Co3O4/NiO nanocomposite as a thermocatalytic and photocatalytic material for the degradation of malachite green dye

Rehman, Waseeq Ur; Khattak, Muhammad Tayyab Noor; Saeed, Abdu; Shaheen, Kausar; Shah, Zarbad; Hussain, Sayed; Bakhsh, Esraa M.; Alraddadi, Haneen M.; Fagieh, Taghreed M.; Akhtar, Kalsoom; Khan, Sher Bahadar; Khan, Shahid Ali

doi:10.1007/s10854-022-09428-7

Cited by 21 publications

(4 citation statements)

References 54 publications

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“…where hν is the incident energy, A is a constant based on the electronic transition probability, and r describes the optical transition type, with r = 1/2 or 2 for allowed direct and indirect transitions [36,37], respectively. In Figures 6(a) and (b), we can observe the plots for (αhu) 1/2 and (αhu) 2 with respect to the energy of photons (hu) for indirect and direct optical transitions in PVA/coronene composites.…”

Section: Absorption Properties and Energy Gap Calculationsmentioning

confidence: 99%

Enhancement of the structural, optical, and dispersion performance of polyvinyl alcohol via coronene additive for optoelectronic applications

Al-Muntaser,

Alzahrani,

Abo-Dief

et al. 2023

Phys. Scr.

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Composite films made of polyvinyl alcohol (PVA) filled with various coronene concentrations were fabricated via the solution casting method. Several characterization techniques were used to examine the prepared samples. The X-ray diffraction study shows decreasing semi-crystalline properties in PVA/coronene composites with increasing coronene levels, thereby improving charge carrier mobility and enhancing conductivity. The alterations in the chemical functional groups of the PVA/coronene composites were explored using Fourier-transform infrared spectroscopy (FTIR). The impact of coronene molecules on the optical characteristics of PVA was investigated in the spectral ranges of 190-2500 nm. PVA/coronene composite exhibits higher UV blocking in the 190-400 nm wavelength range, suitable for UV notch filters like laser blocking filters. By increasing the coronene filling ratio from 0 wt% to 3 wt%, both the indirect and direct optical band-gap of PVA films decreased from 5.15 eV and 5.75 eV to 3.83 eV and 5.12 eV, respectively. The single oscillator model (Wemple-DiDomenico) was used to explain the refractive index dispersion region. The extracted values of dispersion energy (Ed), oscillator energy (Eo), dielectric constant at infinite frequency (ε∞), and lattice dielectric constant (εL) of PVA/coronene composite samples increased from 0.78 eV, 2.41 eV, 1.32 and 1.41 to 13.44 eV, 12.22 eV 2.10 and 2.13, respectively. These changes in dispersion parameters are due to cross-linking between the PVA polymeric matrix and the coronene. As a result of these improvements, PVA/coronene films could be applied to flexible packaging applications and optoelectronic devices like solar cells or light-emitting diodes.

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Section: Absorption Properties and Energy Gap Calculationsmentioning

confidence: 99%

Enhancement of the structural, optical, and dispersion performance of polyvinyl alcohol via coronene additive for optoelectronic applications

Al-Muntaser,

Alzahrani,

Abo-Dief

et al. 2023

Phys. Scr.

Self Cite

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show abstract

“…Here, E g is the bandgap energy, A is a constant, and r is the Tauc exponent, the r values depend on the electronic transition type. The Tauc plot serves as a tool for extracting information about both the band gap and the specific electronic transition (indirect and/or direct) [37,38]. In an indirect band gap (IBG) materials (r = 2), the valence band (VB) and conduction band (CB) peaks occur at different momentum states (k).…”

Section: Absorption Properties and Energy Gap Calculationsmentioning

confidence: 99%

Tailoring the optical properties of dye–polymer composite films based on polyvinyl alcohol doped with phenol red toward flexible optoelectronic applications

Al-Muntaser,

Althobiti,

Al Naim

et al. 2024

Phys. Scr.

