Boosted natural sunlight driven photodegradation of organic dyes using rGO anchored Pr/Cu dual-doped ZnO nanocomposite: Characterization and mechanistic insight

Fatima, Saman; Munawar, Tauseef; Nadeem, Muhammad; Mukhtar, Faisal; Khan, Shoukat Alim; Koç, Muammer; Iqbal, Faisal

doi:10.1016/j.optmat.2022.113397

Cited by 32 publications

(4 citation statements)

References 95 publications

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“…Moreover, the decreased diffraction peak intensity and shifting of reflection planes in the TiC@MnSe nanocomposite may be due to the difference in ionic radii of MnSe and TiC nanoparticles. The peaking shifting causes lattice expansion and increases the crystallite size of the particle, which is executed through the Debye–Scherrer equation. , Furthermore, lattice parameters, volume, lattice strain, and dislocation density of synthesized electrodes were also calculated via classical equations, as mentioned in the previous report and listed in Table . The lattice parameters ( a , b , c ), volume, and average crystalline size of cubic TiC and MnSe in the heterostructure TiC@MnSe nanocomposite are increased as compared to pristine TiC and MnSe, while lattice strain and dislocation density of TiC and MnSe are decreased in the hybrid TiC@MnSe nanocomposite as compared to individual TiC and MnSe.…”

Section: Resultsmentioning

confidence: 99%

Investigation of Active Spots on a TiC@MnSe Nanocomposite: An Efficient Electrocatalyst for the Oxygen Evolution Reaction

Munawar,

Fatima,

Alam

et al. 2024

Energy Fuels

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Electrocatalysts with outstanding electrochemical performance and ecofriendly nature are desired for water-splitting studies to develop substantial hydrogen energy resources. In this report, a titanium carbide (TiC), MnSe, and novel TiC@MnSe heterostructure nanocomposite has been prepared by a facile hydrothermal process and analyzed using physical and electrochemical tools for electrocatalytic water splitting via the oxygen evolution reaction (OER). The heterostructure TiC@MnSe catalyst possesses a reduced overpotential of 299 mV at a universal standard current density of 10 mA/cm 2 , a small Tafel slope of 48.4 mV/dec, a large C dl 54 mF, an enhanced electrochemical functional surface area of 1350 cm 2 , a low charge transfer resistance of 1.13 Ω, and robust stability after 70 h constant vigorous OER activity in an alkaline medium. The fabricated catalyst exhibits an encapsulated heterostructure morphology that supplies the active channels for the OER and remarkably boosts the electrochemical activity of the proposed catalyst for electrochemical water splitting (EWS). This work presents the superb electrochemical activity of the metal chalcogenide-based composite TiC@MnSe and addresses the fundamental reason for its robust performance. The research outcome pushes for largescale electrochemical commercial applications, and the proposed TiC@MnSe can act as a cutting edge against costly noble metalbased electrocatalysts.

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Section: Resultsmentioning

confidence: 99%

Investigation of Active Spots on a TiC@MnSe Nanocomposite: An Efficient Electrocatalyst for the Oxygen Evolution Reaction

Munawar,

Fatima,

Alam

et al. 2024

Energy Fuels

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“…Apart from these factors, the recombination rate of photogenerated charges can impact the photocatalytic process. This is where dopant and co-dopant come in as alternatives to introduce structural modifications and create defects in the crystal lattice of materials to increase the formation of active species and delay the recombination of electron/hole pairs [ 17 , 21 , 98 , 99 , 100 , 101 ]. Table 3 presents a comparison of the photocatalytic efficiency of doped ZnO-based semiconductors used in photocatalytic studies of dyes and drugs, drawing on previous research studies.…”

Section: Resultsmentioning

confidence: 99%

Green Synthesis of Er-Doped ZnO Nanoparticles: An Investigation on the Methylene Blue, Eosin, and Ibuprofen Removal by Photodegradation

