Visible light responsive vanadium-substituted hydroxyapatite photocatalysts

Nishikawa, Masami; Tan, Lee Hua; Nakabayashi, Yukihiro; Hasegawa, Takahiro; Shiroishi, Wataru; Kawahara, Seiichi; Saito, Nobuo; Nosaka, Atsuko Y.; Nosaka, Yoshio

doi:10.1016/j.jphotochem.2015.06.005

Cited by 22 publications

(4 citation statements)

References 27 publications

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“…The V 2p spectrum depicted in Figure a shows a sharp peak at 517.1 eV (2p 3/2 ) and 525.8 eV (2p 1/2 ) corresponding to V 5+ ions along with 523.9 eV (2p 1/2 ) conforming to V 4+ ions. Similar results have also been reported by Nishikawa et al Figure b depicts the V 2p spectrum of V 2 O 5 -HAP. It was observed that the V 5+ (525.1 eV) of the 2p 1/2 peak was much more pronounced as compared with V-HAP.…”

Section: Resultssupporting

confidence: 89%

“…The V 2p spectrum depicted in Figure 5a shows a sharp peak at 517.1 eV (2p 3/2 ) and 525.8 eV (2p 1/2 ) corresponding to V 5+ ions along with 523.9 eV (2p 1/2 ) conforming to V 4+ ions. Similar results have also been reported by Nishikawa et al 32 The HMF oxidation was conducted with catalysts with varying doping contents of vanadium. It was observed that as the amount of vanadium doping increased from x = 0 to x = 4.5, the HMF conversion and DFF yield increased.…”

Section: ■ Results and Discussionsupporting

confidence: 88%

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Exploiting an Efficient and Stable Catalyst for the Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Diformylfuran by Incorporating Vanadium in the Framework of Hydroxyapatite

Patria

Kumar

Luo

et al. 2022

ACS Sustainable Chem. Eng.

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Hydroxyapatite displays immense potential in catalysis because of its properties to form doped single and multiphasic systems. In the present study, vanadium-incorporated hydroxyapatite was investigated for aerobic oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran. The amount of vanadium precursor and the pH in catalyst synthesis were significant factors in defining the catalytic properties of V-HAP. The morphologies and structures of the catalysts were well studied. Field emission scanning electron microscopy revealed different morphologies of the catalyst with varying amounts of vanadium and pH, suggesting that both these factors play a critical role in determining the catalytic properties. Through X-ray diffraction spectra, the incorporation of vanadium ions into the HAP framework by replacing phosphate ions was confirmed by the augmentation of lattice parameters and unit cell volume. The vanadium amount corresponding to x = 3 and pH 11 for the synthesis of the catalyst displayed good catalytic efficiency for HMF conversion. To further enhance the performance of the synthesized catalyst, the reaction parameters such as the temperature of reaction and catalyst loading were optimized. Under optimum reaction conditions, 78% HMF conversion with 63 and 81% DFF yield and selectivity, respectively, was observed. V-HAP (x = 3) was highly stable in nature and did not show a decrease in activity during experimental cycles, thereby showing that the incorporated vanadium did not leach out and that the catalyst was recyclable, which was also confirmed by energy-dispersive X-ray spectroscopy results. V-HAP (x = 3) was also compared with V2O5-HAP and was found to have superior catalytic properties as compared to the latter. This study contributes to the development of green and stable catalysts for biomass conversion.

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Section: Resultssupporting

confidence: 89%

Section: ■ Results and Discussionsupporting

confidence: 88%

Exploiting an Efficient and Stable Catalyst for the Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Diformylfuran by Incorporating Vanadium in the Framework of Hydroxyapatite

Patria

Kumar

Luo

et al. 2022

ACS Sustainable Chem. Eng.

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“…Vukomanovic et al 34 designed and fabricated platinum (Pt 0 and Pt n+ )-HAp nanocomposites, which are photocatalytically active both under UV and visible irradiation. Substituting calcium (Ca) ions of HAp lattice by vanadium (V) ions (V:HAp), Nishikawa et al 35 could induce photocatalytic activity in HAp under visible light illumination. The substituted pentavalent V ions at bivalent Ca sites generate Ca vacancies in HAp lattice to maintain its electrical neutrality when calcinated at 400 C. The V ions in the HAp lattice seemed to play a role of electron acceptor and the redox potential of the level due to the V ions was negative enough to reduce O 2 molecule into H 2 O 2 .…”

Section: Introductionmentioning

confidence: 99%

Plasmon induced enhanced photocatalytic activity of gold loaded hydroxyapatite nanoparticles for methylene blue degradation under visible light

2017

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“…On the other hand vanadium as a dopant in photocatalytic processes has been widely studied for applications such as decomposition of organic dye water pollutants [38]- [42] to the oxidation of mercury (Hg 0 ) [43], reduction of oxygen to peroxide [44], reduction of nitrogen oxides (NOx) [45], [46] and degradation of formaldehyde [47]. In all these photocatalytic processes, vanadium either enhanced the visible-light activity of TiO2 or was employed as the catalyst itself, with the ability to photocatalyse the decomposition of pollutants in the visible-light region.…”

Section: Photocatalytic Applications Of Vanadiummentioning

confidence: 99%

Earth Abundant Metals as Cost Effective Alternatives in Photocatalytic Applications: A Review

Nkabiti

Baker

2020

AMR

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In a quest for a cleaner planet and to have alternative forms of energy generation apart from the fossil-based power supply, fuel cell technology has emerged as an alternative energy source for usage across all economic sectors. The application of this age-old technology is found in alkaline (AFC), molten carbonate (MCFC), phosphoric acid (PAFC), polymer electrolyte membrane (PEMFC) and solid oxide (SOFC) fuel cells. These fuel cells are named based on the type of electrolyte employed in their applications and the fuel of choice for energy generation is hydrogen. This fuel can be used in its pure form or extracted from other sources such as methanol, water and syngas. Ammonia in its liquefied and gaseous forms may be used as a non-carbonaceous fuel for the hydrogen source in some of these fuel cell technologies due to its safety, lower price, ease of storage and transportation. In this review, all the fuel cells will be investigated in their capability of using ammonia as a direct fuel. The role of earth abundant metal catalysts in comparison to TiO2 was evaluated in terms of molecular orbital theory and in the decomposition of organic compounds and other material into nitrogen and hydrogen products under the visible light radiation. The p-orbital participation in earth abundant metals or metal oxides doping, emerged as a strong contribution to bandgap attenuation.

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Visible light responsive vanadium-substituted hydroxyapatite photocatalysts

Cited by 22 publications

References 27 publications

Exploiting an Efficient and Stable Catalyst for the Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Diformylfuran by Incorporating Vanadium in the Framework of Hydroxyapatite

Exploiting an Efficient and Stable Catalyst for the Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Diformylfuran by Incorporating Vanadium in the Framework of Hydroxyapatite

Plasmon induced enhanced photocatalytic activity of gold loaded hydroxyapatite nanoparticles for methylene blue degradation under visible light

Earth Abundant Metals as Cost Effective Alternatives in Photocatalytic Applications: A Review

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