Journal
CRYSTALS
Volume 13, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/cryst13040577
Keywords
photocatalysis; g-C3N4; pharmaceuticals; Acid Red 26; reactive species; intermediate products; ecotoxicity
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The study explored the photocatalytic degradation of Acid Red 26 using graphitic carbon nitride (g-C3N4) catalyst and UV-A light. Both synthetic and actual municipal wastewater showed high clearance rates, although the degradation was slower in wastewater due to its complex chemical composition. Intermediate products were identified using liquid chromatography-mass spectrometry (LC-MS), and the importance of reactive species (h⁺ and O-2⁻) in the degradation process was demonstrated.
The photocatalytic degradation of Acid Red 26 was examined utilizing a graphitic carbon nitride (g-C3N4) catalyst and a UV-A light in this study. We investigated how successfully the photocatalytic approach removed Acid Red 26 from synthetic and actual municipal wastewater. Both aqueous matrices allowed for extremely high clearance rates. Wastewater degraded at a slower rate than the other matrices, this might be ascribed to the wastewater's complicated chemical composition. Using a liquid chromatography-mass spectrometry (LC-MS), the IPs in both synthetic and actual municipal effluent were determined. The photocatalytic degradation mechanisms of Acid Red 26 are hypothesised to comprise oxidation, dealkylation, and methoxy group cleavage based on the observed intermediate products (IPs). Using proven scavengers, we were also able to investigate the role of reactive species in the degradation process and illustrate the significance of h(+) and O-2(center dot) in the reaction. Chlorococcum sp. and Dunaliella tertiolecta microalgae were also utilised to assess the development of ecotoxicity. We observed low toxicity throughout the process when clean water was used as the matrix, with no production of hazardous IPs. In the case of actual municipal wastewater, there was an early rise in toxicity, which scientists believe was caused by the matrix's chemical make-up. To lower the toxicity, a heterogeneous photocatalysis was used, and at the end of the treatment, nearly full detoxification was obtained.
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