Title : Driven visible-light of strategically photocatalytic degradation of methylene blue in water over Au-Ce@Amb catalyst and g-C3N4 co-catalyst
Abstract:
For the activation of Au-Ce@Amb catalyst under visible light, the synergetic addition of g-C3N4 as co-catalyst was investigated in the driven visible-light photocatalytic degradation of Methylene Blue contaminant (dye model). Amberlite-732 (noted Amb) is cationic polymeric-resin which was exchanged with Au3+-Ce3+ mixture cations (Au3+/3H+(resin)=0.1 and Ce3+/3H+(resin)=0.9 molar ratios). This synthesized solid was calcined at 800°C under air to obtain Au-Ce@Amb catalyst. The polymer carbon nitride co-catalyst (PCN) was synthesized by clacination of melamine biocomposite at 550°C temperature. Physico-chemical characterizations of materials include: X-rays diffraction, UV-vis spectroscopy, Raman spectroscopy, scanning electron microscopy coupled to energy-dispersive Xrays spectroscopy and X-rays photoemission spectroscopy. XRD characterization of PCN indicated the presence of (100) and (002) crystallographic lines characteristic of g-C3N4 pure phase; while, XRD pattern of Au-Ce@Amb catalyst showed presence of mixture of CeO2 and Au0 phases. The photo-degradation of Methylene Blue achieved ~97% under visible irradiation after 240 min of reaction with Au-Ce@Amb and PCN together; against ~65% for PCN alone and ≈6% for Au-Ce@Am alone. It seems that the presence of co-catalyst beside catalyst has affected considerably the photocatalytic activity. In this research, a purposed mechanism will be related to contact effect of goldplasmons and PCN particles.
Audience Takeaway Notes:
- The public will be able to get informed about the synthesized polymer carbon nitride (PCN) as it is a new class of materials attracted in many applications such as the splitting of water into hydrogen, the degradation of dyes by photocatalysis. This interest is due to the structure of polymeric graphitic.
