Dear All
Please, Can the incomplete binding between P25 (TiO2) and graphene oxide decrease the photocatalytic activity?
I prepared P25/GO using colloidal blending method and tried GO from different companies and prepared it by myself, but it still P25 has a higher activity than P25/GO.
I used this method of preparation P25/GO 1%:
an aqueous dispersion of graphene oxide (0.01) was dissolved in 30 mL of deionized water.0.99 g TiO2 powder (P25, Degussa) was dispersed in 50 ml deionized water and subsequently added to the graphene oxide solution. The mixture was sonicated for 1.5 h and further stirred for 12 h at room temperature to obtain a homogeneous solution. The product was filtered and
dried in a vacuum at 50 ◦C for 4 h.
I do not know what is the problem. Does P25 not have enough hydroxyl groups or what?
The problem is in choosing GO which is electronically insulator and the mechanism behind the support material is ""graphene or rGO serves as an acceptor of the photo-generated electrons from titania and effectively suppresses the charge recombination, leaving more photo-generated holes to form reactive species and facilitate the photocatalytic activity"".
I think the interaction only is physical force, so electron is difficult to transfer from TIO2 to GO. and the GO would cover some functional TIO2 and block some light.
Dear Niu
Thanks so much for your favorable reply, but how can I avoid this problem. Please. I saw a lot of papers using this method and it enhances the activity.
Regards,
can you used hydrothermal method for loading TiO2 over GO whic make good loading for catalys over grsphene and make partial reduction for GO
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