g-C₃N₄ composited TiO₂ nanofibers were prepared by high voltage electrostatic spinning to improve photocatalytic efficiency

Abstract

Semiconductor photocatalysis technology is one of the ways to control environmental pollution using solar energy. Because of its chemical stability, low toxicity and high photocatalytic oxidation-reduction ability, titanium dioxide has become one of the most widely studied and applied semiconductor photocatalytic materials. However, there are also some problems such as the response only in the ultraviolet range, rapid recombination of electron pairs produced by light during photodegradation, and the small specific surface area. On account of the limitations of titanium dioxide photocatalyst, the key factors and breakthroughs to improve performance new materials, this paper uses g-C₃N₄ of improving the photocatalytic function of titanium dioxide. Because g-C₃N₄ has good conductivity, relatively strong adsorption capacity and larger specific surface area compared with other carriers, g-C₃N₄ is one of the most promising carriers. In this research work, g-C₃N₄/TiO₂ heterogeneous nanocomposites were prepared by combining TiO₂ nanowires with g-C₃N₄. First of all, we need to change the morphology of titanium dioxide. We use high-voltage electrospinning technology to achieve this goal. This method greatly increases the specific surface area and increases the active sites involved in photocatalytic activity. Then, g-C₃N₄ was prepared with melamine as raw material by high temperature calcination. Then, the hydrothermal method combined with the good characteristics of g-C₃N₄ enhanced the deflection of photogenerated electrons and prolongs the lifetime of photogenerated electron-hole pairs. The photocatalytic efficiency of nanocomposites is greatly improved Rhodamine B solution was completely degraded in 120 min.