Facile one-pot ultrasonic-assisted synthesis of novel Ag@RGO/g-C3N4 ternary 0D@2D/2D nanocomposite with enhanced synergetic tandem adsorption-photocatalytic degradation of recalcitrant organic dyes: Kinetic and mechanistic insights

•Facile green ultrasonic-assisted synthesis of novel Ag@RGO/g-C3N4 nanocomposites.•Ag and RGO significantly decrease the bandgap energy of g-C3N4 from 2.65 to 1.97 eV.•Ag and RGO achieved a superior reduction in the e–h recombination rates of g-C3N4.•Ag and RGO caused a synergetic enhancement in the photocatalytic activity of g-C3N4.•Ag@RGO/g-C3N4 exhibited higher adsorption capability compared to bare g-C3N4.