The novel two step synthesis of CuO/ZnO and CuO/CdO nanocatalysts for enhancement of catalytic activity

Sankaran, A.; Kumaraguru, K.

doi:10.1016/j.molstruc.2020.128772

Cited by 28 publications

(3 citation statements)

References 33 publications

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“…(αhν) 2 vs. energy plots are presented in Fig. 4, and band gap energies are estimated by extrapolating the linear part of the graphs to the energy axis [55][56][57][58][59]. These values are significantly higher than the bulk CuO (1.2 eV) and similar kind of results are also reported in the literature [17,19,20,26,27,31].…”

Section: Uv-visible Spectroscopysupporting

confidence: 75%

Experimental and DFT + U Investigations of the Cu1-xCdxO Nanoparticles Synthesized for Photocatalytic Degradation of Organic Pollutants: Environmental Application

Singh,

Batoo

et al. 2024

Water Air Soil Pollut

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The present investigation focuses on the impact of Cd-doping concentration on the structural, optical and photocatalytic degradation properties of the CuO nanostructures. Cddoped (0, 1 and 3 mol %) CuO nanostructures were synthesized using ball milling cum solidstate reaction method. The physical properties of nanostructures were investigated using Raman, TEM, ultraviolet-visible, photoluminescence spectroscopy, X-ray diffraction, and dynamic light scattering techniques. X-ray diffraction and Raman spectroscopy detect the presence of a monoclinic CuO phase only, which confirms the successful doping of Cd in the CuO matrix. A decrease in particle size with doping has been disclosed by XRD, dynamic light scattering and 2 TEM studies. XRD and PL studies reveal the enhancement in structural defects with doping concentration. Further, the DFT+U approach was used for crystal structure, the density of states and band structure evaluation. The sunlight-driven photocatalytic degradation activity of the samples was tested against organic pollutants (methylene orange (MO) and methylene blue (MB) dyes). The degradation efficiency of the CuO nanoparticles was found to the enhanced with Cddoping concentration. 3 mol% doped Cd-CuO, shows the best degradation efficiency and successfully degrades 59% and 75% of MO and MB dyes in 240 min under sunlight irradiation.Our samples exhibit a pseudo-first-order kinetic model and the rate constant is found to increase with Cd-doping. Thus, Cd-doped CuO nanostructures possess good candidature for environmental applications.

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Section: Uv-visible Spectroscopysupporting

confidence: 75%

Experimental and DFT + U Investigations of the Cu1-xCdxO Nanoparticles Synthesized for Photocatalytic Degradation of Organic Pollutants: Environmental Application

Singh,

Batoo

et al. 2024

Water Air Soil Pollut

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“…The average crystallite size of the MMT/Fe 3 O 4 /Ag nanocomposite was calculated by following Debye-Scherrer's formula given by Eq. (1) where, D is crystallite size and K is Debye-Scherrer's constant, λ stands for X-ray wavelength, β indicates the full width at half maximum intensity of the XRD peaks and θ is the difraction angle (Isa et al 2020;Sankaran and Kumaraguru 2020;Shaheen and Ahmad 2020). The average crystal size of MMT/Fe 3 O 4 /Ag calculated using the Debye-Scherrer formula was found to be 15 nm.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of silver doped magnetic-nanoclay montmorillonite/iron oxide/silver nanocomposite for environmental applications throught effective dye degradation

Altun

2021

Preprint

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Magnetic-nanoclay montmorillonite/iron oxide (MMT/Fe 3 O 4 ) nanocomposite was prepared by co-precipitation method and montmorillonite/iron oxide/silver (MMT/Fe 3 O 4 /Ag) nanocomposite was synthesized, called as chemical reduction method, by reduction of silver nitrate (AgNO 3 ) salt with sodium borohydride (NaBH 4 ) as reducing agent. These nanocomposites were characterized by Branuer-Emmet-Teller Surface Area and Porosity Dimension (BET), X-Ray Diffractometer (XRD), Fourier Transform Infrared Spectrum (FTIR), Scanning Electron Microscope (SEM) and Vibrating Sample Magnetometer (VSM). Subsequently, MMT/Fe 3 O 4 /Ag was used in degradation of Rhodamine B (RhB) in the presence of NaBH 4 to evaluate catalytic activity of its and consequences were monitored using UV-Visible Spektrofotometer (UV-Vis). Moreover, various parameters including pH, catalyst dosage, initial dye concentration and amount of NaBH 4 were investigated for optimum reaction conditions. The reduction reactions followed pseudo-first order kinetics and complete degradation of RhB were achieved in 8 minutes using MMT/Fe 3 O 4 /Ag as catalysts while degradation of %46 of RhB were achieved in 60 minutes using MMT/Fe 3 O 4 .

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“…Previous research with a similar focus has predominantly employed various methods, precursors, reaction conditions, and sometimes toxic additives, such as HCl, oxalic acid, and sodium sulfate, as well as different structure-directing agents. However, some methods are not cost-effective and require complex instrumentation [25,26]. Our study introduces a simple and low-cost approach to synthesizing CuO-ZnO composites using a polyol and sol-gel technique.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Gas Sensing Performance of CuO-ZnO Composite Nanostructures for Low-Concentration NO2 Detection

Pakdel,

Borsi,

Ponzoni

et al. 2024

Chemosensors

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The detection of nitrogen dioxide (NO2) is essential for safeguarding human health and addressing environmental sustainability. That is why, in the last decades, gas sensors have been developed to detect NO2 to overcome these hazards. This study explores the use of a novel CuO-ZnO composite synthesized through a polyol and sol–gel technique to enhance gas sensing performance. The CuO-ZnO composite offers the advantage of a synergic combination of its properties, leading to improved sensitivity, selectivity, and low detection limit. The innovative polyol technique employed in this research enables the controlled synthesis of hierarchical CuO and porous ZnO structures. The composite formation is achieved using the sol–gel method, resulting in CuO-ZnO composites with different ratios. The structural, morphological, and optical properties of the materials have been characterized using FESEM, X-ray diffraction, and UV-vis spectroscopy. Gas sensing experiments demonstrate enhanced performance, particularly in sensitivity and selectivity for NO2, even at low concentrations. The composites also exhibit improved baseline stability compared to pristine CuO and ZnO. This study explains the influence of humidity on gas sensing properties by examining interactions between water molecules and sensor surfaces. Notably, the developed CuO-ZnO composite displays excellent selectivity towards NO2, attributed to favorable bonding characteristics and acid-base properties. Overall, this research contributes to advancing gas sensor technology, providing a promising potential for sensitive and selective NO2 detection, thereby addressing critical needs for human health and environmental protection.

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The novel two step synthesis of CuO/ZnO and CuO/CdO nanocatalysts for enhancement of catalytic activity

Cited by 28 publications

References 33 publications

Experimental and DFT + U Investigations of the Cu1-xCdxO Nanoparticles Synthesized for Photocatalytic Degradation of Organic Pollutants: Environmental Application

Experimental and DFT + U Investigations of the Cu1-xCdxO Nanoparticles Synthesized for Photocatalytic Degradation of Organic Pollutants: Environmental Application

Synthesis and characterization of silver doped magnetic-nanoclay montmorillonite/iron oxide/silver nanocomposite for environmental applications throught effective dye degradation

Enhanced Gas Sensing Performance of CuO-ZnO Composite Nanostructures for Low-Concentration NO2 Detection

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