Dear All
Please, may you help me with the best methods used for preparation of Bi2O3/TiO2 and WO3/TiO2 photocatalysts.
Regards,
There are several preparation methods that can help in providing high surface dispersion of Bi or W oxides in titania. This seems critical for the systems mentioned. We using microemulsionmfor a single pot preparation. Here examples of the two systems mentioned.
https://www.researchgate.net/publication/261373057_Composite_Bi2O3-TiO2_catalysts_for_toluene_photo-degradation_Ultraviolet_and_visible_light_performances
https://www.researchgate.net/publication/259047056_Green_photo-oxidation_of_styrene_over_W-Ti_composite_catalysts
Article Composite Bi2O3–TiO2 catalysts for toluene photo-degradation...
Article Green photo-oxidation of styrene over W-Ti composite catalysts
Hi Amal
It is quite tricky to find the best method, but you can try solid state routes with ball milling.
Dear Sudrajat
I tried incipient wetness impregnation method, but the activity of P25 itself was higher than P25/WO3 composite. I do not know what is the reason.
Regards,
Dear Amal,
WO3 possesses low quantum efficiency due to unsuitability of CB potential to reduce O2. If you are able to prepare its composite with, for example, TiO2, you may observe a synergistic effect/performance enhancement. In your case, your preparation protocol was unable to lead to a synergistic effect. Hypothetically, the accumulated electrons in WO3 CB can be transferred to TiO2. Hence, charge carriers recombination is suppressed and performance enhancement is observed. Did you work with solar, UV or visible light ?
Dear Sudrajat
I worked with UV at wavelength of 350 and i observed that the catalyst changed his color from yellow to green or blue. I do not know what is the reason for that, please.If there is a problem in this method, can you recommend a good method for preparation of WO3/TiO2. Is it OK to use sol gel method?
Regards,
Of course, it is fine with sol-gel. You may see the attached file for reference. Did you mean its color changes during operation ?
How can I prevent the reduction of W from 6+ to other state during photocatalysis process. I saw color change of catalyst during the time of photocatalysis. I think this means that there is a reduction of W and it can consume electrons so it does not degrade the organic pollutant
How can I prevent the reduction of W from 6+ to other state during photocatalysis process. I saw color change of catalyst during the time of photocatalysis. I think this means that there is a reduction of W and it can consume electrons so it does not degrade the organic pollutant
How can I prevent the reduction of W from 6+ to other state during photocatalysis process. I saw color change of catalyst during the time of photocatalysis. I think this means that there is a reduction of W and it can consume electrons so it does not degrade the organic pollutant
How can I prevent the reduction of W from 6+ to other state during photocatalysis process. I saw color change of catalyst during the time of photocatalysis. I think this means that there is a reduction of W and it can consume electrons so it does not degrade the organic pollutant
How can I prevent the reduction of W from 6+ to other state during photocatalysis process. I saw color change of catalyst during the time of photocatalysis. I think this means that there is a reduction of W and it can consume electrons so it does not degrade the organic pollutant
Dear All
Can you help me to adjust the pH during WO3/TiO2 during incipient wetness impregnation method to make a strong interaction between them
Regards,
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