The match of the thickness of g-C3N4 nanotubes and migration of photogenerated carrier under external magnetic field

Abstract

As a new method to obtain green and renewable energy, photocatalysis, converting from sunlight to chemical energy on the catalysts, shows its superiority since being experimentally found due to easy access and cleanliness. Graphite carbon nitride (g-C3N4), as an efficient photocatalyst with a band gap respond to visible light, is prepared in nanotube morphology by template method to provide convenience for the directional transfer of light and separation of carriers to improve photocatalytic activity and quantum efficiency. The thicknesses of g-C3N4 nanotubes (NTs) were controlled by addition amount of the precursor mass in the annealing treatment process. The migration of photogenerated electrons and holes in the wall of g-C3N4 NTs was accelerated in reverse to bypass recombination center in an external magnetic field to improve the photocatalytic activity. The critical thickness of g-C3N4 NTs wall is 72 nm for separating and impelling the photogenerated carrier pairs to the surface in the greatest extent possible and was proved by the experimental results of photoelectrochemical tests and photoluminescence spectra.