HYBRID EVENT: You can participate in person at Paris, France or Virtually from your home or work.
Siham Barama, Speaker at Catalysis Conferences
University of Sciences and Technology Houari Boumediene of Algiers, Algeria
Title : Driven visible-light of strategically photocatalytic degradation of methylene blue in water over Au-Ce@Amb catalyst and g-C3N4 co-catalyst


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.


Pr. Siham Barama is director of laboratory of Materials Sciences and Chemical Processes of USTHB-Algiers.University. She obtained her Doctorate in 2011, then her University Accreditation in 2017 at USTHBAlgiers. She supervised (2017- 2022) two Doctorate theses defended on theme of photocatalytic depollution of contaminated water. Pr. S. Barama has published many scientific articles on varied themes but all converging on materials such as: exchanged clays, spinels, exchanged polymeric resins and conductive metal oxides. Currently, research works of Pr. Siham Barama is centered on reaction applications such as: oxidation and dehydrogenation hydrocarbon like methane, ethane, propane and nbutane. Currently, her research focuses on the use of new technologies for development of biofuels from renewable raw materials.