Effect of Oxidation on Vivianite Dissolution Rates and Mechanism
The interest in the mineral vivianite (Fe3(PO4)2·8H2O) as a more sustainable P resource has grown significantly in recent years owing to its efficient recovery from wastewater and its potential use as a P fertilizer. Vivianite is metastable in oxic environments and readily oxidizes. As dissolution and oxidation occur concurrently, the impact of oxidation on the dissolution rate and mechanism is not fully understood. In this study, we disentangled the oxidation and dissolution of vivianite to develop a quantitative and mechanistic understanding of dissolution rates and mechanisms under oxic conditions. Controlled batch and flow-through experiments with pristine and preoxidized vivianite were conducted to systematically investigate the effect of oxidation on vivianite dissolution at various pH-values and temperatures. Using X-ray absorption spectroscopy and scanning transmission X-ray microscopy techniques, we demonstrated that oxidation of vivianite generated a core-shell structure with a passivating oxidized amorphous Fe(III)-PO4 surface layer and a pristine vivianite core, leading to diffusion-controlled oxidation kinetics. Initial (<1 h) dissolution rates and concomitant P and Fe release (∼48 h) decreased strongly with increasing degree of oxidation (0-≤ 100%). Both increasing temperature (5-75 °C) and pH (5-9) accelerated oxidation, and, consequently, slowed down dissolution kinetics.
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Format: | Article/Letter to editor biblioteca |
Language: | English |
Subjects: | amorphous iron phosphate, core-shell structure, metastability, mineral transformation, oxidation kinetics, santabarbaraite, |
Online Access: | https://research.wur.nl/en/publications/effect-of-oxidation-on-vivianite-dissolution-rates-and-mechanism |
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dig-wur-nl-wurpubs-6352492024-10-17 Metz, Rouven Kumar, Naresh Schenkeveld, Walter D.C. Obst, Martin Voegelin, Andreas Mangold, Stefan Kraemer, Stephan M. Article/Letter to editor Environmental Science and Technology 58 (2024) 34 ISSN: 0013-936X Effect of Oxidation on Vivianite Dissolution Rates and Mechanism 2024 The interest in the mineral vivianite (Fe3(PO4)2·8H2O) as a more sustainable P resource has grown significantly in recent years owing to its efficient recovery from wastewater and its potential use as a P fertilizer. Vivianite is metastable in oxic environments and readily oxidizes. As dissolution and oxidation occur concurrently, the impact of oxidation on the dissolution rate and mechanism is not fully understood. In this study, we disentangled the oxidation and dissolution of vivianite to develop a quantitative and mechanistic understanding of dissolution rates and mechanisms under oxic conditions. Controlled batch and flow-through experiments with pristine and preoxidized vivianite were conducted to systematically investigate the effect of oxidation on vivianite dissolution at various pH-values and temperatures. Using X-ray absorption spectroscopy and scanning transmission X-ray microscopy techniques, we demonstrated that oxidation of vivianite generated a core-shell structure with a passivating oxidized amorphous Fe(III)-PO4 surface layer and a pristine vivianite core, leading to diffusion-controlled oxidation kinetics. Initial (<1 h) dissolution rates and concomitant P and Fe release (∼48 h) decreased strongly with increasing degree of oxidation (0-≤ 100%). Both increasing temperature (5-75 °C) and pH (5-9) accelerated oxidation, and, consequently, slowed down dissolution kinetics. en application/pdf https://research.wur.nl/en/publications/effect-of-oxidation-on-vivianite-dissolution-rates-and-mechanism 10.1021/acs.est.4c04809 https://edepot.wur.nl/675194 amorphous iron phosphate core-shell structure metastability mineral transformation oxidation kinetics santabarbaraite https://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/ Wageningen University & Research |
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amorphous iron phosphate core-shell structure metastability mineral transformation oxidation kinetics santabarbaraite amorphous iron phosphate core-shell structure metastability mineral transformation oxidation kinetics santabarbaraite |
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amorphous iron phosphate core-shell structure metastability mineral transformation oxidation kinetics santabarbaraite amorphous iron phosphate core-shell structure metastability mineral transformation oxidation kinetics santabarbaraite Metz, Rouven Kumar, Naresh Schenkeveld, Walter D.C. Obst, Martin Voegelin, Andreas Mangold, Stefan Kraemer, Stephan M. Effect of Oxidation on Vivianite Dissolution Rates and Mechanism |
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The interest in the mineral vivianite (Fe3(PO4)2·8H2O) as a more sustainable P resource has grown significantly in recent years owing to its efficient recovery from wastewater and its potential use as a P fertilizer. Vivianite is metastable in oxic environments and readily oxidizes. As dissolution and oxidation occur concurrently, the impact of oxidation on the dissolution rate and mechanism is not fully understood. In this study, we disentangled the oxidation and dissolution of vivianite to develop a quantitative and mechanistic understanding of dissolution rates and mechanisms under oxic conditions. Controlled batch and flow-through experiments with pristine and preoxidized vivianite were conducted to systematically investigate the effect of oxidation on vivianite dissolution at various pH-values and temperatures. Using X-ray absorption spectroscopy and scanning transmission X-ray microscopy techniques, we demonstrated that oxidation of vivianite generated a core-shell structure with a passivating oxidized amorphous Fe(III)-PO4 surface layer and a pristine vivianite core, leading to diffusion-controlled oxidation kinetics. Initial (<1 h) dissolution rates and concomitant P and Fe release (∼48 h) decreased strongly with increasing degree of oxidation (0-≤ 100%). Both increasing temperature (5-75 °C) and pH (5-9) accelerated oxidation, and, consequently, slowed down dissolution kinetics. |
format |
Article/Letter to editor |
topic_facet |
amorphous iron phosphate core-shell structure metastability mineral transformation oxidation kinetics santabarbaraite |
author |
Metz, Rouven Kumar, Naresh Schenkeveld, Walter D.C. Obst, Martin Voegelin, Andreas Mangold, Stefan Kraemer, Stephan M. |
author_facet |
Metz, Rouven Kumar, Naresh Schenkeveld, Walter D.C. Obst, Martin Voegelin, Andreas Mangold, Stefan Kraemer, Stephan M. |
author_sort |
Metz, Rouven |
title |
Effect of Oxidation on Vivianite Dissolution Rates and Mechanism |
title_short |
Effect of Oxidation on Vivianite Dissolution Rates and Mechanism |
title_full |
Effect of Oxidation on Vivianite Dissolution Rates and Mechanism |
title_fullStr |
Effect of Oxidation on Vivianite Dissolution Rates and Mechanism |
title_full_unstemmed |
Effect of Oxidation on Vivianite Dissolution Rates and Mechanism |
title_sort |
effect of oxidation on vivianite dissolution rates and mechanism |
url |
https://research.wur.nl/en/publications/effect-of-oxidation-on-vivianite-dissolution-rates-and-mechanism |
work_keys_str_mv |
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1813191589774753792 |