SnxTi1-xO2 solid-solution-nanoparticle embedded mesoporous silica (SBA-15) hybrid as an engineered photocatalyst with enhanced activity

Faraday Discussions
N R Srinivasan, Rajdip Bandyopadhyaya

Abstract

Synthesis of hybrids of a porous host-material (with well-dispersed embedded nanoparticles inside the pore), wherein each nanoparticle has precisely controlled properties (size and composition) poses a generic challenge. To this end, a new strategy is proposed to form SnxTi1-xO2 solid-solution-nanoparticles inside the pores of sphere-like mesoporous silica (SBA-15), with different percentages of Sn in the nanoparticle (varying from 5 to 50 at%), for enhanced photocatalysis. X-ray diffraction confirms the formation of solid-solution nanoparticles in the porous silica hybrid, while the location of nanoparticles and elemental composition are identified using electron microscopy. The hybrid with 5 at% of Sn (Sn0.05Ti0.95O2-sphere-like SBA-15) shows the maximum photocatalytic activity for degradation of rhodamine-B dye (first order rate constant for degradation, k = 1.86 h(-1)), compared to both pure TiO2-sphere-like SBA-15 (k = 1.38 h(-1)) or pure SnO2-sphere-like SBA-15 (k = 0.14 h(-1)) or other hybrids in this series. XPS and PL spectra suggest the formation of more oxygen vacancies during the replacement of Ti(4+) with Sn(4+). Electrochemical studies reveal that there is a reduction of charge transfer resistance from 910 kΩ cm(-...Continue Reading

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