Solvent free solid-state synthesis of Pr6O11/g-C3N4 visible light active photocatalyst for degradation of AV7 dye

•A new combination of Pr6O11/g-C3N4 photocatalyst is synthesized by simple solvent free solid state method.•The photocatalytic activity of Pr6O11/g-C3N4 is investigated by degradation of AV7 dye under visible light.•Improved performance is attributed to enhanced visible light absorption and efficient charge separation as evidenced by photoelectrochemical study.•Pr6O11/g-C3N4 also exhibit super capacitance behavior.