Dear All
I am using colloidal blending method for preparation of TiO2/Graphene oxide composite, but sometimes I found that some TiO2 pass through the filter paper. I think this is due to bad binding between TiO2 and Graphene oxide. I follow the following procedures: an aqueous dispersion of graphene oxide was dissolved in deionized water. TiO2 powder (P25, Degussa) was dispersed in 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.
Please, can you help me to know the reason and how can I avoid this matter?
Should I disperse P25 in a specific amount of water using ultrasonic?
Regards,
Hi Amal,
You should consider use another paper filter with different dimensions, or use an centrifuge to separate your material from your solvent. Maybe this behavior is due to the nanoparticle size.
Best regards
Hi Gomes
Please, what do you mean by "Maybe this behavior os duelos tô the nanoparticle size". Can you write in English. Are there any tricks that I should follow during mixing of P25 with GO.
Regards,
Sorry Amal,
The auto correct of the cell phone did a mess.
Actually we have worked with this subject, following this paper:
TiO2 nanoparticles assembled on graphene oxide nanosheets with high photocatalytic activity for removal of pollutants, Guodong Jiang.
LINK: http://www.sciencedirect.com/science/article/pii/S0008622311001655
Dear Gomes
I use colloidal blending method for preparation of GO/P25, but why the paper makes calcination at 200 C. May be this high temp cause GO to be partially reduced or what is the benefit of that. I always use 50 C for drying only.
Regards,
Dear Gomes
I use colloidal blending method for preparation of GO/P25, but why the paper makes calcination at 200 C. May be this high temp cause GO to be partially reduced or what is the benefit of that. I always use 50 C for drying only.
Regards,
Dear Gomes
I use colloidal blending method for preparation of GO/P25, but why the paper makes calcination at 200 C. May be this high temp cause GO to be partially reduced or what is the benefit of that. I always use 50 C for drying only.
Regards,
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