Structural, optical, and luminescence properties of Ni2+-doped ZnO–CdS nanocomposite: synthesis and investigations for green light emission

Gurugubelli, Thirumala Rao; Ravikumar, R.V.S.S.N.; Koutavarapu, Ravindranadh

doi:10.1007/s11696-021-01888-1

Cited by 10 publications

(5 citation statements)

References 53 publications

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“…All the diffraction planes are ascribed to the hexagonal phase of Al 2 O 3 , which is well matched with the JCPDS data of 71–1123. Crystallite sizes of Al 2 O 3 nanoparticles has been calculated using Scherrer's equation for the (1 0 4) lattice plane 31 . The typical crystallite size was determined to be 6.786 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Repetition of the process is required at 180, 220, and 240 bar fuel injection pressures. 31 The typical crystallite size was determined to be 6.786 nm. 7, BTE of fuel samples exhibited a similar tendency to diesel in that as FIP increased, diesel and B20 at standard FIP at full load is 31.91 and 31.3% but at higher FIP of 240 bar, diesel and B20 showed 31.71 and 31.11% respectively.…”

Section: Methodsmentioning

confidence: 99%

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Effect of changing injection pressure on mahua oil‐based biodiesel combustion with blended Al₂O₃ nanoparticles on CI engine performance and emission parameters

Simhadri

Rao

Paswan

2022

Env Prog and Sustain Energy

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Alternative fuels have drawn a lot of interest as oil and gas sources have depleted and environmental concerns have grown. An alternative fuel being researched as a potential replacement for fossil fuels is biodiesel. A 5.2 KW, 4-stroke, single-cylinder diesel engine's Performance, combustion, and emission characteristics were evaluated in this study at 1500 rpm with various fuel injection pressures (180, 200, 220, and 240 bar). B20 (80 percent diesel and 20 percent mahua biodiesel) was created by blending mahua oil-based biodiesel with plain diesel at a 20/80 ratio. Al 2 O 3 nanoparticles were then added at four different quantities, including 25, 50, 75, and 100 ppm. It is found that BTE was improved by 6.1% and BSFC was reduced by 2.5% for B20A25over diesel at the FIP of 220 bar. In-cylinder pressure was higher and HRR was raised by 7.2% for B20A25compared to diesel at 180 bar. CO emission was reduced by 39% in B20A25 when compared to biodiesel blend at 180 bar. When compared to diesel at 180 bar, B20A25's HC and CO2 emissions were reduced by 7.5% and 4.5%, respectively. Smoke for B20A25 at 240 bar was 3.6 percent lower than diesel. Maximum NOx emissions reduction was seen when Al 2 O 3 nanoparticles were added to the blend at 220 bar FIP.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effect of changing injection pressure on mahua oil‐based biodiesel combustion with blended Al₂O₃ nanoparticles on CI engine performance and emission parameters

Simhadri

Rao

Paswan

2022

Env Prog and Sustain Energy

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“…The XRD investigation suggested that the doping elements Cobalt may have been properly substituted into Zn-S lattice, as there were no secondary or impurity phases identified. The peak positions of the Cobalt doped samples significantly shift upward in the 2θ values indicates that Co 2+ (0.58 Å) has a smaller ionic radius compared to that of Zn 2+ (0.74 Å) in the ZnS [42][43][44]. Due to the ionic radius of Cobalt being slightly smaller (0.58 Å) than that of Zn, the peak positions of samples that contain Cobalt exhibit a little shift towards lower 2θ values.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 96%

Improved Photocatalytic Performance of Cobalt Doped ZnS Decorated with Graphene Nanostructures under UV-visible Light: Towards Efficient H2 Production

