Effect of Ce and Cu co-doping on the structural, morphological, and optical properties of ZnO nanocrystals and first principle investigation of their stability and magnetic properties

Mary, J. Arul; Vijaya, J. Judith; Bououdina, M.; Kennedy, L. John; Dai, Jianhong; Song, Yajie

doi:10.1016/j.physe.2014.10.019

Cited by 27 publications

(4 citation statements)

References 60 publications

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“…Therefore, the further nanostructure growth at all ZnO dimensions decreases. It has been reported that doping ZnO with Ce and Cu ions can form Zn–Ce–Cu–O in the crystal lattice and decrease the size of the nanoparticles (Mary et al, 2015 ). The smaller particles can provide with increased reactive sites promoting photocatalysis.…”

Section: Resultsmentioning

confidence: 99%

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High Efficient Visible-Light Photocatalytic Performance of Cu/ZnO/rGO Nanocomposite for Decomposing of Aqueous Ammonia and Treatment of Domestic Wastewater

Hou

Petropoulos

et al. 2018

Front. Chem.

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Photocatalytic removal of ammonium-nitrogen (NH4+-N) from water using solar energy is an approach of high interest and applicability due to the convenience in application. ZnO has a great potential in photocatalytic decomposition of NH4+-N and conversion of this nutrient to under visible light irradiations. However the applicability of pristine ZnO though is limited due to its reduced capacity to utilize light from natural light. Herein, we report a two-step ZnO-modified strategy (Cu-doped ZnO nanoparticles, immobilized on reduced graphene oxide (rGO) sheets) for the promotion of photocatalytic degradation of NH4+-N under visible light. UV-Vis spectra showed that the Cu/ZnO/rGO can be highly efficient in the utilization of photons from the visible region. Hence, Cu/ZnO/rGO managed to demonstrate adequate photocatalytic activity and effective NH4+-N removal from water under visible light compared to single ZnO. Specifically, up to 83.1% of NH4+-N (initial concentration 50 mg·L−1, catalyst dosage 2 g·L−1, pH 10) was removed within 2 h retention time under Xe lamp irradiation. From the catalysis, the major by-product was N2. The high ammonia degradation efficiency from the ZnO/Cu/rGO is attributed to the improvement of the reactive oxygen species (ROSs) production efficiency and the further activation of the interfacial catalytic sites. This study also demonstrated that such nanocomposite is a recyclable agent. Its NH4+-N removal capacity remained effective even after five batch cycles. In addition, Cu/ZnO/rGO was applied to treat real domestic wastewater, and it was found that chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) removal efficiencies can reach 84.3, 80.7, and 90.3%, respectively. Thus, Cu/ZnO/rGO in the presence of solar light can be a promising photocatalyst in the field of wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

“…The smaller particles can provide with increased reactive sites promoting photocatalysis. Smaller particles have the tendency to interact with nanoparticles, resulting to irregular shapes (Mary et al, 2015 ).…”

Section: Resultsmentioning

confidence: 99%

High Efficient Visible-Light Photocatalytic Performance of Cu/ZnO/rGO Nanocomposite for Decomposing of Aqueous Ammonia and Treatment of Domestic Wastewater

Hou

Petropoulos

et al. 2018

Front. Chem.

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“…The reduction in size is associated to the nucleation mechanism in the growth process. The addition of Cu control the nucleation rate and hindering the growth rate in the Zn-Co-Cu-O lattice due to the dissimilarities in the ionic radius between Cu 2+ and Zn 2+ ions [67,68]. This is con rmed by the XRD spectra which re ects the de-generated crystallization quality by Cu-doping.…”

Section: Sem and Tem -Microstructural Studiesmentioning

confidence: 91%

Investigation on microstructure, energy gap, photoluminescence and magnetic studies of Co and Cu in situ doped ZnO nanostructures

Prabakar¹,

Muthukumaran²,

Raja³

2021

J Mater Sci: Mater Electron

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Co (3%) doped ZnO and Co, Cu (Co = 3% and Cu = 2 to 4%) dual doped ZnO nanostructures have been prepared using chemical co-precipitation route. Structural analysis indicated that no alteration in hexagonal structure of ZnO and the absence of secondary / impurity phases were detected by Co/Cu addition into ZnO. The size reduction at Cu = 2% is due to the suppression of growth rate and the dissimilarities between Co 2+ /Cu 2+ and Zn 2+ and improved size at Cu = 4% is responsible for the more defect sites in Zn-O lattice. The constant c/a ratio (~ 1.602) signi ed that absence of structural modi cation by Co/Cu substitution. The modi cation in optical absorption, transmittance and energy gap of ZnO by Co/Cu addition was discussed by dopants and the stimulated defect states. The continuous widening of energy gap with Cu substitution is clari ed using Burstein-Moss (BM) band lling effect through energy level diagram. The existence of Zn-O and Zn-Co/Cu-O bonding was veri ed by Fourier transform infra-red analysis. The elevated intensity ratio between green and ultraviolet photoluminescence (I G /I UV) at higher Cu concentrations revealed the occurrence of more defects particularly oxygen related defect states in Zn-Co-Cu-O lattice. The observed room temperature ferromagnetism (RTFM) in Co, Cu doped ZnO nanostructures is discussed based on the oxygen vacancy mediated bound magnetic polarons (BMP) and the exchange coupling among the free electrons and local spin polarized electrons.

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“…This slight shift is due to the composed structural strain [29]. This effect is caused by doping the CuO film with artificial sweat that includes several ions (Na þ , K þ , lactate À and urea þ ) that have different radii than that of the Cu 2 þ ion.…”

Section: X-ray Characterizationmentioning

confidence: 99%

Hydration detection through use of artificial sweat in doped- and partially-doped nanostructured CuO films

Şahin

Alomari

Kaya

2015

Ceramics International

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Effect of Ce and Cu co-doping on the structural, morphological, and optical properties of ZnO nanocrystals and first principle investigation of their stability and magnetic properties

Cited by 27 publications

References 60 publications

High Efficient Visible-Light Photocatalytic Performance of Cu/ZnO/rGO Nanocomposite for Decomposing of Aqueous Ammonia and Treatment of Domestic Wastewater

High Efficient Visible-Light Photocatalytic Performance of Cu/ZnO/rGO Nanocomposite for Decomposing of Aqueous Ammonia and Treatment of Domestic Wastewater

Investigation on microstructure, energy gap, photoluminescence and magnetic studies of Co and Cu in situ doped ZnO nanostructures

Hydration detection through use of artificial sweat in doped- and partially-doped nanostructured CuO films

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