Before I used the TiO2 nanofiber for photocatalytic test purposes, I used that TiO2 in powder (after the sol-gel process) for a photocatalytic test to ensure this TiO2 worked to degrade the dye solution. And it's worked to degrade the methyl orange almost 60% in 1hr.
After the electrospinning process (add with 12wt% PVA) to make the nanofiber form, the sample cannot degrade the 10ppm methyl orange although all the parameter that was used is the same as earlier (powder form). Besides that, when I put the nanofiber web (after peeling off from aluminum foil) in MO dye solution, the nanofiber shrunk.
What is the suitable condition of nanofiber for photocatalytic degradation? Is the nanofiber web (peel off from aluminum foil) of nanofiber on a glass substrate?
What kind of light did you use in the degradation experiment? TiO2 is a wide band-gap semiconductor (ca. 3.2 eV), which only absorbs ultraviolet light.
Dear all, it is usually and for enhanced performance used in a doped or nanocomposite with other oxides forms. Please read the following recent review. My Regards
https://doi.org/10.1016/j.jwpe.2022.102728
Dear Basir
As it is known, the structural parameters of fibrous composites directly affect their performance in degradation pollutants. In addition, in many cases, the preparation of camposites in the presence of titanium oxide with different structures (fibers, nanorads, nano-spheres, etc.) in the presence of polymers or other materials can cause a weakening of the structural properties of this oxide, in turn, its less photocatalytic performance.
Concerning the prepared composite , as it contains titanium oxide and PVA, the degradation process of methyl orange in its solution is expected to occur well.
I would like to draw your attention to several points that may help in avoiding some problems.
1- It is preferable to perform a structural study of the prepared titanium oxide powder using XRD and FESEM techniques in order to determine the degree of crystallinity, crystalline dimensions and other relevant measurements. For example, the prepared oxide sample can be associated with the three crystalline phases (rutile, anatase and brookite), each of which has different crystalline properties (crystalline dimensions, degree of crystallization) than the others. So, when preparing the electrospinning solution, multiple crystal structures will overlap with each other, and thus no suitable photocatalysis reaction will occur.
Please consider this point.
2- What ratio (polymer/titanium oxide) is used to prepare the compound, for example the use of high proportions of both polymer and additives leads to the formation of fibers with poor structural properties.
4- The type of light source used to carry out the degradation process on the surface of the prepared composite.
5- A comparison was made between the energy gap of all the used formulations (polymer powder, titanium oxide powder, final composite).
6- The conditions for preparing the fibers are very important by the electrospinning method.
I suggest changing the type of polymer, adjusting the amount of materials used in preparing the fibers, and conducting a comprehensive structural study of the prepared fibers. Perform PL analysis for all materials.
With regards,
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