Electroless deposition and characterization of Fe/FeOx nanoparticles on porous carbon microspheres: structure and surface reactivity

Duffy, Paul; Cullen, Ronan J.; Jayasundara, Dilushan R.; Murphy, David J.; Fonda, Emiliano; Colavita, Paula E.

doi:10.1039/c3ta10678k

“…X‐ray absorption near edge structure (XANES) and extended X‐ray absorption fine structure (EXAFS) spectra were collected to further explore the electronic structure and local coordination environment of mineral photocatalysts using Fe foil and Fe 2 O 3 as references. According to the normalized Fe K‐edge XANES spectra, iron in the Z‐Scheme RM sample is present in two forms of Fe 3+ and Fe 0 (Figure 2c), corresponding to Fe 2 O 3 and Fe phases, respectively [16] . For the Fourier transform (FT) spectra at the K‐edge, the first peak in the R space of RM is assigned to Fe−O bonds with a bond length of ≈1.45 Å.…”

Section: Resultsmentioning

confidence: 99%

“…According to the normalized Fe K-edge XANES spectra, iron in the Z-Scheme RM sample is present in two forms of Fe 3 + and Fe 0 (Figure 2c), corresponding to Fe 2 O 3 and Fe phases, respectively. [16] For the Fourier transform (FT) spectra at the K-edge, the first peak in the R space of RM is assigned to FeÀ O bonds with a bond length of � 1.45 Å. The peak around 2.5 Å is originated from the FeÀ (O)À Fe x pair interactions of the second coordination shell (Figure 2d).…”

Section: Structure Evolution and Microstructuresmentioning

confidence: 99%

Mimicking Photosynthesis: A Natural Z‐Scheme Photocatalyst Constructed from Red Mud Bauxite Waste for Overall Water Splitting

Yu

¹

,

Xu

²

,

Wang

³

et al. 2023

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All-solid-state Z-Scheme photocatalysts have attracted significant attention due to their great potential for solar fuel production. However, delicately coupling two individual semiconductors with a charge shuttle by a material strategy remains a challenge. Herein, we demonstrate a new protocol of natural Z-Scheme heterostructures by strategically engineering the component and interfacial structure of red mud bauxite waste. Advanced characterizations elucidated that the hydrogen-induced formation of metallic Fe enabled the effective Z-Scheme electron transfer from γ-Fe 2 O 3 to TiO 2 , leading to the significantly boosted spatial separation of photo-generated carriers for overall water splitting. To the best of our knowledge, it is the first Z-Scheme heterojunction based on natural minerals for solar fuel production. Thus our work provides a new avenue toward the utilization of natural minerals for advanced catalysis applications.

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“…The removal of Cr(VI) from activated carbon is mainly due to the high adsorption of the material. Studies [17,50,51] have shown the formation of a micro-electrolysis effect between iron and carbon, hence accelerating the reaction and enhancing the removal efficiency.…”

Section: Performance Of Nzvi-mac For Cr(vi) Removalmentioning

confidence: 99%

Preparation of Activated Carbon Supported Bead String Structure Nano Zero Valent Iron in a Polyethylene Glycol-Aqueous Solution and Its Efficient Treatment of Cr(VI) Wastewater

Jiao

¹

,

Tan

²

,

Lin

³

et al. 2019

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Nanometer zero-valent iron (nZVI) has been widely used in the treatment of heavy metals such as hexavalent chromium (Cr(VI)). A novel composite of bead string-structured nZVI on modified activated carbon (nZVI-MAC) is prepared here, using polyethylene glycol as the stable dispersant rather than traditional ethanol during the loading process. The microstructure characterization shows that nZVI particles are loaded on MAC with a bead string structure in large quantity and stably due to the addition of hydroxyl functional groups on the surface by polyethylene glycol. Experiments on the treatment of Cr(VI) in wastewater show that the reaction process requires only 20 min to achieve equilibrium. The removal rate of Cr(VI) with a low concentration (80-100 mg/L) is over 99% and the maximum saturation removal capacity is up to 66 mg/g. The system converts Cr(VI) to trivalent chromium (Cr(III)) through an oxidation-reduction effect and forms an insoluble material with iron ions by coprecipitation, which is then adsorbed on the surface of the nZVI-MAC. The process conforms to the quasi-second order adsorption kinetics equation (mainly chemical adsorption process).

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Mimicking Photosynthesis: A Natural Z‐Scheme Photocatalyst Constructed from Red Mud Bauxite Waste for Overall Water Splitting

Yu

¹

,

Xu

²

,

Wang

³

et al. 2023

Angewandte Chemie

2

0

View full text Add to dashboard Cite

All-solid-state Z-Scheme photocatalysts have attracted significant attention due to their great potential for solar fuel production. However, delicately coupling two individual semiconductors with a charge shuttle by a material strategy remains a challenge. Herein, we demonstrate a new protocol of natural Z-Scheme heterostructures by strategically engineering the component and interfacial structure of red mud bauxite waste. Advanced characterizations elucidated that the hydrogen-induced formation of metallic Fe enabled the effective Z-Scheme electron transfer from γ-Fe 2 O 3 to TiO 2 , leading to the significantly boosted spatial separation of photo-generated carriers for overall water splitting. To the best of our knowledge, it is the first Z-Scheme heterojunction based on natural minerals for solar fuel production. Thus our work provides a new avenue toward the utilization of natural minerals for advanced catalysis applications.

show abstract

Electroless deposition and characterization of Fe/FeOx nanoparticles on porous carbon microspheres: structure and surface reactivity

Cited by 4 publications

References 52 publications

Mimicking Photosynthesis: A Natural Z‐Scheme Photocatalyst Constructed from Red Mud Bauxite Waste for Overall Water Splitting

Mimicking Photosynthesis: A Natural Z‐Scheme Photocatalyst Constructed from Red Mud Bauxite Waste for Overall Water Splitting

Preparation of Activated Carbon Supported Bead String Structure Nano Zero Valent Iron in a Polyethylene Glycol-Aqueous Solution and Its Efficient Treatment of Cr(VI) Wastewater

Mimicking Photosynthesis: A Natural Z‐Scheme Photocatalyst Constructed from Red Mud Bauxite Waste for Overall Water Splitting

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