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.