Cu doped ZnO microballs as effective sunlight driven photocatalyst

Meshram, Satish P.; Adhyapak, Parag V.; Amalnerkar, Dinesh; Mulla, I.S.

doi:10.1016/j.ceramint.2016.01.154

Cited by 48 publications

(15 citation statements)

References 33 publications

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“…Decreased diffraction peak intensities were observed in Cu/ZnO and Cu/ZnO/rGO due to the substitution of Cu ion by ZnO crystal lattice at the Zn 2+ sites. This replacement can be attributed to the fact that ionic radii (0.73 Å) of Cu 2+ is close to that of Zn 2+ (0.74 Å) (Meshram et al, 2016 ). It is difficult to see the rGO peaks in Cu/ZnO/rGO which may be due to the low content of rGO as well as the variation of the stacking mode of r caused by the incorporation of the ZnO nanostructures.…”

Section: Resultsmentioning

confidence: 99%

“…The decrease in the particles size will increase the specific surface area and provide with larger active surface, which consequently would lead to a higher interfacial charge carrier transfer for photocatalysis. Cu ions doped with ZnO or TiO 2 have also been reported capable to enhance the methyl orange, phenol and humic substances degradation efficiency (Maleki et al, 2015 ; Zhang et al, 2015 ; Meshram et al, 2016 ).…”

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%

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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“…This process is crucial for various materials especially semiconductors since intrinsic semiconductor is known to possess deficiencies such as low carrier concentrations and lagging change in resistance values for humidity sensing applications [24,25]. From the literature, ZnO was reported to be doped with numerous kinds of elements [26][27][28][29]. For instance, Kim et al reported on the Nanostructured Materials -Fabrication to Applications fabrication of yttrium (Y)-doped ZnO nanorod arrays quantum dot (QD) synthesized solar cell using the chemical bath deposition method [30].…”

Section: Metal-doped Znomentioning

confidence: 99%

Aluminum- and Iron-Doped Zinc Oxide Nanorod Arrays for Humidity Sensor Applications

Ismail¹,

Mamat²,

Mahmood³

2017

Nanostructured Materials - Fabrication to Applications

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Metal-doped zinc oxide (ZnO) nanorod arrays have attracted much attention due to improvement in their electrical, structural, and optical properties upon doping. In this chapter, we discuss the effects of aluminum (Al)-and iron (Fe)-doping on ZnO nanorod arrays properties particularly for humidity sensor applications. Compared to Fe, Al shows more promising characteristics as doping element for ZnO nanorod arrays. The Al-doped ZnO nanorod arrays showed dense arrays, small nanorods diameter, and high porous surface. The I-V characteristics showed that Al-doped sample possesses higher conductivity. From the humidity sensing performance of the samples, Al-doped ZnO nanorod arrays possess the superior sensitivity, more than two times higher than that of the undoped ZnO nanorod arrays sample, demonstrating great potential of Al-doped ZnO nanorod arrays in humidity sensor applications.

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“…Hence, developing high visible-light-driven ZnO and enhancing the separation rate of electron-hole pairs are the main goals to improve the photocatylytic efficiency. To address these issues, a few methods have been proposed such as semiconductor combination [17][18][19], non-metal doping [20][21][22][23], transition and noble metal doping [24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Novel ZnO-Ag/MWCNT nanocomposite for the photocatalytic degradation of phenol

Hosseini

Kasaeian

Pourfayaz

et al. 2018

Materials Science in Semiconductor Processing

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A novel Ag-doped ZnO nanoparticle with different amounts of multi-walled carbon nanotubes (MWCNT) was developed in this work, aiming to shift the band edge toward longer wavelength, and provide more effective separation of electron/hole pairs. New particles were produced in a simple sol-gel method and assessed toward phenol degradation under UVA illumination. The photocatalysts were characterized by the X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) with an energy-dispersive X-ray (EDX) spectroscopy analysis, transition electron microscopy (TEM), BET surface area analyzer, UV-vis diffuse reflectance spectroscopy (DRS), and photoluminescence spectroscopy (PL). The results indicated that all the samples containing MWCNTs exhibited higher photocatalytic activity than bare ZnO and Ag-doped ZnO nanoparticles. At a 10% MWCNT addition, the novel particle achieved a photocatalytic conversion rate of 81% in removing 100 ppm phenol under UVA light after 240 min. The pH value, initial concentration and catalyst dosage were found to influence the particle's photocatalytic performance significantly, and the kinetics of phenol degradation followed the pseudo-firstorder equation. The new particle could be utilized as a promising cost effective and environmentally friendly material for the degradation of organic pollutants.

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Cu doped ZnO microballs as effective sunlight driven photocatalyst

Cited by 48 publications

References 33 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

Aluminum- and Iron-Doped Zinc Oxide Nanorod Arrays for Humidity Sensor Applications

Novel ZnO-Ag/MWCNT nanocomposite for the photocatalytic degradation of phenol

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