title: Effect of coupled semiconductor system treating aqueous 4-nitrophenol.
abstract: This article describes a method for treating aqueous 4-nitrophenol by mixing with TiO2-SnO2 coupled particles. The reactivity of single photocatalysis (TiO2 and SnO2 all as 1.2 g/L) is compared with that of mixing TiO2-SnO2 (0.6 g/L + 0.6 g/L) coupled particles. Aqueous 4-nitrophenol was treated by single photocatalysis or coupled semiconducting particles in a double-layer glass batch reactor using a 15W UV fluorescent tube at 25 degrees C and 300 rpm for mixing. The results demonstrated that pH and the concentration of TiO2 were the factors that most influenced the degradation characteristics, and that the system of TiO2-SnO2 coupled particles improved the efficiency of removal of refractory organic pollutants by 15%, by the inter-particle electron transfer (IPET) effect. The results showed that the degradation of aqueous 4-nitrophenol was 75% when coupled particles were used--better than the 60% obtained using single photocatalysis--with a reaction time of 120min.
authors.affiliation: Department of Environmental and Safety Engineering, National Yunlin University of Science and Technology, Touliu, Yunlin, Taiwan. kuocy@yuntech.edu.tw
authors.forename: Chao-Yin
authors.initials: CY
authors.lastname: Kuo
authors.forename: Han-Yu
authors.initials: HY
authors.lastname: Lin
mesh_terms: D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry; D009596:Nitrophenols / Q000302:isolation & purification*; D010777:Photochemistry; D012666:Semiconductors; D014025:Titanium / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D009596:Nitrophenols; C009495:titanium dioxide; D014025:Titanium; C024836:4-nitrophenol