As far as I known, The bandgap of Graphene Oxide (GO) is dependent on H coverage. But, GO is an organic material. Therefore, Should we use inorganic (Ev, Ec, Eg) or organic (HUMO-LUMO) energy band theory to describe the photocatalytic properties of GO?
The photocatalytic activity was determined using calculating the photodegradation efficiencies of methylene blue under UV light irradiation. Photodegradation of methylene increases with an increase in dopants concentration due to reduction in a band gap
graphene being zero bandgap shows fast recombination of excitons, and has no photocatalytic activity. it is just adsorption of dye on the graphene surface. if you want to use graphene/carbon materials for photocatalysis, you can only use carbon or graphene quantum dots. no catalysis journal accepts the photocatalysis of graphene. if you have graphene, then graphene quantum dots synthesis is not that much difficult using the following method.
You can see these papers as a reference.
Article Highly porous self-assembly of nitrogen-doped graphene quant...
Article Self-assembled nitrogen-doped graphene quantum dots (N-GQDs)...
Thanks Mumtaz Ali,
I mean Graphene Oxide (GO). GO is a photocatalytic materials right?
no it is not photocatalyst... it only adsorbs the dye, do not degrade by photocatalysis.
when GO is converted to GO quantum dots(GQDs) then it can be used for photocatalysis. in GQDs there is bandgap. in GO there is not band structure, which can show light absorption and exciton formation.
Mumtaz Ali
Chapter Graphene Materials to Remove Organic Pollutants and Heavy Me...
This document is a reference to the photocatalytic properties of GO. Is it correct?
in this also it is mentioned about adsorption.. graphene is used as a substrate for photocatalyst materials. it provides mobility to the charges to suppress their recombination. but cannot be used as a standalone photocatalyst.
That good discussion with Mumtaz Ali, I agree with him that when you use GO then it is used for adsorption purposes. GO can be doped with Ti or other semiconductors to enhance the adsorption capacity. If we have more adsorption on the surface, more photodegradation.
You cannot use GO solely for photocatalysis, BTW you can run experiment as control, with GO doped semiconductor and without GO doped semiconductor (Only GO) and only light too.
Muhammad Saqib Khan
Mumtaz Ali
Exactly, it is the story of electrons shifting from a semiconductor material to the GO layer in order to reduce the rate of electron recombination. In addition, the photocatalytic direction enhanced by GO adsorption is also remarkable.
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