Silva,

Castro-Lopes,

Jerônimo

et al. 2024

Molecules

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We present a study on the green synthesis of undoped and Er-doped ZnO compounds using Mangifera indica gum (MI). A set of tests were conducted to assess the structure of the material. The tests included X-ray diffraction, Raman, and Fourier-transform infrared spectroscopy. Optical properties were studied using diffuse reflectance and photoluminescence. Morphological and textural investigations were done using SEM images and N2 adsorption/desorption. Furthermore, photocatalytic tests were performed with methylene blue (MB), yellow eosin (EY), and the pharmaceutical drug ibuprofen (IBU) under UV irradiation. The study demonstrated that replacing the stabilizing agent with Mangifera indica gum is an effective method for obtaining ZnO nanoparticles. Additionally, the energy gap of the nanoparticles exhibits a slight reduction in value. Photoluminescence studies showed the presence of zinc vacancies and other defects in both samples. In the photocatalytic test, the sample containing Er3+ exhibited a degradation of 99.7% for methylene blue, 81.2% for yellow eosin, and 52.3% for ibuprofen over 120 min. In the presence of methyl alcohol, the degradation of MB and EY dyes is 16.7% and 55.7%, respectively. This suggests that hydroxyl radicals are responsible for the direct degradation of both dyes. In addition, after the second reuse, the degradation rate for MB was 94.08%, and for EY, it was 82.35%. For the third reuse, the degradation rate for MB was 97.15%, and for EY, it was 17%. These results indicate the significant potential of the new semiconductor in environmental remediation applications from an ecological synthesis.

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“…e − (CB) + O2 → • O2 − (9) The photocatalytic activity of a semiconductor is directly influenced by the concentration of charges on its surface as well as surface defects, which can affect the charge recombination frequency [12,38,41]. The introduction of Ni cations dopant can create structural defects that act as intermediates for electron energy levels and electron acceptors.…”

Section: Mb Initial Concentrationmentioning

confidence: 99%

“…When it comes to photocatalytic activity, doping the ZnO lattice is crucial for trapping charge carriers from holes and photogenerated electrons in the valence and conduction bands, respectively. This makes recombination difficult, thus ensuring efficient performance [36][37][38]. This allows the species to remain available for longer redox reactions at the surface of the material.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Ni-Doped ZnO Nanoparticles Using Cashew Gum: Investigation of the Structural, Optical, and Photocatalytic Properties

Lins,

Jerônimo,

Barbosa

et al. 2023

Molecules

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This work adopted a green synthesis route using cashew tree gum as a mediating agent to obtain Ni-doped ZnO nanoparticles through the sol–gel method. Structural analysis confirmed the formation of the hexagonal wurtzite phase and distortions in the crystal lattice due to the inclusion of Ni cations, which increased the average crystallite size from 61.9 nm to 81.6 nm. These distortions resulted in the growth of point defects in the structure, which influenced the samples’ optical properties, causing slight reductions in the band gaps and significant increases in the Urbach energy. The fitting of the photoluminescence spectra confirmed an increase in the concentration of zinc vacancy defects (VZn) and monovacancies (Vo) as Zn cations were replaced by Ni cations in the ZnO structure. The percentage of VZn defects for the pure compound was 11%, increasing to 40% and 47% for the samples doped with 1% and 3% of Ni cations, respectively. In contrast, the highest percentage of VO defects is recorded for the material with the lowest Ni ions concentration, comprising about 60%. The influence of dopant concentration was also reflected in the photocatalytic performance. Among the samples tested, the Zn0.99Ni0.01O compound presented the best result in MB degradation, reaching an efficiency of 98.4%. Thus, the recovered material underwent reuse tests, revealing an efficiency of 98.2% in dye degradation, confirming the stability of the photocatalyst. Furthermore, the use of different inhibitors indicated that •OH radicals are the main ones involved in removing the pollutant. This work is valuable because it presents an ecological synthesis using cashew gum, a natural polysaccharide that has been little explored in the literature.

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Boosted natural sunlight driven photodegradation of organic dyes using rGO anchored Pr/Cu dual-doped ZnO nanocomposite: Characterization and mechanistic insight

Cited by 32 publications

References 95 publications

Investigation of Active Spots on a TiC@MnSe Nanocomposite: An Efficient Electrocatalyst for the Oxygen Evolution Reaction

Investigation of Active Spots on a TiC@MnSe Nanocomposite: An Efficient Electrocatalyst for the Oxygen Evolution Reaction

Green Synthesis of Er-Doped ZnO Nanoparticles: An Investigation on the Methylene Blue, Eosin, and Ibuprofen Removal by Photodegradation

Facile Synthesis of Ni-Doped ZnO Nanoparticles Using Cashew Gum: Investigation of the Structural, Optical, and Photocatalytic Properties

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