Flower-Like G-C3n4 Undoped in Situ Fabrication Defects as Photocatalysts for Enhanced Degradation of Organic Pollutants

In order to solve the problem of weak response of graphite phase carbon nitride (g-C3N4 ) as a photocatalyst under visible light and low photocatalytic efficiency, we have further optimized the g-C3N4 catalyst. In this study, we performed a second calcination treatment on g-C3N4 to prepare flower-like porous g-C3N4 (CN2). The obtained product was characterized by its unique flower-like porous structure, comes with a larger specific surface area. At the same time, the appearance of oxygen vacancies was due to multiple calcinations in air create. Compared with the traditional g-C3N4 , the CN2 sample has a narrower band gap, which is more conducive to charge separation, so the absorption of visible light is enhanced, and the photocatalytic degradation activity of organic pollutants rhodamine B (RhB) and o-phenylphenol (OPP) is greatly improved. Through comparison of related studies, it is found that the catalyst effect of this study is significantly better than some non-metal or metal-doped modified g-C3N4 . Through the total organic carbon test, 80% of the OPP is mineralized by the CN2 system. Furthermore, ·O-2 and h+ were verified as the main active species for the photocatalytic degradation of RhB. This work provides an effective and simple method for the preparation of more efficient and low-cost oxygen vacancy g-C3N4 , and provides a new idea for the development of photocatalysis, which can be more widely used in actual production