Enhanced visible light photocatalytic activity of W-doped porous g-C3N4 and effect of H2O2

• W-doped porous g-C3N4 photocatalysts (W/PGCN) are prepared.
• W-doped promotes the separation of the photo-generated electrons and holes.
• Addition of appropriate H2O2 amount is beneficial for the photocatalytic activity.

W-doped porous g-C3N4 photocatalyst was prepared by a hydrothermal method and characterized by XRD, SEM, BET and XPS. Enhancement of degradation efficiency of methyl orange (MO) by H2O2 addition was evaluated. The degradation efficiency achieves 99.6% within 60 min under visible light. Based on first-order model, the rate constant (k) of the prepared composite is up to 3.12 times as high as that of porous g-C3N4. W-doped not only narrowed the band gap, but also promoted the separation of the photo-generated electrons and holes. The prepared photocatalyst has potential application for the wastewater treatment containing MO dye.