Adsorption of phosphate in aqueous solution by ash from the fruit peel of Caryocar coriaceum Wittm: adsorption characteristics and behavior

Francisco José de Paula Filho; Yago Neco Teixeira; Vinícius Pereira Bacurau; Anderson Zhong Fan; Jorge Marcell Coelho Menezes; Thiago Mielle Brito Ferreira Oliveira; Raimundo Nonato Pereira Teixeira; Henrique Douglas Melo Coutinho; Ronaldo Ferreira do Nascimento

doi:10.1007/s11356-023-28292-4

Adsorption of phosphate in aqueous solution by ash from the fruit peel of Caryocar coriaceum Wittm: adsorption characteristics and behavior

Environ Sci Pollut Res Int. 2023 Jul 4. doi: 10.1007/s11356-023-28292-4. Online ahead of print.

Affiliations

¹ Agrarian Sciences and Biodiversity Center, Federal University of Cariri, R. Ícaro Moreira de Sousa, 126, Crato, CE, 63130-025, Brazil. francisco.filho@ufca.edu.br.
² Science and Technology Center, Federal University of Cariri, Av. Ten. Raimundo Rocha, 1639, Juazeiro Do Norte, CE, 63048-080, Brazil. francisco.filho@ufca.edu.br.
³ Agrarian Sciences and Biodiversity Center, Federal University of Cariri, R. Ícaro Moreira de Sousa, 126, Crato, CE, 63130-025, Brazil.
⁴ Science and Technology Center, Federal University of Cariri, Av. Ten. Raimundo Rocha, 1639, Juazeiro Do Norte, CE, 63048-080, Brazil.
⁵ Biological Chemistry Department, Regional University of Cariri, R. Cel. Antonio Luis, 1161, Crato, CE, 63105-000, Brazil.
⁶ Materials Engineering Department, Federal University of São Carlos, Rod. Washington Luiz, 235, São Carlos, SP, 13565-905, Brazil.
⁷ Analytical and Physical Chemistry Department, Federal University of Ceará, Fortaleza, CE, 60356-000, Brazil.

PMID: 37402045
DOI: 10.1007/s11356-023-28292-4

Abstract

High phosphate concentrations in natural waters are associated with eutrophication problems that negatively affect the fauna and flora of ecosystems. As an alternative solution to this problem, we evaluated the adsorptive capacity of the fruit peel ash (PPA) of Caryocar coriaceum Wittm and its efficiency in removing phosphate (PO₄^3-) from aqueous solutions. PPA was produced under an oxidative atmosphere and calcinated at 500 °C. The XRF and EDS analyses of PPA after contact with an aqueous PO₄^3- solution showed an increase in its PO₄^3- content, thus confirming the adsorption of PO₄^3-. The Elovich and Langmuir models are the ones fitting the kinetics and the equilibrium state of the process, respectively. The highest PO₄^3- adsorption capacity was approximately 79.50 mg g^-1 at 10 °C. PO₄^3- adsorption by PPA is a spontaneous, favorable, and endothermic process involving structural changes. The highest removal efficiency was 97.08% using a 100 mg.L^-1 PO₄^3- solution. In sight of this, PPA has shown potential as an excellent natural bioadsorbent.

Keywords: Adsorption; Ashes; Bioadsorbents; Isotherms; Kinetics; Phosphate.

Adsorption of phosphate in aqueous solution by ash from the fruit peel of Caryocar coriaceum Wittm: adsorption characteristics and behavior

Authors

Affiliations

Abstract

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