Rotaflex rtp300

HRTEM (JEOL JEM-2100F) and AFM (Park System model XE100 AFM) were employed to study the surface morphology of CuNi/GO-I and CuNi/GO-II. HRTEM was operated at accelerating voltage of 200 kV and a non-contact mode was opted to recode the AFM imaging. Loading of Cu and Ni was found out by recording SEM-EDS (Hitachi 3000 H SEM). To study the metal-support interaction and crystalline properties, Raman spectra (Hololab 5000, Kaiser Optical Systems Inc., USA) and powder XRD (Rotaflex RTP300 (Rigaku Co., Japan) were recorded for CuNi/GO-I and CuNi/GO-II. XPS spectra (Kratos Axis-Ultra DLD, Kratos Analytical Ltd, Japan) were recorded for fresh GO, CuNi/GO-I and CuNi/GO-II. Surface area, pore size and pore volume of the fresh GO, CuNi/GO-I and CuNi/GO-II were calculated by BET method (BELSORP-max; BEL Japan, Inc.). Catalytic performance of CuNi/GO-I and CuNi/GO-II towards reduction of nitropehnol was studied by using Ultraviolet-visible (UV-vis, Shimadzu UV-2600 spectrophotometer). Yield of the catalytic products were determined by gas chromatograph (GC, Shimadzu-2010 gas chromatograph). Nuclear magnetic resonance (NMR) spectra were recorded on a 400 MHz Bruker spectrometer in CDCl₃ using tetramethylsilane (TMS) as a standard.

Electrospinning was carried out by using a high-voltage power supply (Har-100*12, Matsusada Co., Tokyo) as the source of electric field, capable of generating voltages up to 100 kV. Transmission electron microscope (TEM) was performed on JEM-2100 JEOL Japan with accelerating voltage of 120 kV. Scanning electron microscope-energy dispersive spectrum (SEM-EDS, Hitachi, model-3000H) was used to determine the metal content in nanocomposites. Wide angle X-ray diffraction (WAXD) patterns were recorded on Rotaflex RTP300, Rigaku.Co., Japan. Nickel-filtered Cu Kα radiation was used for the measurements, along with an angular range of 10 < 2θ < 50°. Fourier transform infrared (FT-IR) spectra were taken out by using IR Prestige-21, Shimadzu, Japan. X-ray photoemission spectra (XPS) were recorded on Kratos Axis-Ultra DLD model instrument. Ultraviolet-visible (UV-vis) spectra were recorded in 3 cm path length quartz cell on a Shimadzu UV-2600 spectrophotometer. The reductive products (2- and 4-aminophenol) were further confirmed by ultra high performance liquid chromatography (Thermo UHPLC electron corporation, accucore C-18 column, solvent system water : methanol 30 : 70 ratio) at 254 nm wavelength.