Fig. 3From: Highly fluorescent hydroxyl groups functionalized graphitic carbon nitride for ultrasensitive and selective determination of mercury ions in water and fish samplesXPS high resolution spectra of C1s in G-C3N4 (A), C1s in T/ G-C3N4 (B), O 1s in T/G-C3N4 (C) and N 1s in T/G-C3N4 (D)Back to article page