Z-scheme overall water splitting over KNb3O8 photocatalyst and visble-light photocatalytic inactivation of E.coli

• Main Authors: Jian-Hau Su, 蘇健豪
• Other Authors: Hsin-Yu Lin
• Format: Others
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/21707401187937046866

碩士 === 國立東華大學 === 材料科學與工程學系 === 101 === The splitting of water into hydrogen and oxygen has been studied extensively, because of energy shortages in recent years. In the first part, this paper use the sol-gel and solid state sintering method to prepare potassium niobate (KNb3O8). We found the sol-gel method can use lower temperature to prepare potassium niobate(KNb3O8),and we can get higher hydrogen production activity. In the second part, we found potassium niobate (KNb3O8) has the highest bactericidal activity with 1wt% Ag by the photodeposition method. And the potassium niobate (KNb3O8) adds different amounts of Ag that can get different bactericidal activity. Final section, Z-scheme system consist to hydrogen production catalyst(KNb3O8)and oxygen production catalyst(BiVO4,WO3). I-/IO3- is redox mediator for Z-scheme system reaction. We found, different concentrations of NaI and PH value can affect the gas production activity.When 2mM concentration of NaI and PH value of 9 would have the best gas production activity in this paper. We found, the sol-gel method (KNb3O8) and commercial production of oxygen catalyst WO3 would have the best gas production activity in PH value of 9 (H2:538.72μmoleg-1h-1，O2:140.27μmoleg-1h-1) . Similarly we found the solid state sintering method (KNb3O8) and commercial production of oxygen catalyst WO3 would have the best gas production activity in PH value of 9. (H2:292.17μmoleg-1h-1，O2:130.83μmoleg-1h-1). Finally, we get the same result. The sol-gel method (KNb3O8) and BiVO4 would have the best gas production activity in PH value of 9. (H2:139.88μmoleg-1h-1，O2:49.5μmoleg-1h-1)