Study on synthesis of oxygen-doped g-C3N4as a photocatalyst
Abstract
As a fascinating conjugated polymer, graphitic carbon nitride (g-C3N4) has attracted much attention as a metal-free and visible-light-responsive photocatalyst in the energy and environmental application. However, pure g-C3N4 performs a poor photocatalytic activity since various limitations, such as fast recombination rate of photo-induced charge carriers, weak visible light harvesting as well as low specific area study. This study reports onthemodification of g-C3N4 by O-doping, in which,the materials were prepared by heating urea(treated previously by H2O2) at 550 oC for 1h, which were denoted as x-OCN where x is the volume (mL) of H2O2(30% solution) per 10 g urea (x= 20, 40, 60 ). The obtained materials were characterized by IR, XRD, UV-Vis DRS, XPS and SEM, which demonstrated that oxygen-doped g-C3N4 has been successfully synthesized. Photocatalytic activity of g-C3N4 and x-OCN was assessed by the degradation of Rhodamine B (RhB) in visible light range. Among the x-OCN samples, 40-OCN is the best one with efficiency of 94%, 1.77 times higher than pure g-C3N4.
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