Figure presents both a schematic and experimental results for the two strategies of cocatalyst functionalisation of TiO 2 P-25 nanoparticles followed by their attachment to SiO 2 microparticle supports. In Figure ), the functionalisation of TiO 2 nanoparticles with Pt nanoparticles via solvent evaporation from MeOH is presented in a-I, followed by their attachment under bulk stirring to SiO 2 microparticle supports in a-II. Likewise, the growth of Au nanoparticles from solution, following the recipe presented in, 54 is demonstrated in Figure ). We find that the dispersion of TiO 2 P-25 and Pt nanoparticles in MeOH, as well as the use of a urea precipitating agent for the controlled growth of Au nanoparticles onto the TiO 2 , does not affect their attachment via the nitro-catechol functional group onto the SiO 2 microparticles. The presence of the metal co-catalysts on the TiO 2 supported on the SiO 2 microparticles, visualised by STEM imaging, confirms that we do not selectively bind unfunctionalised TiO 2 onto the SiO 2 . In particular, we find the results presented in a) promising, as the Co4Cat (colloids for catalysts) approach outlined by Quinson et al. is broadly applicable to a range of metallic and bimetallic nanoparticles, indicating the possibility of tailoring the supported nanoparticles towards a desired application.