B and Y co-doped TiO2 photocatalyst with enhanced photodegradation efficiency

摘要: Abstract B and Y doped titanium dioxides (TiO2) photocatalysts were synthesized by a sol-gel method followed calcination. It is observed that the photodegradation efficiency of co-doped TiO2 twice undoped sample. To explore underlining mechanism, x-ray diffraction, Raman, scanning electron microscope, photoemission, UV–Vis diffuse reflectance spectroscopy measurements have been carried out to investigate effect doping on structural, electronic, optical properties titania. Experimental observations revealed in lattice Y3+ ions tend replace Ti4+ while B3+ occupy interstitial sites. The incorporation boron dopants will create oxygen vacancies ( Ov ·· ) reduce Ti3+ form [ -Ti3+]+ complex, which traps carriers prolongs carrier lifetime. Moreover, can trap photo-excited electrons Y2+ ions, then react with absorbed O2 surface generate reactive species. In addition, all samples smaller crystallite sizes. formation interstitials substitutes, increased surface-to-volume ratio are beneficial improve photocatalytic activity.