Due　to　the　future　uses　of　solar　energy　in　different　areas,　such　as　the　oxidation　of　fossil　fuel-based　contaminants,　the　reduction　of　carbon　dioxide,　heterogeneous　photocatalysis,　and　the　generation　of　inexhaustible　and　renewable　hydrogen　gas　exploits　semiconductors.　As　a　metal　free　photocatalyst,　graphitic　carbon　nitride　(g-C3N4)　is　classified　to　solve　these　energy　hazards　and　ecological　difficulties　owing　to　its　excellent　electronic　structure　with　band　energy　of　about　2.7　eV,　robust　photochemical　stability,　and　better　light-harvesting　efficiency.　However,　its　photocatalytic　performance　is　still　insufficient　due　to　a　minor　surface　area　and　poor　conductivity.　Therefore,　heterojunction　formation　by　combining　it　with　a　giant　band　gap　material　is　a　potential　approach　to　reestablish　polarization　in　its　distinctive　band　structure,　increase　its　light　absorption　capacity　and　enhance　its　surface　area.　In　this　regard,　various　synthesis　techniques　have　been　applied　so　far　to　integrate　g-C3N4　and　other　materials　for　boosting　its　photocatalytic　activity.　So　far,　metal　oxide,　sulfides,　and　ferrites　are　three　crucial　groups　of　materials　that　have　been　identified　and　defined　to　be　used　to　synthesize　g-C3N4　dependent　nanocomposites.　As　a　result,　in　this　review,　we　have　compiled　a　list　of　the　most　recent　g-C3N4　nanocomposites　with　their　applications　in　solar　energy　adaptation　and　pollution　control.　This　study　concludes　an　overview　about　the　next　steps　to　study　the　nanomaterials　based　g-C3N4　composites　and　a　range　of　additional　insights　to　solve　the　present　problems.　(C)　2021　Published　by　Elsevier　Ltd　on　behalf　of　Hydrogen　Energy　Publications　LLC.