Ag was easily deposited on graphitic carbon nitride (g-C3N4) by shear mixing.
Ag ultrafine crystallites with high mobility were formed.
Ag/g-C3N4 revealed a high adsorption capacity for methyl mercaptan.
Ag/g-C3N4 had a high photocatalytic degradation activity under visible light.
Morphology change of Ag in the adsorption was confirmed by TEM and XPS.