Study of Preparation, Growth Mechanism and Catalytic Performance of Carbon Based Embedded Silver Nano Composite Materials

Abstract

Novel and stable carbon based embedded silver nano composite materials (Ag/ CSs) were successfully prepared by a facile one-pot hydrothermal method with trioctylamine (TOA) as soft template and stabilizer. These as-prepared Ag/CSs exhibit well-defined shape and relatively uniform size with an average diameter of 1.5 μm and uniformly embedded Ag nanoparticles about 5 nm. The proper proportion of glucose, AgNO 3 and TOA is the key to the common growth of hydrothermal carbon materials and silver nanoparticles in an embedded way. Besides, the thickness of carbon sphere matrix and the size of Ag particles can be tailored precisely by adjusting the experimental parameters. In order to facilitate comparative analysis, carbon spheres (CSs) without Ag particles embedded were also prepared with glucose under the same hydrothermal reaction conditions. The composition, structure and morphology of the as-prepared Ag/CSs and CSs were confirmed by X-ray powder diffraction (XRD), FT-IR spectroscopy, Raman spectrum, Transmission electron microscopy (TEM) and scanning electron microscopy (SEM). In addition, the possible formation mechanism of the Ag/CSs has been proposed based on experimental evidences. Finally, the as-prepared Ag/ CSs and CSs were used as catalysts in the experiments of photocatalytic degradation of methylene MB in water under visible light irradiation and the high efficiency of photocatalytic performance of Ag/CSs has been verified.

Self-Assembled Silver Nanoparticles Decorated on Exfoliated Graphitic Carbon Nitride/Carbon Sphere Nanocomposites as a Novel Catalyst for Catalytic Reduction of Cr(VI) to Cr(III) from Wastewater and Reuse for Photocatalytic Applications

“…The surface area, pore volume, and pore size were observed by the Brunauer−Emmett−Teller (BET) method with nitrogen adsorption−desorption processes. 115 120 The ζ potential of Eg-C 3 N 4 showed a positive potential at 12.1 mV, which is due to the protonation of Eg-C 3 N 4 with H 2 SO 4 . CS displayed a higher negative charge potential at −38.6 mV due to the several oxygen atoms of COOH and OH groups.…”

“…The surface area, pore volume, and pore size were observed by the Brunauer–Emmett–Teller (BET) method with nitrogen adsorption–desorption processes Figure S2A–E (Supporting Information) shows the surface areas of Bg-C 3 N 4 , Eg-C 3 N 4 , CS, Eg-C 3 N 4 /CS, and AgNP/C 3 N 4 /CS nanocomposites, which were determined by isothermal N 2 adsorption–desorption BET methods at 10 °C/min. − These obeyed the type H3 hysteresis loop model and also assumed mesoporous and macroporous properties by Barrett–Joyner–Halenda (BJH) plots with pore size distribution range 10–100 nm, as shown in Figure S2A–E (inset), Supporting Information.…”