Assessment of synthesis approaches for tuning the photocatalytic property of ZnO nanoparticles

Basnet, Parita; Samanta, Dhrubajyoti; Chanu, T. Inakhunbi; Mukherjee, Jaya; Chatterjee, Somenath

doi:10.1007/s42452-019-0642-x

Cited by 78 publications

(28 citation statements)

References 71 publications

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“…The hexagonal wurtzite structure is confirmed from the typical diffraction peaks for (1 0 0), (0 0 2), and (1 0 1) planes located at 32.5, 35.5, and 37.3° of 2θ, respectively, with a high degree of crystallization and approximately similar to the standard data of pure ZnO ( a = 3.2488 Å, c = 5.2061 Å, space group P 63 mc ) and very well-matched with JCPDS # 36-1451. 20 The XRD spectrum shows three broad peaks indexed as (1 0 0), (0 0 2), and (1 0 1) for each sample, showing that the nature of the prepared nanoparticles is polycrystalline. In all the samples, nine major peaks are observed, which are indexed as (1 0 0), (0 0 2), (1 0 1), (1 0 2), (1 1 0), (1 0 3), (2 0 0), (1 1 2), and (2 0 1) with maximum diffraction intensity at (1 0 1) lying between 35.8 and 37.6°.…”

Section: Resultsmentioning

confidence: 92%

Room-Temperature Ferromagnetism in Cu/Co Co-Doped ZnO Nanoparticles Prepared by the Co-Precipitation Method: For Spintronics Applications

et al. 2022

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In current work, pure ZnO and Zn 0.96– x Cu 0.04 Co x O (0 ≤ x ≤ 0.05) nanoparticles were synthesized by the co-precipitation method. Structural analysis and phase determination of the formed nanoparticles was carried out using X-ray diffraction (XRD) and Williamson–Hall plots. The hexagonal wurtzite structure was manifested by all the samples with divergent microstructures. The change in lattice parameters, bond length, dislocation density, and lattice strain indicates that Cu and Co were successfully incorporated. Average crystallite size was found to be in the range of 32.16–45.42 nm for various doping concentrations. Field emission scanning electron microscopy results exhibited that the surface morphology is an amalgam of spherical-like and hexagon-like structures. Spherical-shaped grains were homogeneous and evenly distributed all over the structure. Fourier transform infrared spectra indicated that the absorption bands were blue-shifted with increasing Co concentration. The UV–visible absorption spectra showed high absorption in the UV region and weak absorption in the visible region. An increase in the energy band gap for the maximum absorption peak was observed from 3.49 eV for ZnO to 3.88 eV for Zn 0.91 Cu 0.04 Co 0.05 O. The Burstein–Moss effect explained the noticed blue shift in absorption spectra and energy band gaps. The vibrating sample magnetometer study revealed the change in the diamagnetic behavior of pure ZnO to the ferromagnetic behavior of the prepared nanoparticles at room temperature for different doping concentrations. In the current study, we have developed the room-temperature ferromagnetism (RTFM) for Cu and Co co-doped ZnO nanoparticles. Since RTFM is the key objective for dilute magnetic semiconductors, therefore it can be served as the desirable expectant for spintronics applications with improved functionalities and device concepts.

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Section: Resultsmentioning

confidence: 92%

Room-Temperature Ferromagnetism in Cu/Co Co-Doped ZnO Nanoparticles Prepared by the Co-Precipitation Method: For Spintronics Applications

et al. 2022

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“…TiO 2 and ZnO followed JCPDS No. 73-1764 and 36-1451, respectively (Basnet et al, 2019) . The structure of Ni/Al-LDH, TiO 2 , and ZnO in composite Ni/Al-TiO 2 and Ni/Al-ZnO was consistent, which also indicated that the preparation of composite did not change the form of precursors (see Figures 2d and 2e).…”

Section: Resultsmentioning

confidence: 99%

Catalytic Oxidative Desulfurization of Dibenzothiophene by Composites Based Ni/Al-Oxide

