Fig. 7. Absorption spectra of Hg(ii) in aqueous solutions, (a) the UV-Vis spectra of sensing system (TMB + ZnO–g-C3N4/MoS2 + GSH + H2O2) with different concentrations of Hg(ii) ions, (b) graph plot of absorbance values with respect to the increasing concentrations of Hg(ii), (c) photographic image of Hg(ii) ion sample solutions with the concentration range 1 nM to 1 μM.
