Surface acidity, catalytic and photocatalytic activities of new type H3PW12O40/Sn-TiO2 nanoparticles

摘要: Abstract TiO2 and Sn+4 doped nanoparticles were prepared via the surfactant-assisted sol-gel method. Then, H3PW12O40 (PTA) was loaded over Sn-TiO2 with different PTA contents by wet impregnation The samples have been characterized XRD, TEM, SEM, FTIR, UV–vis diffuse reflection (DRS) photoluminescence spectroscopy (PL). surface acidity studied potentiometric titration pyridine used as probe molecules to distinguish between Bronsted Lewis acid sites. XRD patterns analysis indicates that crystallite size reduced remarkably increasing loading. TEM SEM images exhibit irregular particles shape amount of on increased loading up 60% wt. addition improved catalytic activity TiO2. Moreover, promoted electrons transfer recombination (e–) holes (h+). tested synthesis 7-hydroxy-4-methyl coumarin 14-phenyl-14H-dibenzo [a,j] xanthene. Both sharply after modification sample 50 wt.% showed highest activity. Also, photocatalytic performance PTA/Sn-TiO2 confirmed in degradation Methylene Blue (MB) Rhodamine B (RhB) under irradiations. mineralization MB RhB Chemical oxygen demand (COD) total organic carbon (TOC). results indicate 20%