SYNTHESIS AND CHARACTERIZATION OF FeO NANOPARTICLES BY HYDROTHERMAL METHOD

Gurushankar, K.; Chinnaiah, K.; Kannan, Karthik; Gohulkumar, M.; Periyasamy, Prabu

doi:10.31788/rjc.2021.1436299

Cited by 6 publications

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“…In addition, it can be observed that the narrowing of peaks (101) of ZnO nanoparticles increases with the calcination temperature due to the improvement in crystallinity after the calcination . Further, the crystallite size of ZnO nanoparticles at different temperatures has been estimated from the full width at half-maximum (fwhm) according to the Debye–Sherrer formula, as shown in eq . D = k λ β cos θ where k is the shape factor (0.94), λ is the X-ray wavelength, β is the full width at half-maximum (fwhm), and θ is the Bragg angle . The crystallite sizes of all samples were estimated with the (1 0 1) diffraction peak.…”

Section: Resultsmentioning

confidence: 99%

“…where k is the shape factor (0.94), λ is the X-ray wavelength, β is the full width at half-maximum (fwhm), and θ is the Bragg angle. 34 The crystallite sizes of all samples were estimated with the (1 0 1) diffraction peak. The crystalline sizes of ZnO nanoparticles at calcination temperatures of 400, 500, 600, 700, and 800 °C were 34, 36, 38, 39, and 40 nm, respectively, as shown in Table 1.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Polymer-Assisted Coprecipitation Synthesized Zinc Oxide Nanoparticles and Their Uses for Green Chemical Synthesis via Photocatalytic Glucose Conversions

Kaewsaenee,

Singhaset,

Roongraung

et al. 2023

ACS Omega

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Biomass conversions to chemicals via various conventional technologies require high energy consumption, high temperature, high pressure, or high system cost. Alternatively, photocatalysis is one of the greener technologies because it utilizes the energy from lamps or natural sunlight with catalysts to synthesize chemicals under mild conditions and room temperature. In this work, zinc oxide (ZnO) particles were successfully synthesized using polyvinylpyrrolidone as an additive in coprecipitation to control the size and protect the aggregation. The crystal structure of hexagonal wurtzite was found in the obtained nanoparticles. The photocatalytic activities of the obtained samples were evaluated for the production of high-value chemicals (gluconic acid, xylitol, arabinose, and formic acid) via the photocatalytic conversion of glucose under UV-A irradiation. The photocatalytic results indicated the relationship of defects (i.e., oxygen vacancies and zinc vacancies) with glucose conversions. From the ZnO nanoparticles calcined at various temperatures from 400 to 700 °C, the one calcined at 700 °C showed the highest glucose conversion of 21.5% with a high yield of carboxylic acid products (gluconic acid and formic acid). The gluconic acid showed the highest yield of 15% for 180 min, while the formic acid, arabinose, and xylitol presented the highest yields of 7, 1, and 0.5% for 180 min, respectively. Pure ZnO nanoparticles can convert glucose into value-added products without adding an acid or base in the reaction.

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