No abstract

Graphitic carbon nitride (g-C3N4) was synthesized at 520°C by the pyrolysis of cyanamide, dicyandiamide, and melamine. The samples were characterized by X–ray diffraction (XRD), UV-visible diffuse reflectance spectra, Fourier transform infrared spectroscopy (FT-IR), and elemental analyzer. The photocatalytic activity of g-C3N4was evaluated by the photodegrading experiments of methylene blue (MB). The results indicated that g-C3N4. A photocatalytic mechanism presumed the MB photodegradation over the C3N4photocatalyst is attributed to photogenerated electron impelled multistep reduction of O2.

The synthesis and application of bifunctional mesoporous Al‐P‐V—O catalysts with both acidic and redox sites for selective oxidation of methanol to dimethoxymethane (DMM) is described. The catalysts were characterized by N2 adsorption/desorption, X‐ray diffraction, temperature‐programmed desorption, X‐ray photoelectron spectroscopy, and infrared spectroscopy. It is shown that porosity; redox property and surface acidity of the catalysts were greatly influenced by the Al/V/P ratio. The synergistic effect of phosphorus and vanadium was investigated. Al‐P‐V—O catalysts exhibited good catalytic activity because of the controlled reducibility and the acidic sites. © 2013 American Institute of Chemical Engineers AIChE J, 59: 2587–2593, 2013

The graphitic carbon nitride (g-C 3 N 4 ) was synthesized by the polymerization of dicyandiamide, then silver hybrid g-C 3 N 4 (Ag/g-C 3 N 4 ) catalyst was prepared by photodeposition, deposition-precipitation, and doping methods. The first two methods deposited silver nanoparticles on the surface of g-C 3 N 4 semiconductor, while the last one embedded silver atom into the g-C 3 N 4 matrix without destroying the host structure. The photodegradation behavior of methylene blue (MB) aqueous solution over Ag/g-C 3 N 4 catalyst was performed to evaluate the photocatalytic activity of the as-prepared samples. The samples were characterized by XRD, UV-vis spectroscopy, FT-IR spectroscopy, elemental analysis and TEM. The experiment results indicate that the Ag/g-C 3 N 4 prepared by the doping method possesses the best photocatalytic activity, which can be explained by promoting the transfer of electron due to the formation of organic-metal hybrid material.