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Fig. 5 | Journal of Analytical Science and Technology

Fig. 5

From: Highly fluorescent hydroxyl groups functionalized graphitic carbon nitride for ultrasensitive and selective determination of mercury ions in water and fish samples

Fig. 5

A Fluorescence emission spectra of T/G-C3N4 in 0.01 M phosphate buffer (pH = 6.0), with Hg2+ at various concentrations (0–3.0 ppm), T/G-C3N4 at 3.0 mg/L, reaction time at 5 min, and excitation at 290.0 nm. B The linear relationship between Hg2+ concentration and emission intensities. C Selectivity of T/G-C3N4 (3.0 mg/L) for various metal ions at a concentration of 3.0 ppm (where I and I0 represent the fluorescence intensities of T/G-C3N4 in the presence and absence of metal ions, respectively) and the red colored atoms refer to the new bonds (OH, NH2, NHX, and CN groups) formed onto the surface of G-C3N4 due to the partial deprotonation of melon units after thermal alkali treatment. D Fluorescence responses of T/G-C3N4 to competing metal ions (5.0 mg/L) black bars to Hg2+ ions (3.0 ppm, red and blue bars), in 0.01 M phosphate buffer (pH = 6.0), T/G-C3N4 = (3.0 mg/L), excitation at 290 nm)

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