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A novel recoverable photocatalyst g-C 3 N 4  nanorods have been synthesised by using melamine and adopting the hydrothermal method. Graphitic carbon nitride has been characterised by a wide range of characterisation techniques like XRD, SEM, EDX, PL and FTIR. Their effect on degradation of organic dyes, methylene blue (MB), methylene orange (MO) and Rhodamine-B (Rh-B) have been studied along with factors of pH 0–5 and pH 8–14. Remarkably, g-C 3 N 4  could degrade 99% of MO, 97% of MB and 99.9% of Rh-B with pH 0–5, and 97.7% of MO, 98% of MB and 99.5% Rh-B with pH 8–12, respectively. This catalyst has superior dye degradation efficiency (99.9% and 99.5%) for Rh-B for both the factors pH 0–5 and pH 8–12. The trapping experiment results portrayed that the superoxide radical anion (•O 2 −) and holes (h + ) have played major role for the degradation of Rh-B, MB and MO dyes. Based on the trapping experiment results, a tentative photocatalytic mechanism has also been proposed.

Synthesis of g-C 3 N 4 nanorods for visible-light photocatalytic degradation of methylene blue, methylene orange and rhodamine-B