Characterization of Coprecipitates of As(III) and Fe(II) in the Presence of Phyllosilicate Nanoparticles
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Characterization of Coprecipitates of As(III) and Fe(II) in the Presence of Phyllosilicate Nanoparticles Hao‑Jie Cui1 · Hongzheng Wang1 · Cong Wu1 · Xiaoqing Wei1 · Wenjuan Liao1 · Weijun Zhou1 Received: 12 May 2020 / Accepted: 13 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Phyllosilicate nanoparticles play an important role in regulating the biogeochemical processes of Fe(II) and As(III) in paddy soils due to their high mobility and activity. In the present work, two prepared muscovite nanoparticles with different sizes (LNPs and SNPs) were used to investigate the effect of the size of phyllosilicate nanoparticles on the coprecipitation of Fe(II) and As(III) during oxidation process. The results showed that muscovite nanoparticles could significantly promote the removal of Fe(II) and As(III) during coprecipitation process. The formation of crystalline iron oxide and oxidation of As(III) tended to be suppressed by the two muscovite nanoparticles, and the suppression increased as muscovite nanoparticle size decrease. The findings of this study provide a contribution to understanding the roles of the natural phyllosilicate nanoparticles in regulating the biogeochemical processes of Fe and As elements in polluted paddy soils. Keywords Phyllosilicate · nanoparticle · Fe(II) · Arsenite · Coprecipitation Arsenic (As), as one of the toxic elements in the polluted paddy soils, has attracted much attention because it poses a serious threat to human health by entering into food chains (Kumarathilaka et al. 2019; Li et al. 2011). Arsenic availability to rice is greatly influenced by its mobility and inorganic chemical species (As(V) and As(III)), which mainly depend on the biogeochemical redox processes in the polluted paddy soils (Han et al. 2019; Tong et al. 2019). Particularly, iron (Fe) redox cycling plays an important role in controlling the mobility and species of As during alternating wetting and drying cycles (Xu et al. 2017; Yu et al. 2016). Under reduced flooding conditions, Fe(II) is one of the main Fe species in paddy soils, and these dissolved Fe(II) can precipitate in As immobilization via coprecipitation route coupled with As(III) oxidation and adsorption on the surface of iron oxides (Han et al. 2016; Wang and Giammar 2015).
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00128-020-02973-z) contains supplementary material, which is available to authorized users. * Hao‑Jie Cui [email protected] 1
College of Resources and Environment, Hunan Agricultural University, Changsha 410128, People’s Republic of China
Phyllosilicate minerals are ubiquitous in soils, and these minerals could regulate geochemical process of dissolved Fe(II) through adsorption, atom exchange, and electron transfer (Latta et al. 2017; Neumann et al. 2015; Starcher et al. 2016). The formation of crystalline Fe oxides from Fe(II)/Fe(III) ions could be significantly inhibited in the presence of phyllosilicate minerals (Wei et al. 2011), and
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