Ternary reduced graphene oxide–CuO/ZnO nanocomposite as a recyclable catalyst with enhanced reducing capability

Tantubay, Kartik; Das, Piu; Baskey, Moni

doi:10.1016/j.jece.2020.103818

Cited by 24 publications

(9 citation statements)

References 40 publications

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“…On the other hand, for ZnO/CuO NCs samples other than the hexagonal ZnO peaks, some additional diffraction peaks were observed at 2θ values of ≈35.6, 38.9, 48.9, 53.7, 58.4, 61.6, and 66.4°, which are associated with the (11−1), ( 111), (20−2), (020), ( 202), (11−3), and (31−1) crystalline planes of the monoclinic CuO (JCPDS, 48−1548), respectively. 60 As observed from the diffractograms of NCs, with increasing concentrations of Cu (10−50%), the diffraction peak intensities of CuO gradually increase but conversely decrease in the peak intensities of ZnO. The XRD patterns of the synthesized NCs clearly revealed the presence of ZnO and CuO without any impurities.…”

Section: Xrd Analysismentioning

confidence: 76%

“…For both W–ZnO and ZnO(ext) samples, strong diffraction peaks at 31.8° (100), 34.4°(002), 36.3°(101), 47.6°(102), 56.6°(110), 62.9°(103), 66.4°(200), 67.9°(112), and 69.1° (201) revealed the hexagonal structure of ZnO (JCPDS, 36–1451), and no other peaks related to impurities were observed. On the other hand, for ZnO/CuO NCs samples other than the hexagonal ZnO peaks, some additional diffraction peaks were observed at 2θ values of ≈35.6, 38.9, 48.9, 53.7, 58.4, 61.6, and 66.4°, which are associated with the (11–1), (111), (20–2), (020), (202), (11–3), and (31–1) crystalline planes of the monoclinic CuO (JCPDS, 48–1548), respectively . As observed from the diffractograms of NCs, with increasing concentrations of Cu (10–50%), the diffraction peak intensities of CuO gradually increase but conversely decrease in the peak intensities of ZnO.…”

Section: Resultsmentioning

confidence: 99%

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Croton macrostachyus Leaf Extract-Mediated Green Synthesis of ZnO Nanoparticles and ZnO/CuO Nanocomposites for the Enhanced Photodegradation of Methylene Blue Dye with the COMSOL Simulation Model

Endeshaw,

Tufa,

Goddati

et al. 2023

ACS Omega

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The photodegradation of organic pollutants using metal oxidebased catalysts has drawn great attention as an effective method for wastewater treatment. In this study, zinc oxide nanoparticles (ZnO NPs) and zinc oxide/ copper oxide nanocomposites (ZnO/CuO NCs) were fabricated using the leaf extract of Croton macrostachyus as a nontoxic, natural reducing and stabilizing agent. The synthesized samples were characterized by employing X-ray diffraction, microscopic, spectroscopic, and electrochemical methods. The results confirmed the successful synthesis of ZnO NPs and ZnO/CuO NCs with well-defined crystalline structures and morphologies. The prepared samples were tested for the photodegradation of methylene blue (MB) dye under visible light irradiation. Compared to ZnO NPs, ZnO/CuO NCs showed greatly improved photocatalytic performances, particularly with the sample prepared with the 20 mol % Cu precursor (97.02%). The enhancement could be related to the formed p−n heterojunction, which can suppress the recombination of charge carriers and extend the photoresponsive range. A theoretical study of the photocatalytic activity of ZnO/CuO NCs against MB dye degradation was also conducted by using COMSOL Multiphysics software. The results of the simulation are in reasonable agreement with those of the experiment. This study contributes to the development of sustainable and effective photocatalytic materials that are suitable for application in environmental remediation, particularly in the treatment of wastewater.