Kiptarus,

Korir,

Githinji

et al. 2023

Preprint

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Highly dispersed Cobalt doped ZnS nanostructures were successfully fabricated on the surfaces of graphene sheets via a simple hydrothermal method. X-ray diffraction (XRD), X-ray photocurrent spectroscopy (XPS), Raman spectroscopy (RS), Fourier transform infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM) were utilized to analyze the structural characteristics of the Cobalt doped ZnS decorated with graphene CoxZn1−xSrGO Nanostructures (NSs). UV-visible optical absorption (UV-vis) studies were conducted to investigate their optical properties. In laboratory studies utilizing water and visible light, the photocatalytic activity of CoxZn1−xS rGO NSs at (x = 0, 1, 2, 4 and 6 atm.%) were evaluated. Graphite Oxide (GO) was successfully transformed in to sheets of graphene, according to the findings of XRD and FTIR analysis. SEM investigation showed graphene sheets enhanced with ZnS NSs possessed paper like appearance. UV-vis confirmed a noticeable rapid increase in transmittance along the UV wavelength area and confirmed a highly transparent NSs in the wavelength range of (180-800 nm). Transmittance spectra revealed a direct allowable band gap range of (1.26-5.46 eV), demonstrating band gap decrease as cobalt content increased. The Co0.04Zn0.96S rGO NSs sample had the highest photocatalytic activity, measured at 7649 μmolh−1g−1. A combination of improved dispersion properties, greater surface area, increased absorption and enhanced transfer of photogenerated electrons, CoxZn1−xS rGO NSs increased the photocatalytic hydrogen H2 generation activity.

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“…However, the ZnO-CdS NCs displayed three emission bands at 381, 425, and 468 nm and a broad emission centered at 526 nm. The weaker intensity of ZnO-CdS NCs at 381 nm indicated that the deposited CdS NPs reduces the recombination of photoinduced e − /h + pairs and promoted the interface charge transfer [20]. The peak at 425 is ascribed to the Zn vacancies (V Zn ) [21].…”

Section: Photoluminescence Studymentioning

confidence: 99%

Enhanced Photocatalytic Activity of ZnO–CdS Composite Nanostructures towards the Degradation of Rhodamine B under Solar Light

Gurugubelli¹,

Ravikumar

Koutavarapu

2022

Catalysts

Self Cite

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A simple chemical precipitation route was utilized for the synthesis of ZnO nanoparticles (NPs), CdS NPs and ZnO–CdS nanocomposites (NCs). The synthesized nanostructures were examined for the crystal structure, morphology, optical properties and photodegradation activity of rhodamine B (RhB) dye. The ZnO–CdS NCs showed a mixed phase of hexagonal wurtzite structure for both ZnO NPs and CdS NPs. Pure ZnO NPs and CdS NPs possessed bandgaps of 3.2617 and 2.5261 eV, respectively. On the other hand, the composite nanostructures displayed a more narrow bandgap of 2.9796 eV than pure ZnO NPs. When compared to bare ZnO NPs, the PL intensity of near-band-edge emission at 381 nm was practically suppressed, suggesting a lower rate of photogenerated electron–hole (e−/h+) pairs recombination, resulting in enhanced photocatalytic activity. Under solar light, the composite nanostructures displayed a photodegradation efficiency of 98.16% towards of RhB dye. After four trials, the structural stability of ZnO–CdS NCs was verified.

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Structural, optical, and luminescence properties of Ni2+-doped ZnO–CdS nanocomposite: synthesis and investigations for green light emission

Cited by 10 publications

References 53 publications

Effect of changing injection pressure on mahua oil‐based biodiesel combustion with blended Al₂O₃ nanoparticles on CI engine performance and emission parameters

Effect of changing injection pressure on mahua oil‐based biodiesel combustion with blended Al₂O₃ nanoparticles on CI engine performance and emission parameters

Improved Photocatalytic Performance of Cobalt Doped ZnS Decorated with Graphene Nanostructures under UV-visible Light: Towards Efficient H2 Production

Enhanced Photocatalytic Activity of ZnO–CdS Composite Nanostructures towards the Degradation of Rhodamine B under Solar Light

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Structural, optical, and luminescence properties of Ni2+-doped ZnO–CdS nanocomposite: synthesis and investigations for green light emission

Cited by 10 publications

References 53 publications

Effect of changing injection pressure on mahua oil‐based biodiesel combustion with blended Al2O3 nanoparticles on CI engine performance and emission parameters

Effect of changing injection pressure on mahua oil‐based biodiesel combustion with blended Al2O3 nanoparticles on CI engine performance and emission parameters

Improved Photocatalytic Performance of Cobalt Doped ZnS Decorated with Graphene Nanostructures under UV-visible Light: Towards Efficient H2 Production

Enhanced Photocatalytic Activity of ZnO–CdS Composite Nanostructures towards the Degradation of Rhodamine B under Solar Light

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Resources

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Effect of changing injection pressure on mahua oil‐based biodiesel combustion with blended Al₂O₃ nanoparticles on CI engine performance and emission parameters

Effect of changing injection pressure on mahua oil‐based biodiesel combustion with blended Al₂O₃ nanoparticles on CI engine performance and emission parameters