Monodisperse Cu/Cu₂O@C core–shell nanocomposite supported on rGO layers as an efficient catalyst derived from a Cu-based MOF/GO structure

Abstract

A novel copper/copper(i) oxide@carbon (Cu/Cu2O@C) core-shell nanocomposite monodispersed on the surface of reduced graphene oxide (defined as Cu/Cu2O@C-rGO) was synthesized using a one-step calcination of Cu-based metal organic frameworks (MOFs)/graphene oxide (GO) composite structure. The size of the resultant Cu/Cu2O@C core-shell nanoparticles (NPs) on the rGO layers were mainly distributed in range of about 90-100 nm with good dispersion, which was characterized using transmission electron microscopy. X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, nitrogen adsorption-desorption isotherms, X-ray photoelectron spectrometry and thermogravimetric analyses were also carried out to characterize the structure and composition of the Cu/Cu2O@C-rGO. The catalytic performance of the Cu/Cu2O@C-rGO composite was evaluated using a reduction reaction from 4-nitrophenol to 4-aminophenol. It was demonstrated that the Cu/Cu2O@C-rGO composite exhibited an excellent catalytic performance, which can reach a nearly 100% conversion rate in 90 s with 0.1 mg of catalyst. This catalyst also showed a good performance for the degradation of other organic dyes such as methylene blue, methyl orange and rhodamine B. Additionally, the core-shell structure exhibited good stability and reusability for the reduction reaction, which was because of its relatively better oxidation resistance than that of the bare Cu NPs. This research provided an efficient and stable non-noble metal-based catalyst derived from the MOF/GO structure.

Hierarchical Porous Integrated Co1−xS/CoFe2O4@rGO Nanoflowers Fabricated via Temperature‐Controlled In Situ Calcining Sulfurization of Multivariate CoFe‐MOF‐74@rGO for High‐Performance Supercapacitor

“…Upon sulfurization, PXRD analysis reveals that the obtained Sample-800 has lower crystallinity than that of precursor, but a broad diffraction peak at around 25° appears, which can be assigned to the characteristic (002) plane of the rGO sheets and the graphitic carbon derived from the MOF skeleton ( Figure 1c). [15] The peaks at 30.084°, 35.437°, 43.058°, 56.973°, and 62.585° correspond well to the (220), (311), (400), (511), and (440) planes of CoFe 2 O 4 (JCPDS: 22-1086), respectively. The others at 30.516°, 35.178°, 46.762° 54.266°, and 74.402° are indexed to the (100), (101), (102), (110), and (202) planes of Co 1−x S (JCPDS: 42-0826).…”

Grafting and stabilization of ordered mesoporous silica COK-12 with graphene oxide for enhanced removal of methylene blue

“… 1 Hence, recent research focuses on highly reactive photocatalytic systems that maximize the use of illumination wavelengths in the visible light region 2 or novel catalytic core–shell nanocomposites that can successfully degrade dyes. 3 Biological methods mainly use fungi or bacteria for the degradation of dyes, making them ecologically more favorable. 4 However, they are not effective for all dyes and the breakdown of some dyes by biological methods can yield harmful substances like methane or hydrogen sulfide.…”

Self-Driven Salt-Thermal Reduction Approach for the Synthesis of Cu2O and AgCl–Cu2O Hybrids with Superior Photocatalytic Activity

“…At each time interval, photocatalysts were separated by centrifugation at 10,000 rpm for 5 min, and the light absorption of the clear solution was measured by the UV–vis spectrophotometer. The degradation rate of MO was defined as follows where D is the degradation rate, C 0 and C are the absorbance value at 465 nm in UV–vis spectra before and after a given time interval of the degradation of MO, respectively.…”