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Section: Xrd Analysismentioning

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Croton macrostachyus Leaf Extract-Mediated Green Synthesis of ZnO Nanoparticles and ZnO/CuO Nanocomposites for the Enhanced Photodegradation of Methylene Blue Dye with the COMSOL Simulation Model

Endeshaw,

Tufa,

Goddati

et al. 2023

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Among the various chemical methods, the construction of nanomaterials with ability to reduce or remove Cr(VI) toxicity from aqueous solution has become a challenging issue to the researchers. To date, a variety of strategies have been made to synthesize different nanomaterials for removing toxic ions from aqueous solutions, such as forming smaller nanomaterials [16,17], combining of nanomaterials with carbon-based nanostructures [18,19] and synthesizing hybrid nanocomposites [20,21]. But semiconductor-based photocatalysts, including the design of photocatalysts with increasing surface area [22][23][24][25] are a challenging issue in scientific research era.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Exploration of photoreduction ability of reduced graphene oxide–cadmium sulphide hetero-nanostructures and their intensified activities against harmful microbes

et al. 2021

Self Cite

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Fabrication of effective photocatalyst using semiconductors and graphene or reduced graphene oxide has been regarded as one of the most promising task to attenuate the environmental pollution. This paper reports the synthesis of different nanocomposites of reduced graphene oxide-cadmium sulfide (RGO-CdS) with varying weight ratio of RGO by simple reflux condensation reaction, during which the reduction of graphene oxide (GO) and formation of CdS nanoparticles occur simultaneously. The combination of CdS nanoparticles (NPs) with the optimum amount of RGO gives a noticeable effect on the properties of the synthesized hybrid nanocomposites, such as enhanced optical, photocatalytic properties. The microscopic studies proved that with the increasing RGO content in the nanocomposites, the particle size decreases and got different shapes. These nanocomposites have been investigated separately as nanocatalyst for the reduction of Cr(VI) to Cr(III) in the presence of visible light irradiation and the catalytic activity depends on the pH of the medium and also the particle size of the CdS NPs which are supported by the band gap energy derived from Tauc's equation. The significant increase in photocatalytic performance of the RGO-CdS nanocomposite was attributed to high electron conductivity of the CdS NPs and RGO surface which facilitates charge separation and prolongs the lifetime of photogenerated electron-hole pairs by decreasing the recombination rate. Antibacterial and antiprotozoal activities have been investigated to determine the efficiency of these RGO-CdS nanocomposites on different bacterial and protozoan strains.

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“…CuO is a p-type metal oxide with good characteristics like no toxicity, availability, and a smaller band gap (1.3-2.4 eV). The combination of CuO and other metal oxides will produce unique p-n hybrid materials which show the quality of high-efficiency photocatalytic materials [20]. In this study, nano-oxide CuO with low cost and abundant sources was selected as the catalytic material, the preparation method was simple, and the cost was low.…”

Section: Introductionmentioning

confidence: 99%

Wireless Volatile Organic Compound Detection for Restricted Internet of Things Environments Based on Cataluminescence Sensors

et al. 2022

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Cataluminescence-based sensors do not require external light sources and complex circuitry, which enables them to avoid light scattering with high sensitivity, selectivity, and widely linear range. In this study, a wireless sensor system based on hierarchical CuO microspheres assembled from nano-sheets was constructed for Volatile Organic Compound (VOC) online detection. Through sensor characteristics and data process analysis, the results showed that the luminous sensor system has good luminous characteristics, including the intensity of visible light, high signal/noise (S/N) values, and very short response and recovery times. Different VOC concentration values can be detected on multiple wavelength channels and different Cataluminescence signal spectra separations can process multiple sets of Cataluminescence data combinations concurrently. This study also briefly studied the mechanism action of the Cataluminescence sensor, which can specifically be used for VOC detecting.

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Ternary reduced graphene oxide–CuO/ZnO nanocomposite as a recyclable catalyst with enhanced reducing capability

Cited by 24 publications

References 40 publications

Croton macrostachyus Leaf Extract-Mediated Green Synthesis of ZnO Nanoparticles and ZnO/CuO Nanocomposites for the Enhanced Photodegradation of Methylene Blue Dye with the COMSOL Simulation Model

Croton macrostachyus Leaf Extract-Mediated Green Synthesis of ZnO Nanoparticles and ZnO/CuO Nanocomposites for the Enhanced Photodegradation of Methylene Blue Dye with the COMSOL Simulation Model

Exploration of photoreduction ability of reduced graphene oxide–cadmium sulphide hetero-nanostructures and their intensified activities against harmful microbes

Wireless Volatile Organic Compound Detection for Restricted Internet of Things Environments Based on Cataluminescence Sensors

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