Visible light to switch-on desorption from goethite

Šutka, Anna; Järvekülg, Martin; Gross, Kārlis Agris; Kook, Mati; Käämbre, Tanel; Visnapuu, Meeri; Trefalt, Gregor; Šutka, Andris

doi:10.1039/c8nr09547g

Cited by 12 publications

(10 citation statements)

References 16 publications

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“…The bandgap value 2.33 eV for goethite (direct transition) was observed from optical absorption versus photon energy plots (αhν) 2 , as demonstrated in ESI Figure S2c. The observed bandgap value for goethite is in good agreement with previously reported values [25].…”

Section: Feooh → Fe O + H O (9)supporting

confidence: 92%

“…However, the photo-Fenton activity for hematite nanoparticles obtained by a thermal transformation from various iron-bearing nanoparticle precursors has not yet been studied so far. At the same time, there are broad research possibilities because several nanoparticle shapes have been synthesized for iron oxides and oxyhydroxides, for example, nanoplates [24], nanowires [25], nanostructured urchin-like hollow spheres [26] and nanotubes [27]. This allows one to potentially obtain a large variety of different hematite nanostructures, with a potential to produce highly active photo-Fenton catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Identifying Iron-Bearing Nanoparticle Precursor for Thermal Transformation into the Highly Active Hematite Photo-Fenton Catalyst

Šutka

Vanags

et al. 2020

Catalysts

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The hematite photo-Fenton catalysis has attracted increasing attention because it offers strong oxidation of organic pollutants under visible light at neutral pH. In the present work, aqueous synthesis of hematite photo-Fenton catalysts with high activity is demonstrated. We compare photo-Fenton activity for hematite obtained by hydrolyzation at 60 °C or by a thermally induced transformation from iron-bearing nanoparticles, such as amorphous iron oxyhydroxide or goethite. A link between their structure and visible light photo-Fenton reactivity is established. The highest activity was observed for hematite obtained from goethite nanowires due to oblong platelet-like structure, high surface area and the presence of nanopores.

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Section: Feooh → Fe O + H O (9)supporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Identifying Iron-Bearing Nanoparticle Precursor for Thermal Transformation into the Highly Active Hematite Photo-Fenton Catalyst

Šutka

Vanags

et al. 2020

Catalysts

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“…600 nm: 2.1 eV), [6d] or α‐FeOOH ( ca . 620–497 nm: 2.0–2.5 eV), [6e–f] which is confirmed as a by‐product. It also suggested that the broad absorption over ca .…”

Section: Resultsmentioning

confidence: 70%

Heterogeneous Fenton Degradation of Organic Pollutants in Water Enhanced by Combining Iron‐type Layered Double Hydroxide and Sulfate

Fuku

Kanai

Todoroki

et al. 2021

Chemistry An Asian Journal

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Water pollution derived from organic pollutants is one of the global environmental problems. The Fenton reaction using Fe 2 + as a homogeneous catalyst has been known as one of clean methods for oxidative degradation of organic pollutants. Here, a layered double hydroxide (Fe 2 + Al 3 + -LDH) containing Fe 2 + and Al 3 + in the structure was used to develop a "heterogeneous" Fenton catalyst capable of mineralizing organic pollutants. We found that sulfate ion (SO 4 2À ) immobilized on the Fe 2 + Al 3 + -LDH significantly facilitated oxidative degradation (mineralization) of phenol as a model compound of water pollutants to carbon dioxide (CO 2 ) in a heterogeneous Fenton process. The phenol conversion and mineralization efficiency to CO 2 reached > 99% and ca. 50%, respectively, even with a reaction time of only 60 min.

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“…α-Fe 2 O 3 was prepared by co-precipitation method followed by calcination, as described in our previous works [14,21]. Briefly, 0.1 M iron(III) nitrate solution was prepared, after adding a 0.4 M NaOH solution.…”

Section: Synthesis Of the Agmentioning

confidence: 99%

Visible-Light Active Flexible and Durable Photocatalytic Antibacterial Ethylene-co-vinyl Acetate—Ag/AgCl/α-Fe2O3 Composite Coating

et al. 2022

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When particles are mixed in polymer, particle surfaces become passivated by polymer matrix, leading to significantly reduced photocatalytic and, thus, also reduced antibacterial activity, as the catalytic particles become isolated from the outer environment and microorganisms reaching the surface. Herein, we demonstrate a facile and rapid approach for coating preparation at room temperature, yielding good adhesion of particles in combination with the particles’ interface location. Flexible ethylene-co-vinyl acetate Ag/AgCl/α-Fe2O3 composite coatings were prepared by the spin-coating method. The synthesized photocatalytically active coating surface exhibited a distinct and rapid inhibition of bacterial growth, with at least a 7-log reduction of gram-positive bacteria Staphylococcus aureus viability after 30 min of visible-light illumination. We also analyzed the shedding of the Ag-ions and reactive oxygen species production from the composite coating and showed that reactive oxygen species played the main role in the photocatalytic bacterial inactivation, destroying the bacteria cell as proven by the Confocal Laser Scanning Microscopy.

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Visible light to switch-on desorption from goethite

Abstract: Switching adsorption–desorption by visible light would provide the possibility for a wide range of applications that require controlled release-on-demand.

Cited by 12 publications

References 16 publications

Identifying Iron-Bearing Nanoparticle Precursor for Thermal Transformation into the Highly Active Hematite Photo-Fenton Catalyst

Identifying Iron-Bearing Nanoparticle Precursor for Thermal Transformation into the Highly Active Hematite Photo-Fenton Catalyst

Heterogeneous Fenton Degradation of Organic Pollutants in Water Enhanced by Combining Iron‐type Layered Double Hydroxide and Sulfate

Visible-Light Active Flexible and Durable Photocatalytic Antibacterial Ethylene-co-vinyl Acetate—Ag/AgCl/α-Fe2O3 Composite Coating

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