that the existence of sulphur in thiourea enhances the extent of condensation as well as polymerisation of thiourea that aided the connectivity and packing of g-C3N4 sheets. In another Moreover, it has been revealed that variation of the nitrogen-rich precursors prior to the pyrolysis could obtain g-C3N4 with enriched physicochemical properties. One of the amendment approaches is the acid pre-treatment of the nitrogen-rich sources. Yan et al.