Schwertmannite: occurrence, properties, synthesis and application in environmental remediation

Zhang, Zhuo; Bi, Xue; Li, Xintong; Zhao, Qiancheng; Chen, Honghan

doi:10.1039/c8ra06025h

Cited by 62 publications

(23 citation statements)

References 100 publications

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“…43 The presence of schwertmannite may also be caused by the ammonia leaching out of the catalyst 30 into the impregnating solution leading to the iron(III) sulphate precipitating into schwertmannite. 42 In regards to the removal of iron from Fe-T2 with EDTA in Section 3.3, as schwertmannite is more soluble compared to goethite due to its poor crystallinity, it is more likely to be dissolved by EDTA treatment.…”

Section: Discussionmentioning

confidence: 99%

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Regeneration of a deactivated surface functionalised polyacrylonitrile supported Fenton catalyst for use in wastewater treatment

et al. 2020

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Section: Discussionmentioning

confidence: 99%

“…for Res-(Fe-T2). 42 Other than schwertmannite, there is a major presence of goethite. The presence of the SO 4 2À peak in the spectra is due to the residual Fe 2 (SO 4 ) 3 and Na 2 SO 4 from impregnation from which some schwertmannite has been produced.…”

Section: àmentioning

confidence: 99%

Regeneration of a deactivated surface functionalised polyacrylonitrile supported Fenton catalyst for use in wastewater treatment

et al. 2020

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“…EDS data for the final schwertmannites are exhibited in Table 1 (SO 4 ) x , 1 x 1.86) with a Fe/S mole ratio ranging in 4.3-8.0. [1][2][3][4] Also, EDS data showed that within a shorter cellular cultivation period of 36 h, the absence of Cl À was examined in all schwertmannite products.…”

Section: Morphological Evolution Of Schwertmannitesmentioning

confidence: 99%

“…[1][2][3] The key issues for schwertmannites, such as synthetic strategies, structure-property relationships, potential environmental applications, and related mechanisms, have been recently overviewed. 4 It has been accepted that schwertmannites are effective scavengers [5][6][7][8] and environmentally potential adsorbent materials of metals/ metalloids, [9][10][11][12][13] rare earth elements, 14 and fluoride. 15 However, schwertmannites as an unstable phase will progressively transform into other stable iron mineral phases of jarosite and goethite, releasing an appreciable amount of acidities and bound trace metals, due to variation of pH and acid concentration, 2,3 and the presence of aqueous Fe(II) and dissolved organic matter.…”

Section: Introductionmentioning

confidence: 99%

“…22,23 Obviously, environmental function and phase stability of schwertmannites are closely related to their crystal phases and specific structures, especially nanoscale particle structures. [1][2][3][4] As we have known, nanoparticles, typically defined as solids less than 100 nm, can display various properties. 24 Meanwhile, studies of iron (oxyhydr)oxide nanoparticles, including schwertmannite, akaganétite, goethite, maghemite, magnetite, and hematite, have attracted enormous attention, due to their interesting properties and associated potential applications.…”

Section: Introductionmentioning

confidence: 99%

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Anionic effect on nanostructure and morphology of bio-schwertmannite dynamically produced within cellular reproduction

Xiong

Wang

2020

Nanomaterials and Nanotechnology

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Schwertmannite has been considered as the host mineral and potentially excellent adsorbent of contaminates from waters, and it has various morphologies of spheroid with pincushions, whiskers, hedge-hogs, and needles. In this work, using the (high-resolution transmission and field-emission scanning) electron microscopes, we studied nanostructure, morphological evolution, and difference in chemical composition for the produced schwertmannites in the cell-rich iron solutions. All analysis results showed within cellular 36-h reproduction period, the production of only schwertmannite was examined in iron solutions at the Cl−/SO4 2− molar ratios of 0–10 and pH 3.0 ± 0.1. There were differences in two typical morphologies of “pincushions” (Cl−/SO4 2− = 0 and 3) and “hedge-hogs” (Cl−/SO4 2− = 6 and 10) for the schwertmannite nanostructures. And all final schwertmannite particles had the chemical formulas of Fe8O8(OH)8−2 x(SO4) x (1.08 ≤ x ≤ 1.66), especially as Cl−/SO4 2− = 0, the visible “pincushions” only being the outermost sections of the whole needles existing in a tightly spherical assemblage of schwertmannite. Moreover, the absence of ferrihydrite and goethite was determined in the nanodimension of these needles, though the initial Fe and SO4 2− were 5600 and of 9600 µg/mL, respectively. It could be induced by the amounts and activities of aqueous Fe, SO4 2−, and Cl− associated with cellular activities and mineral precipitation. This study will be useful for understanding the actual occurrence of iron oxyhydroxide nanostructure and better developing its potential environmental application.

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GSH‐Depleted Nanozymes with Dual‐Radicals Enzyme Activities for Tumor Synergic Therapy

Wang

Qin

et al. 2021

Adv Funct Materials

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Although inspiring progress has been achieved in tumor nanocatalytic therapies based on tailor‐made nanozymes for converting hydrogen peroxide into reactive oxygen species (ROS) efficiently, most cytotoxic hydroxyl radicals do not spread far enough within a cell to damage the primary organelles for effective tumor therapy due to their short half‐life time (≈1 µs). Developing a novel nanocatalyst platform involving longer half‐life time ROS is desired. To this end, Fe3O4‐Schwertmannite nanocomposites (Fe3O4‐Sch) with triple‐effect tumor therapy are constructed through a facile method. The Schwertmannite shell converts the •OH produced by Fe3O4 via the Fenton reaction into sulfate radicals with a longer half‐life time (30 µs). Combination of dual radicals exhibits overwhelming tumor inhibition efficacy. The nanocomposites also show the multifunctionality of good photothermal efficiency (33.2%) and synergistic oxidative stress amplification upon glutathione biosynthesis (GSH) depletion by the l‐buthionine sulfoximine (BSO) molecules loaded in the hollow Fe3O4 cores. The comprehensive properties of the nanoplatform including the dual‐radical production, Fe3O4 nanocrystal mediated PTT, and the BSO mediated GSH depletion result in remarkable tumor inhibition both in vitro and in vivo, which may pave a way to constructing a synergic catalytic nanoplatform for efficient tumor therapy.

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Schwertmannite: occurrence, properties, synthesis and application in environmental remediation

Abstract: Schwertmannite is a typical iron-derived mineral, which was originally discovered in acid mine drainings and subsequently synthesized in the laboratory.

Cited by 62 publications

References 100 publications

Regeneration of a deactivated surface functionalised polyacrylonitrile supported Fenton catalyst for use in wastewater treatment

Regeneration of a deactivated surface functionalised polyacrylonitrile supported Fenton catalyst for use in wastewater treatment

Anionic effect on nanostructure and morphology of bio-schwertmannite dynamically produced within cellular reproduction

GSH‐Depleted Nanozymes with Dual‐Radicals Enzyme Activities for Tumor Synergic Therapy

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