What I am doing recently is to load bismuth oxybromide on foam nickel. The hydrothermal method is adopted. After hydrothermal treatment, foam nickel is dried in an 80 degree oven to degrade rhodamine. During the degradation process, catalyst particles will fall off. How can I make the catalyst load more firmly.
In my opinion, the poor fixation of the BiOBr photocatalyst to the nickel substrate is due to two reasons: too weak adhesion of oxybromide to nickel (there are no functional groups capable to form chemical bonds between these components) and an excessively high difference in the thermal expansion coefficient of nickel and oxybromide. Therefore, three approaches could be tested (in order of their feasibility):
- deposit an intermediate buffer layer, for example, made of metallic bismuth, onto the surface of the nickel substrate, then apply BiOBr to it;
- distribute BiOBr particles in a binder that does not impair the functioning of the photocatalyst (for example, like magnesium cement or a porous photo stable polymer);
- chemically modify the nickel surface, for example, by treatment it in passivating media.
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