Comparative Effects of Graphitic Carbon Nitride Precursors on the Photocatalytic Degradation of Pyrene

Abstract:

Pyrene is a ubiquitous, persistent, and mutagenic pollutant that belongs to the polycyclic aromatic hydrocarbons. Graphitic carbon nitride (g-C₃N₄) has emerged as a promising photocatalyst for degradation of various pollutants in water and wastewater treatment due to its unique band structure and excellent physiochemical stability. This paper presents the comparative study of composites g-C₃N₄ from various combinations of precursors using thermal polycondensation at 600 °C. Comparative experiments revealed that the preparation conditions of both precursors and the mass ratios of precursor influenced the overall performance of photocatalyst during photocatalytic degradation of pyrene. Experimental results indicated that the best performance of composites g-C₃N₄t photocatalyst was prepared from a wet mixture of dicyandiamide and guanidine carbonate precursors at a mass ratio of 1:1 with 43.9 % pyrene degradation under visible light irradiation for 240 mins. The reusability of the best g-C₃N₄ composites for the photocatalytic degradation of pyrene was also investigated. It was found that the prepared photocatalyst was stable up to five cycles of photocatalysis. Meanwhile, holes (h⁺) and hydroxyl radicals (·OH) were identified as the primary and secondary dominant reactive species in the photocatalytic degradation through scavenging trapping experiments.

• Periodical: Materials Science Forum (Volume 1076)
• Pages: 181-191
• DOI: https://doi.org/10.4028/p-y056c4
• Online since: December 2022
• Authors: Syarifah Nurhusna Qadirah Syed Abd Halim*, Noor Aina Mohd Nazri, Nik Abdul Hadi Sapiaa Md Nordin
• Keywords: Composites g-C₃N₄, Photocatalytic Degradation, Pyrene Pollutants, Scavenging Trapping Reactive Species, Water Treatment

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