Sorption thermodynamic and kinetic study of Cu(II) onto modified plant stem bark
Abstract In this study, four types of “Juá” stem barks ( Ziziphus joazeiro ) were investigated for the removal of Cu(II) from aqueous solutions. The tested samples included natural coarse barks, and barks washed with water, ethanol–water, and NaOH solutions. The solvent-modified materials simulated the waste of the industrial extraction of saponins from bark. The valorization of these processing residues as sorbents was evaluated. The NaOH-washed sorbent exhibited the highest sorption capacity for Cu(II) (maximum sorption capacity $$\approx$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>≈</mml:mo> </mml:math> 32 mg g −1 ). Ion exchange process between copper and exchangeable surface cations and electrostatic attraction of copper with carboxylate and phenolate groups were identified as the primary sorption mechanisms. Desorption tests revealed that a large portion of the metal sorbed (80%) was easily released from the sorbent thus suggesting, in line with the proposed mechanisms, the existence of weak sorbate-sorbent interactions. The sorptive process was found to be exothermic (∆H° = − 48.1 ± 13.5 kJ.mol −1 ) and thermodynamically favorable at lower temperatures. Graphical Abstract
Authors
- Francisco José de Paula Filho (ORCID: https://orcid.org/0000-0002-6253-461X)
- Yannice Tatiane da Costa Santos (ORCID: https://orcid.org/0000-0002-6730-1815)
- Stefano Salvestrini (ORCID: https://orcid.org/0000-0002-9392-9358)
- Antônio Júnior Alves Ribeiro (ORCID: https://orcid.org/0000-0002-6607-6409)
- Jorge Marcell Coelho Menezes (ORCID: https://orcid.org/0000-0001-9162-5142)
- Raimundo Nonato Pereira Teixeira (ORCID: https://orcid.org/0000-0002-2931-5087)
- Henrique Douglas Melo Coutinho (ORCID: https://orcid.org/0000-0002-6634-4207)
- D.M. Sena (ORCID: https://orcid.org/0000-0003-4362-7121)
- João Victor Serra Nunes (ORCID: https://orcid.org/0009-0007-9010-0505)
- Clara Beatryz Gomes Vieira
Institutions
- University of Campania "Luigi Vanvitelli" (IT)
- Universidade Federal do Ceará (BR)
- Universidade Federal do Cariri (BR)
- Universidade Regional do Cariri (BR)
Publication Details
- Journal
- Environmental Science and Pollution Research
- Published
- 2024-10-22
- DOI
- https://doi.org/10.1007/s11356-024-35194-6
- Citations
- 6
- Primary Topic
- Lignin and Wood Chemistry
- Type
- article
- Field-Weighted Citation Impact
- 1.11
Funders
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Ministério da Ciência, Tecnologia e Inovação
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico
- Università degli Studi della Campania Luigi Vanvitelli