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Calcium ferrites for phosphate adsorption and recovery from wastewater†

Matheus Henrique Pimentel Araújo, ORCID logo *a   José Domingos Ardisson, ORCID logo b   Alisson Carlos Krohling, ORCID logo b   Rochel Montero Lago, ORCID logo c   Walber Guimarães Júnior ORCID logo d  and  Juliana Cristina Tristão ORCID logo a  

* Corresponding authors

a Universidade Federal de Viçosa – Campus Florestal – UFV, Rodovia LMG 818, km 06, s/n, Campus Universitário, Florestal, MG, Brazil
E-mail: matheus.pimentel@ufv.br

b Centro de Desenvolvimento da Tecnologia Nuclear – CDTN/CNEN, campus da Universidade Federal de Minas Gerais, Avenida Presidente Antônio Carlos, No 6627, Rua Mário Werneck, S/N – Pampulha, Belo Horizonte, MG, Brazil

c Universidade Federal de Minas Gerais – UFMG, Avenida Presidente Antônio Carlos, No 6627, Rua Mário Werneck, 2 – Pampulha, Belo Horizonte, MG, Brazil

d Universidade Federal de São Carlos – UFSCar, Rodovia Washington Luís, s/n – Monjolinho, São Carlos – SP, Brazil

Abstract

In this study, calcium ferrites with different Ca : Fe atomic ratios (1 : 1, 1 : 2, 1 : 3 and 2 : 1) were prepared from Ca and Fe nitrates treated at 300, 700 and 900 °C and evaluated for phosphate adsorption and recovery from wastewater. TG, XRD, Mössbauer spectroscopy, SEM, VSM magnetic measurements, and BET analyses showed the formation of two different calcium ferrite phases, i.e., CaFe2O4 and Ca2Fe2O5 at 700 and 900 °C. The adsorption results indicated that the formation of calcium ferrite structure is critical for phosphate adsorption/recovery. Evaluation of the pH, initial phosphate concentration, contact time, coexisting ions and desorption conditions showed remarkable adsorption capacities of 62–75 mg g−1 for CaFe1:2-700 and 28–43 mg g−1 for CaFe1:2-900. The phosphate adsorption on the Ca ferrite surfaces is so strong that the recovery/desorption showed limited efficiencies, e.g., 15–39%.

Graphical abstract: Calcium ferrites for phosphate adsorption and recovery from wastewater

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Article information

DOI
https://doi.org/10.1039/D3RA05871A
Article type
Paper
Submitted
28 Aug 2023
Accepted
19 Dec 2023
First published
04 Jan 2024
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2024,14, 1612-1624

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Calcium ferrites for phosphate adsorption and recovery from wastewater

M. H. P. Araújo, J. D. Ardisson, A. C. Krohling, R. M. Lago, W. Guimarães Júnior and J. C. Tristão, RSC Adv., 2024, 14, 1612 DOI: 10.1039/D3RA05871A

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