Electrospun Foamlike NiO/CuO Nanocomposites with Superior Catalytic Activity toward the Reduction of 4-Nitrophenol

Abstract

Foamlike NiO/CuO nanocomposites were prepared using a simple electrospinning technique combined with appropriate calcination. By tuning the Ni/Cu molar ratio (1:2, 1:1, and 2:1) in the initial material, different NiO/CuO nanocomposites were obtained. X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption−desorption isotherms were used to characterize the composites. Furthermore, they were investigated as catalysts for the reduction of 4-nitrophenol (4-NP) in the presence of NaBH 4 . The test results demonstrate that the nanocomposite with Ni/Cu = 1:1 presents the best catalytic activity for its high content of surface oxygen vacancy and specific surface area.

Effect of the organic sulfur source on the photocatalytic activity of CdS

“…The photocatalytic degradation properties of samples were evaluated under visible light irradiation ( λ ≥ 420 nm) with RhB as the target pollutant. The degradation curves of RhB by S-TAA, S-TA, S-TSC and S-NS accord with the first-order-kinetic equation: 34 ln( C 0 / C t ) = kt where t and k are the visible light irradiation time and degradation rate constant, respectively. Compared with CdS prepared by many other methods, S-TAA shows superior photocatalytic degradation performance.…”

“…The crystallite size of the four samples was obtained by Debye–Scherrer's formula, 34 where D is the crystallite size, k is 0.94, λ is the wavelength of the X-ray radiation (1.5 Å), β is the full width half maximum and θ is the angle of diffraction. The average particle size was 3.2, 17.1, 1.6 and 2.7 nm for S-NS, S-TAA, S-TA, and S-TSC, respectively.…”

Fabrication of tailored rod-shaped carbon nitride, g-C3N4, decorated with MoSe2 flowers for the catalytic reduction of nitrophenol, organic dye degradation and biocompatibility studies

“…For CNM (6 : 1), the TOF was found to be 18.40 molecules g À1 s À1 which is also relatively higher than that of the other catalysts reported. 58,59 The rate constant of the CNM (6 : 1) catalyst was found to be higher compared to other catalysts containing expensive noble metals such as Au, Pd, etc. In comparison with these reported studies, it was found that the rate constant (k, min À1 ) value obtained in the case of CNM (6 : 1) (0.71 min À1 ) was the highest among all the values listed (Table S2, ESI †).…”

“…For CNM (6 : 1), the TOF was found to be 18.40 molecules g −1 s −1 which is also relatively higher than that of the other catalysts reported. 58,59…”

Catalytic Use toward the Redox Reaction of Toxic Industrial Wastes in Innocuous Aqueous Medium and Antibacterial Activity of Novel CuxAgxZn1–2xO Nanocomposites

“…Scientists are continuously trying to improve its reductive activity by doping it with foreign elements or altering reaction conditions. Various 3d/4d transition-metal oxide, such as SnO 2 , CdS, Fe 2 O 3 , ZrO 2 , CuO, TiO 2 , and ZnO have been reported in the reduction of 4-NP to 4-nitroaniline (4-NA) in the presence of NaBH 4 . Among these, ZnO attracts attention due to its low cost, high availability, low toxicity, and high stability and can be easily doped with foreign elements to improve catalytic and photocatalytic activity.…”