Study on Precipitation Processes and Phase Transformation Kinetics of Iron Phosphate Dihydrate

Huiqi Wang; Mingxia Guo; Yue Niu; Jiayu Dai; Qiuxiang Yin; Ling Zhou

doi:10.3390/cryst12101369

Crystals (Sep 2022)

Study on Precipitation Processes and Phase Transformation Kinetics of Iron Phosphate Dihydrate

Huiqi Wang,
Mingxia Guo,
Yue Niu,
Jiayu Dai,
Qiuxiang Yin,
Ling Zhou

Affiliations

Huiqi Wang: State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Mingxia Guo: Department of Chemical Engineering, South Kensington Campus, Imperial College London, London SW7 2AZ, UK
Yue Niu: State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Jiayu Dai: State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Qiuxiang Yin: State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Ling Zhou: State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

DOI: https://doi.org/10.3390/cryst12101369
Journal volume & issue: Vol. 12, no. 10
p. 1369

Abstract

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The process of the phase transformation from amorphous to crystalline FePO4·2H2O was studied in this research. It was found that Fe and P are predominantly present as FeHPO4+ and FeH2PO42+ and an induction period exists during the transition from amorphous to monoclinic form. The induction period and the time required for phase transformation were shortened with the increased temperature. Phase transformation could be kinetically described by the Johnson–Mehl–Avrami (JMA) dynamics model. The dissolution rate of amorphous FePO4·2H2O is the rate-limiting step of this process. the activation energy of phase transformation is calculated to be 9.619 kJ/mol. The results in this study provided more guidelines for the regulation of FePO4·2H2O precursors by precipitation method.

Published in Crystals

ISSN: 2073-4352 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Crystallography
Website: http://www.mdpi.com/journal/crystals/

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