Effect of Biogenic Silica Behavior in the Incorporation of Mesoporous Anatase TiO2 for Excellent Photocatalytic Mineralization of Sodium Diclofenac

TiO2/SiO2 composites were synthesized via a simple sol gel method by surface reduction of Ti4+ ions to Ti3+ using titanium isopropoxide as TiO2 precursor and rice husks (RHA) SiO2 source. The silica content calcination temperature the materials evaluated. Thermal, crystallographic physicochemical aspects suggest that biogenic (SiO2) can improve thermal stability anatase phase TiO2, when reaches 20%. N2 adsorption-desorption isotherms showed SiO2-modified samples have uniform pore diameters large specific area. XPS analysis within network oxygen vacancies after introduction, which is beneficial for photocatalytic reaction. Photocatalytic degradation sodium diclofenac (SDFC) shows better activity compared commercial P25. Mesoporous composite modified with 20 wt% mineralization than P25 (83.7% 2 h instead 57.3% P25). excellent photocatalysts be attributed high crystallinity exhibited XRD analysis, area, hydroxyl groups, creation vacancy, well presence ions.