growth of N-doped carbon nanotubes from the products of graphitic carbon nitride etching by nickel nanoparticles.

The growth of N-doped multi-walled carbon nanotubes (N-MWCNTs) from the products of graphitic carbon nitride (g-CN) etching by Ni nanoparticles in a hydrogen atmosphere has been confirmed for the first time. During the etching process of g-CN, the building blocks, notably methane, ammonia, and hydrogen cyanide, are formed. The formation of N-MWCNTs was confirmed by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning (SEM) and transmission electron microscopy (TEM).

Reductive Modification of Carbon Nitride Structure by Metals-The Influence on Structure and Photocatalytic Hydrogen Evolution.

Pt, Ru, and Ir were introduced onto the surface of graphitic carbon nitride (g-CN) using the wet impregnation method. A reduction of these photocatalysts with hydrogen causes several changes, such as a significant increase in the specific surface area, a C/N atomic ratio, a number of defects in the crystalline structure of g-CN, and the contribution of nitrogen bound to the amino and imino groups. According to the X-ray photoelectron spectroscopy results, a transition layer is formed at the g-CN/metal nanoparticle interphase, which contains metal at a positive degree of oxidation bonded to nitrogen.

Synthesis and characterization of MgF-CoF binary fluorides. Influence of the treatment atmosphere and temperature on the structure and surface properties.

Research was carried out on the incorporation of divalent cobalt cations into the crystalline structure of MgF to form Mg Co F binary fluorides, which had not been investigated before. The above fluorides were obtained by the precipitation from aqueous solution of magnesium and cobalt nitrates with ammonium fluoride. Binary fluorides containing 0.