| abstract |
Method for preparing a TiO2 photocatalyst/biomass carrier with TiO2/MxOy nanocrystals, the carrier having a size which is at least nanometric and being active in terms of photocatalysis at least in the visible range, comprising the following sub-steps: a) preparing and heating an aqueous solution of hydrochloric acid at a given pH between 0 and 6 and at a temperature between 20 and 60°C, without any surfactant, b) adding the titanium oxide precursor or the mixture of the titanium oxide TiO2 precursor and at least one other precursor of another oxide MxOy, composed of from 80 mol% to 100 mol% of TiO2 and from 0 mol% to 20 mol% of another metal or semi-metal oxide MxOy, to the acidic aqueous solution, a precipitate then being formed, and stirring the acidic aqueous reaction medium so as to dissolve the precipitate; c) a step of immersing the carrier in the acidic aqueous reaction medium, d) a step of heating the acidic aqueous reaction medium, the carrier allowing the titanium oxide precursors or the mixture of the titanium oxide precursor and at least one other precursor of the other metal or semi-metal oxide to be crystallised, e) an optional step of rinsing in water and a step of recovering the biomass carrier with the TiO2/ MxOy nanocrystals which are joined by covalent bonds to the biomass carrier. |