Unveiling the impact of nontronite NAu-2 on Akaganeite Bioreduction and Mineral Precipitation

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science Pub Date : 2025-01-02 DOI:10.1016/j.clay.2024.107683

Jean Klopfert , Mustapha Abdelmoula , Christian Mustin , Asfaw Zegeye

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引用次数: 0

Abstract

Fe-oxides and Fe-phyllosilicates coexist in sediments and aquifers, playing a pivotal role in nutrient and pollutant cycles due to their large specific surface area and high reactivity. Under anaerobic conditions, dissimilatory iron-reducing bacteria use Fe(III)-bearing minerals, such as Fe-phyllosilicates and Fe-oxides, as electron acceptors during their metabolic processes. While the bioreduction behavior of individual Fe-oxide and Fe-phyllosilicate minerals is well-documented, much less is known about how their reactivity is altered when combined in a mixed system. This study investigates how low concentrations of Fe-phyllosilicates influence the bioreduction of Fe-oxide by Shewanella oneidensis MR-1, using akaganeite (Aka) and nontronite (NAu-2) as model minerals. The results reveal that the presence of NAu-2 significantly decreased both the rate and extent of Aka bioreduction. Additionally, while bioreduction of Aka led to the formation of magnetite, siderite, and chukanovite, only magnetite precipitated in the presence of NAu-2, as confirmed by XRD, Mössbauer spectroscopy and transmission electron microscopy. These findings suggest that the interaction and surface properties of the Aka-NAu-2 composite fundamentally alter Aka's transformation, highlighting the complexity of mineral reactivity in natural environments.

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...