A timely update on g-C3N4-based photocatalysts towards the remediation of Cr(<sc>vi</sc>) in aqueous streams

Hexavalent chromium (Cr(vi)) is a prominent carcinogen. In environmental engineering, the elimination of hexavalent chromium from aqueous media is a noteworthy field of study. In this regard, nanoparticle science and technology have contributed significantly to the photocatalytic reduction of Cr(vi). In this review, a methodical search was undertaken to discover the most recent advancements in the field of photocatalytic reduction of Cr(vi) utilizing g-C3N4 and composites derived from it. This paper deals with the advancements and applications of g-C3N4 and its composites in the Cr(vi) remediation of water-borne pollutants. Different intriguing systems, suggested by various researcher groups, have been discussed. Different characterization techniques often conducted on photocatalysts based on g-C3N4 have also been highlighted so as to gain an understanding of the Cr(vi) removal process. Lastly, the future scope of the g-C3N4-derived photocatalysts, present challenges, and the viability of employing these photocatalysts in an extensive treatment plant have been discussed.