UV-辐照TiO_2纳米管阵列脱色甲基橙废水研究

在近中性的电解液中,采用恒电压阳极氧化法制备了TiO2纳米管阵列膜催化剂,研究了阳极氧化电压、氧化时间、电解液中氟离子浓度等对二氧化钛纳米管阵列表观形貌的影响,并分析了其晶型.以甲基橙模拟废水为目标物,测试了催化剂的光催化脱色效率.结果表明:催化剂的制备条件影响其表观形貌和晶型,进而影响其光催化效率;本实验制备的TiO2纳米管阵列的孔内径约为30~50 nm,壁厚约20~25 nm;热处理前催化剂为无定形型,550℃下热处理后的催化剂晶型以锐钛矿为主;同直接光解相比,光催化脱色甲基橙废水的效率提高了40%.

Decolorization of Methyl Orange Wastewater by UV-Irradiated TiO2 Nanotube Arrays

TiO2 nanotube arrays were prepared by potentiostatic anodization of pure Ti foils in an approximately neutral solution.The effect of anode voltage,anodization time and the mass concentration of the fluorion in electrolyte on the micromorphology of TiO2 nanotube arrays was studied.The results showed that the pore diameters and the wall thickness of TiO2 nanotubes ranges from 30 nm to 50 nm and 20 nm to 25 nm,respectively.The TiO2 nanotube arrays film is amorphous before annealing,and then turns into anatase and rutile after annealing at 550 ℃,in which anatase is dominant.Decolorization experiments of methyl orange(MO) wastewater indicated that the fabricating conditions also influence the decolorization rate of MO,and the higher photocatalytic decolorization rate is obtained by the regular TiO2 nanotube array film.Comparing with direct photolysis,the photocatalysis of TiO2 nanotubes can increase the decolorization rate of MO by 40%.