biorefinery process for removing methylene blue (MB). PCFL was obtained using coconut fiber mixed with 85 % wt. H3PO4 at 70 °C for 1 h. Milled wood lignin (MWL) and PCFL were characterized by FTIR, CP-MAS 31 P NMR, phosphorous and hydroxyl contents, pH PZC , and BET analyses. The batch adsorption tests evaluated the effects of the biosorbent (0.25 - 4 g L -1 ) and adsorbate dosages (2.5 - 7.5 mg L -1 ), contact time (0 - 60 min), pH (4 - 8), ionic strength (0.001 - 0.1 mol L -1 ) and temperature (298.15 - 318.15 K) on MB adsorption. Kinetic, equilibrium, and thermodynamic modeling were used. The phosphorous content on PCFL was 2.5 times higher than that of MWL. PCFL presented an enhanced adsorptive performance for removing MB, which was spontaneous (ΔG 0  < 0), endothermic (ΔH 0  > 0), with affinity between the biosorbent and adsorbate (ΔS 0  > 0), and driven by physisorption (E a  > 40 kJ mol -1 ). The adsorptive performance of PCFL was enhanced due to the grafting of new active sites by using an innovative biorefinery process, showing its potential to be used for textile effluent remediation.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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