Effect of Co-catalyst (CuO, CoO or NiO) on Bi2O3–TiO2 Structures and Its Impact on the Photocatalytic Reduction of 4-nitrophenol

Guerrero-Araque, Diana; Ramírez-Ortega, David; Calderón, Héctor A.; Sániger, José M.; Gómez, R.

doi:10.1007/s11244-020-01335-7

Cited by 15 publications

(4 citation statements)

References 51 publications

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“…In addition, a positive shift of the flatband potential for Ni/Urea-CN is mainly due to the Ni cocatalyst which may alter the equilibrium of the Fermi level position. This creates a band bending structure at the Ni and Urea-CN junction [47].…”

Section: Resultsmentioning

confidence: 99%

Improved carrier dynamics in nickel/urea-functionalized carbon nitride for ethanol photoreforming

Gunawan

Toe

Sun

et al. 2022

Photochem Photobiol Sci

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Photoreforming has been shown to accelerate the H2 evolution rate compared to water splitting due to thermodynamically favorable organic oxidation. In addition, the potential to simultaneously produce solar fuel and value-added chemicals is a significant benefit of photoreforming. To achieve an efficient and economically viable photoreforming process, the selection and design of an appropriate photocatalyst is essential. Carbon nitride is promising as a metal-free photocatalyst with visible light activity, high stability, and low fabrication cost. However, it typically exhibits poor photogenerated charge carrier dynamics, thereby resulting in low photocatalytic performance. Herein, we demonstrate improved carrier dynamics in urea-functionalized carbon nitride with in situ photodeposited Ni cocatalyst (Ni/Urea-CN) for ethanol photoreforming. In the presence of 1 mM Ni2+ precursor, an H2 evolution rate of 760.5 µmol h−1 g−1 and an acetaldehyde production rate of 888.2 µmol h−1 g−1 were obtained for Ni/Urea-CN. The enhanced activity is ascribed to the significantly improved carrier dynamics in Urea-CN. The ability of oxygen moieties in the urea group to attract electrons and to increase the hole mobility via a positive shift in the valence band promotes an improvement in the overall carrier dynamics. In addition, high crystallinity and specific surface area of the Urea-CN contributed to accelerating charge separation and transfer. As a result, the electrons were efficiently transferred from Urea-CN to the Ni cocatalyst for H2 evolution while the holes were consumed during ethanol oxidation. The work demonstrates a means by which carrier dynamics can be tuned by engineering carbon nitride via edge functionalization. Graphical abstract

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Section: Resultsmentioning

confidence: 99%

Improved carrier dynamics in nickel/urea-functionalized carbon nitride for ethanol photoreforming

Gunawan

Toe

Sun

et al. 2022

Photochem Photobiol Sci

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“…Eg). The positions of the conduction band and valance bands of TiO 2 (P-25) were calculated as -0.1 and 3.1 V (vs. RHE), respectively [62]. Also, the donor density (N d ) of the CuO-VO 2 /TiO 2 was estimated 8.197 9 10 20 cm -3 using Eq.…”

Section: Sample Namementioning

confidence: 99%

Photocatalytic degradation and mineralization of dye pollutants from wastewater under visible light using synthetic CuO-VO2/TiO2 nanotubes/nanosheets

Shammi

Kianfar

Momeni

2021

J Mater Sci: Mater Electron

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CuO-VO 2 /TiO 2 as a new nanocomposite was synthesized through hydrothermal method and identified by various spectroscopic techniques including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), energy dispersive X-ray analysis (EDX), UV-visible, differential reflectance spectroscopy (DRS), and Mott-Schottky. The presence of nanotubes/nanosheets in the synthesized nanocomposite was confirmed by HR-TEM. The anatase and rutile crystalline forms of TiO 2 were detected by Raman spectroscopy and X-ray diffraction (XRD). XPS analysis confirmed the presence of CuO and VO 2 in the nanocomposite. The surface area and the band-gap energy of the nanocomposite were determined via N 2 adsorption-desorption analysis and DRS. The presence of a p-n junction between TiO 2 (n-type) and CuO/VO 2 (p-type) was confirmed by the Mott-Schottky analysis. The photocatalytic activity of the nanocomposite against methylene blue (MB), methyl orange (MO), and cango red (CR) was studied under visible-light irradiation. The times of degradation for the decomposition of the dyes were 10-25 min. The rate constants of degradation for MB, MO, and CR were calculated as 0.34, 0.090, and 0.155 min -1 , respectively. The catalyst was recovered four times. In addition, the mineralization of the dyes was investigated by chemical oxygen demand (COD). The reaction was performed in the presence of different radical scavengers, and the ÁOH was found to be the predominantly active species in the photodegradation of the dyes.

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“…As a p-type semiconductor, CuO has excellent electrical properties. Not only can it be used as a catalyst in the fields of CH 4 combustion [35], NO reduction [36], and photocatalysis [37], but it is also a good adsorption material. Ahmed et al [38] used density functional theory to study the adsorption and dissociation of water on the CuO (111) surface.…”

Section: Introductionmentioning

confidence: 99%

First-principles study on CO oxidation on CuO(111) surface prefers the Eley−Rideal or Langmuir−Hinshelwood pathway

Lin¹,

Shi²,

Yao³

et al. 2022

Nanotechnology

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Using the first-principles approach, we investigated the electronic and chemical properties of cupric oxide CuO (110) and CuO (111) and substantiated their catalytic activity toward CO oxidation. It is found that CuO (111) surface is more stable than the CuO (110) surfacce. We firstly study that adsorption of CO and O2on perfect, oxygen vacancies and Cu-anchored CuO (111) surface. It is found that adsorption of CO and O2 molecules are chemical. Then we selected the most stable adsorption structure of CO/O2 to investigated the CO oxidation mechanism on different surface, here we choose to study the Langmuir-Hinshelwood (LH) mechanism andEley-Rideal(ER) mechanism. The results show that perfect and Ovacancy CuO (111) surface is more inclined to LH mechanism, while the Cu-anchored CuO (111) surface is more inclined to ER mechanism. The results show that CuO catalyst is very effective for CO oxidation. We sincerely hope that our work can contribute to catalytic oxidation.

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Effect of Co-catalyst (CuO, CoO or NiO) on Bi2O3–TiO2 Structures and Its Impact on the Photocatalytic Reduction of 4-nitrophenol

Cited by 15 publications

References 51 publications

Improved carrier dynamics in nickel/urea-functionalized carbon nitride for ethanol photoreforming

Improved carrier dynamics in nickel/urea-functionalized carbon nitride for ethanol photoreforming

Photocatalytic degradation and mineralization of dye pollutants from wastewater under visible light using synthetic CuO-VO2/TiO2 nanotubes/nanosheets

First-principles study on CO oxidation on CuO(111) surface prefers the Eley−Rideal or Langmuir−Hinshelwood pathway

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