I have problems with my sample (Low temperature less than 100 C Bi25FeO40).I have tried it with Dye such as MO and MB, but the result was not good. Even though it has good crystalinity and low Band gap. Thank You
The problem can have different origin:
- recombination of charge carriers can be more effective than separation - especially when your material have small bandgap
- the wavelength used can be inappropriate or light intensity is too low
- maybe residues after synthesis can limit the activity of your material
- or positions of conduction band and valence band are too high/low on energy scale to perform dye degradation via ROS generation.
There is too little data in your question to answer precisely.
I used the coprecipitation method for the synthesis of bi25fe40 nanoparticles with a synthesis temperature of 100 ° C and ananneling for 4 hours at 90 ° C. and I did a photocatalyst with a dye of Methylene Blue (MB) under UV light. The initial concentration of the dye was 10 ppm and a catalyst mass of 100 mg. but I got very bad result. so I tried using methyl orange (MO) but the result was still the same. there is no significant color change and some even get a darker color so that the degradation is negative.
Thank a bunch Mr Kien. I am Challenged by my supervisor. He wants me to try doing SAR measurement from my sample (Bi25Feo40). is it recomemended for SAR measurement?
if your photocatalyst has low band gap it means that it can be exited by visible light rather than UV, so you should use visible light or solar photocatalysis directly in the presence of sun
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