fig3
Figure 3. Photocatalytic measurements. UV-Vis absorption spectra for 4-NP reduction with (A) HCN and (B) BCN; (C) Photocatalytic reduction plots of 4-NP for HCN and BCN under visible light; Photocatalytic reduction plots of 4-NP with HCN under visible light at (D) different concentrations, (E) catalyst amounts, and (F) different pH values; (G) Summary of Kapp values under different reaction conditions; (H) Recyclability of HCN as a photocatalyst in the reduction of 4-NP under visible light irradiation; (I) XRD comparison of the HCN catalyst before and after four cycles. UV-Vis: Ultraviolet-visible; 4-NP: 4-nitrophenol; HCN: crystallized carbon nitride homojunction; BCN: bulk phenazine-based C3N4; XRD: X-ray diffraction.