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The composite films of polyvinyl alcohol (PVA) incorporating varying concentrations of phenol red (PR) dye were fabricated using the solution casting method. Structural characteristics of the prepared films were explored through XRD and FTIR spectroscopy analyses. The inclusion of PR dye within the PVA matrix induced cross-linking, enhancing the amorphous nature of the doped PVA samples, as evidenced by XRD patterns. In the presence of PR dopants, the FTIR peaks for PVA exhibited altered intensities and increased width, indicating physical interactions between the functional groups of PVA and PR dopants. The impact of PR additives on the optical properties of PVA was investigated across the spectral range of 190-2500 nm. The PVA/phenol red composite demonstrated enhanced UV blocking in the 190-400 nm wavelength range, rendering it suitable for applications such as UV notch filters, including laser blocking filters. The indirect and direct optical band-gaps of PVA polymer films were reduced from 5.20 eV and 5.78 eV to 4.30 eV and 5.28 eV, respectively, with an increase in the PR filling ratio from 0 wt% to 1.8 wt%. The dispersion region of the refractive index was analyzed using the single oscillator model (Wemple-DiDomenico). Calculation and discussion of values such as dispersion and oscillation energies (Ed and Eo), permittivity at infinite frequency (ε∞), and lattice contribution to the dielectric function (εL) of PVA/PR composite films were conducted. These advancements position PVA/PR composite films for potential applications in flexible optoelectronic devices, including light-emitting diodes and photodetectors.

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“…The photo catalysis results shown that catalyst plays a vital role in the degradation of MG dye under solar light irradiation. 40 This shows cobalt increases the catalytic processand on malachite dye (MG) dye degradation process. The main mechanism involved in this photocatalytic process is oxidation (addition of oxygen and removal of hydrogen) and reduction (addition of hydrogen and removal of oxygen) reaction.…”

Section: Elemental Analysis (Edx)mentioning

confidence: 99%

Nanocomposites of Co-NiS/GO as a Versatile Catalyst: Enabling Platinum-Free DSSC Counter Electrodes and Enhancing Organic Dye Degradation

G.,

Geetha,

Ramesh

2024

ECS J. Solid State Sci. Technol.

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This study presents the synthesis of a nanocomposite intended to serve as a counter electrode in dye-sensitized solar cells (DSSCs), replacing platinum electrodes, as well as functioning as a nanocatalyst for organic dye degradation. Graphene oxide was synthesized using a modified Hummers method, and cobalt-doped nickel sulfide on graphene oxide (Co-NiS/GO) was prepared via hydrothermal synthesis. The samples underwent characterization through various testing methods. X-ray diffraction analysis revealed a hexagonal structure with a crystallite size of 30 nm. Field-emission scanning electron microscopy/energy-dispersive X-ray images showed a cornflake-like structure, with elements such as cobalt, nickel, sulfur, carbon, and oxygen present. Chemical valence states were confirmed through X-ray photoelectron specteroscopy analysis. The power conversion efficiency of the Co-NiS/GO counter electrode in DSSCs was investigated, with parameters such as open-circuit voltage, short-circuit current density, fill factor, and power conversion efficiency calculated to be 8.6032 mV, 0.5484 mA cm−2, 61, and 2.83%, respectively, based on I-V studies. Furthermore, the developed Co-NiS/GO nanocomposite was assessed for its photo catalytic dye degradation capabilities using malachite green (MG), achieving a degradation rate of approximately 96% within 180 min.

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Co3O4/NiO nanocomposite as a thermocatalytic and photocatalytic material for the degradation of malachite green dye

Cited by 21 publications

References 54 publications

Enhancement of the structural, optical, and dispersion performance of polyvinyl alcohol via coronene additive for optoelectronic applications

Enhancement of the structural, optical, and dispersion performance of polyvinyl alcohol via coronene additive for optoelectronic applications

Tailoring the optical properties of dye–polymer composite films based on polyvinyl alcohol doped with phenol red toward flexible optoelectronic applications

Nanocomposites of Co-NiS/GO as a Versatile Catalyst: Enabling Platinum-Free DSSC Counter Electrodes and Enhancing Organic Dye Degradation

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