Ahmad

Wijaya

Amri

et al. 2022

Sci. Technol. Indones

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In the present study, composite layer double hydroxide-metal oxide (Ni/Al-TiO2 and Ni/Al-ZnO) was successfully prepared and used as catalyst of oxidative desulfurization of dibenzothiophene. Characterization of catalyst was used XRD, FTIR, and SEM-EDS. The structure of Ni/Al-LDH, TiO2, and ZnO in composite Ni/Al-TiO2 and Ni/Al-ZnO was consistent, which also indicated that the preparation of composite did not change the form of precursors. FTIR spectra of Ni/Al-TiO2 and Ni/Al-ZnO absorption band at 3398, 1639, 1339, 832, 731, and 682 cm−1. The catalysts have an irregular structure, TiO2 and ZnO adhere to the surface of Ni/Al LDH. The percent mass of Ti and Zn on the composite at 29.3% and 18.2%, respectively. The acidity of Ni/Al LDH increased after being composited with TiO2 and ZnO. The optimum reaction time, dosage catalyst, and temperature were 30 min, 0.25 g, and 50°C, respectively, and n-hexane as a solvent. The percentage conversion of dibenzothiophene on Ni/Al-LDH, TiO2, ZnO, Ni/Al-TiO2, and Ni/Al-ZnO were 99.44%, 91.92%, 95.36%, 99.88%, and 99.90%, respectively. The catalysts are heterogeneous system and the advantage is that can be used for reusability. After 3 times catalytic reactions, the conversion of dibenzothiophene still retains more than 80%, even Ni/Al-TiO2 and Ni/Al-ZnO composites still 97.79% and 98.99%, respectively.

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“…Secondly, the specific surface areas of the calcined samples are The PXRD diagrams for the calcined samples are included in Figure 1. The peaks of the LDH structure are no longer recorded, and the positions of the peaks are very close to those of ZnO, zincite (JCPDS standard n • 36-1451) [31].…”

Section: Characterization Of the Samplesmentioning

confidence: 91%

Activity in the Photodegradation of 4-Nitrophenol of a Zn,Al Hydrotalcite-Like Solid and the Derived Alumina-Supported ZnO

2020

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A Zn,Al layered double hydroxide (LDH), with the hydrotalcite structure and the mixed oxide obtained upon its calcination at 650 °C, was tested in the adsorption and photocatalytic degradation of 4-Nitrophenol in aqueous solution. The Zn,Al LDH was fast and easily obtained by the coprecipitation method. Hydrothermal treatment under microwave irradiation was applied to compare the effect of the ageing treatment on the photocatalytic behavior. The efficiency of the synthetized solids was compared to that of a commercial ZnO. The ageing treatment did not improve the performance of the original samples in the degradation of 4-nitrophenol. The activity of the synthetized solids tested exceeded that observed for the reaction with commercial ZnO. The photocatalytic performance of the original non-calcined hydrotalcite is similar to that of commercial ZnO. The calcined hydrotalcite showed a better performance in the adsorption-degradation of the contaminant than ZnO, and its reusability would be possible as it recovered the hydrotalcite-like structure during the reaction.

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Assessment of synthesis approaches for tuning the photocatalytic property of ZnO nanoparticles

Cited by 78 publications

References 71 publications

Room-Temperature Ferromagnetism in Cu/Co Co-Doped ZnO Nanoparticles Prepared by the Co-Precipitation Method: For Spintronics Applications

Room-Temperature Ferromagnetism in Cu/Co Co-Doped ZnO Nanoparticles Prepared by the Co-Precipitation Method: For Spintronics Applications

Catalytic Oxidative Desulfurization of Dibenzothiophene by Composites Based Ni/Al-Oxide

Activity in the Photodegradation of 4-Nitrophenol of a Zn,Al Hydrotalcite-Like Solid and the Derived Alumina-Supported ZnO

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