Dear All
I tried TiO2 (P25)/graphene for degradation of carbofuran, but it decreases the activity. It was not good for my compound. Can you help me if Ag/P25 (TiO2) will work efficiently for degradation of carbofuran pesticide ?
Regards,
I use commercial TiO2 (P25). I use the composite for degradation of carbofuran pesticide
what is % of graphene in your composite
increasing in the amount of graphene led to a reduction of the activity.
This is reasonable because the introduction of a slightly higher
percentage of the black MG hybrid can lead to a significant
increase in the opacity which reduces the UV absorption of TiO2 previous work say that maximum % of Gr in composites =5%
may be there are no chemical loading in your composite due to method of preparation
You Should check the adjustment of conduction and valance bands of Ag/TiO2 for transporting of electrons and holes in this system. For degradation of chemicals holes should be available to them. May be Ag particles prevent this mechanism.
Dear Soraya
Please, how can i check the adjustment of conduction and valance bands of my catalyst
Regards,
Hi Amal,
You may first check the electronic structure from literature articles for quick information.
You can use DRS, XPS, UVP, cyclic voltammetry, DFT simulation, etc. DRS can only give you band gap value. XPS gives you VB position. UVP and cyclic voltammetry can give you band gap and CB/VB position. DFT gives you theoretical band gap and CB/VB position. In addition, Mott-Schottky plots can also give you the position of the flat band potentials.
Your HK institution is obviously able to provide such techniques and further information is highly accessible as well if you are a new comer.
Dear Amal, I have seen in papers that for this determination, cyclic voltammetry can be used. you can search and find it. there is a paper that I can suggest : Growth and photovoltaic performance of SnS quantum dots, K.G. Deepa, J. Nagaraju, Materials Science and Engineering B 177 (2012) 1023– 1028. In this paper the authors used this method to determine The HOMO–LUMO levels of their system. It may be helpful to you.
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