Photocatalytic degradation of bisphenol A using O-doped dual g-C3N4 under visible light irradiation

Abstract

Oxygen-doped dual precursor carbon nitride (CN-U10.3M1.7 + AF5) with ammonium formate (AF), which has both characteristics of melamine-derived carbon nitride (CN-M) and urea-derived carbon nitride (CN-U) was prepared by simple one-step heat treatment. CN-U10.3M1.7 + AF5 promotes electron-hole pair separation, controls the bandgap energy, and increases the surface area. The bandgap is controlled from 3.0 to 1.5 eV. The separation of photogenerated electron-hole pairs was efficiently promoted. The surface area was controlled from 11.6 to 91.3 m2 / g. The CN-M / CN-U photocatalyst decomposed about 20% of 5 ppm bisphenol A (BPA) in 90 min under visible light (λ ≧ 420 nm). This result is higher than when only CN-M (10%) and CN-U (15%) are used. In addition, oxygen doping significantly improves the photocatalytic activity of CN-M, CN-U, and CN-M / CN-U. The photocatalytic activity of the optimized oxygen-doped CN-M / CN-U showed a degradation efficiency of 75% in 90 min.