Understanding the process of phosphate removal in Fe0/H2O systems using the methylene blue method

Konadu-Amoah, Bernard; Hu, Rui; Cui, Xuesong; Tao, Ran; Ndé-Tchoupé, Arnaud Igor; Gwenzi, Willis; Noubactep, Chicgoua

doi:10.1016/j.cej.2023.143042

Chemical Engineering Journal

2023

DOI: 10.1016/j.cej.2023.143042

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Understanding the process of phosphate removal in Fe0/H2O systems using the methylene blue method

Bernard Konadu-Amoah

Rui Hu

Xuesong Cui

et al.

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Cited by 5 publications

References 73 publications

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Materials for sustainable metallic iron-based water filters: a review

Xiao,

Hu,

Gwenzi

et al. 2024

Environ Chem Lett

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Water pollution is calling for a sustainable remediation method such as the use of metallic iron (Fe0) to reduce and filter some pollutants, yet the reactivity and hydraulic conductivity of iron filters decline over time under field conditions. Here we review iron filters with focus on metallic corrosion in porous media, flaws in designing iron filters, next-generation filters and perspectives such as safe drinking water supply, iron for anaemia control and coping with a reactive material. We argue that assumptions sustaining the design of current Fe0 filters are not valid because proposed solutions address the issues of declining iron reactivity and hydraulic conductivity separately. Alternatively, a recent approach suggest that each individual Fe0 atom corroding within a filter contributes to both reactivity and permeability loss. This approach applies well to alternative iron materials such as bimetallics, composites, hybrid aggregates, e.g. Fe0/sand, and nano-Fe0. Characterizing the intrinsic reactivity of individual Fe0 materials is a prerequisite to designing sustainable filters. Indeed, Fe0 ratio, Fe0 type, Fe0 shape, initial porosity, e.g. pore size and pore size distribution, and nature and size of admixing aggregates, e.g. pumice, pyrite and sand, are interrelated parameters which all influence the generation and accumulation of iron corrosion products. Fe0 should be characterized in long-term experiments, e.g. 12 months or longer, for Fe dissolution, H2 generation and removal of contaminants in three media, i.e., tap water, spring water and saline water, to allow reactivity comparison and designing field-scale filters.

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Materials for sustainable metallic iron-based water filters: a review

Xiao,

Hu,

Gwenzi

et al. 2024

Environ Chem Lett

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Effects of common dissolved anions on the efficiency of Fe0-based remediation systems

Tao,

Hu,

Gwenzi

et al. 2024

Journal of Environmental Management

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Immobilization of phosphorus in sediment-water system by hydrous iron oxide and hydrous iron oxide/calcite mixture under feed input condition

Li,

Zhan,

Lin

2024

Journal of Environmental Sciences

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Understanding the process of phosphate removal in Fe0/H2O systems using the methylene blue method

Cited by 5 publications

References 73 publications

Materials for sustainable metallic iron-based water filters: a review

Materials for sustainable metallic iron-based water filters: a review

Effects of common dissolved anions on the efficiency of Fe0-based remediation systems

Immobilization of phosphorus in sediment-water system by hydrous iron oxide and hydrous iron oxide/calcite mixture under feed input condition

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