Extensive contamination of water bodies by textile dyeing industries, organic pollutants and agricultural waste has emerged water pollution as one of the major global environmental crisis. The effect of this gross negligence is posing serious threats to human health therefore today; conserving water resources for the essence of life is of grave concern. Recently, advancements in photocatalytic properties of graphitic carbon nitride (g-C 3 N 4) for wastewater treatment have gained tremendous interest in research. However, pristine g-C 3 N 4 suffers from bottlenecks such as low surface area, rapid recombination of photo-generated electron-hole pairs and insufficient light absorption which thereby, reduces the photocatalytic degradation activity. Hitherto, noble metals have been widely utilized as dopants but are cost ineffective, rarely found and are difficult to recover. In this updated and allinclusive review we have briefly discussed photocatalysis mechanism, primarily focused on nonprecious elemental doping via various synthesis techniques of noble metal free doped g-C 3 N 4 photocatalysts. Typically metal, non-metal, rare earth metal doping and co-doping have been explored, which demonstrates the synergistic behavior of the doped nanocomposites in modulation of electronic structure, broaden the visible light absorption range, enhancement in photocatalytic wastewater remediation ability to obtain maximum pollutant eradication. Summary remarks conclude the review with valuable knowledge of noble metal free doped g-C 3 N 4 photocatalysts for water purification and sheds light on current challenges and crucial issues associated with its commercialization. The future aspect aims at designing of efficient solar light driven photocatalysts for application in various domains i.e. production of H 2 and O 2 , reduction of CO 2 , practical use of solar cells, treatment of wastewater, air purification and environmental conservation. Keywords: Graphitic carbon nitride (g-C 3 N 4); Inherent drawbacks of g-C 3 N 4 as photocatalyst; Noble metal free doping of g-C 3 N 4 ; Improved photocatalytic activity; Wastewater treatment 3. Noble metal free doped g-C 3 N 4 photocatalyst for water purification………………00 3.1 Na-K doped g-C 3 N 4 photocatalyst…………………………………………………00 3.2 Transition metal doped g-C 3 N 4 photocatalyst……………………………………00 3.3 Rare earth metal doped g-C 3 N 4 photocatalyst……………………………………00 4. Non-metal doping g-C 3 N 4 photocatalyst for water purification…………………00 4.1 Phosphorus doped g-C 3 N 4 photocatalyst…………………………………………00 4.2 Sulfur doped g-C 3 N 4 photocatalyst………………………………………………00 4.3 Oxygen doped g-C 3 N 4 photocatalyst………………………………………………00 4.4 Nitrogen, carbon, boron and halogen doped g-C 3 N 4 photocatalyst…………………00 5. Metal/nonmetal co-doping of g-C 3 N 4 photocatalyst for water purification…………00 6. Other potential applications of modulated g-C 3 N 4 …..…………00 7. Conclusion and future aspects………………………………..…………00

As an alluring metal-free polymeric semiconductor material, graphite-like carbon nitride (g-C3N4; abbreviated as GCN) has triggered a new impetus in the field of photocatalysis, mainly favoured from its fascinating physicochemical...

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