二氧化钛纳米管阵列制备及其对甲基橙的降解应用

摘要

Objective]To develop a new type of titanium dioxide (TiO2) photocatalyst for the degradation of organic pollutants.[Method] Tita-nium based titanium dioxide (TiO2) nanotube arrays were prepared by electrochemical oxidation method,and their microstructures were charac-terized,degradation of methyl orange was used to investigate the sintering temperature ,initial dye concentration and the effect of pH on the catalyt-ic performance of TiO2 nanotube arrays.[Result] The results showed that TiO2 nanotube arrays prepared by sintering temperature at 500 ℃had good morphology and the highest photocatatytic degradation efficiency; The efficiency of dye degradation with higher initial concentration was higher than that of low concentration by TiO 2 nanotube arrays;The degradation efficiency of methyl orange solution of pH 3 was higher than that of pH 5.77 by TiO2 nanotube arrays.The degradation efficiency of methyl orange solution of 10 mg/L (pH 3) by TiO2 nanotube arrays (500 ℃) in 60 minutes could reach 85.2%.[Conclusion] The effective photocatalytic degradation of organic dye by the TiO2 nanotube arrays made in this paper has broad application prospects in the field of dye wastewater decolorization and so on .%[目的]研制一种新型的TiO2光催化材料，用于有机污染物的降解。[方法]采用电化学氧化法制备了钛基TiO2纳米管阵列，表征其微观结构，以甲基橙为降解对象，考察了烧结温度、染料初始浓度和pH 对TiO2纳米管阵列催化降解性能的影响。[结果]500℃烧结温度条件下制得的TiO2纳米管阵列形貌良好且降解效率最高；TiO2纳米管阵列对初始浓度较高的染料降解效率高于低浓度的；甲基橙溶液pH为3时，TiO2纳米管阵列对其降解效率高于pH为7时；TiO2纳米管阵列（500℃）对10 mg／L甲基橙溶液（pH 3）60 min降解效率可达85．2％。[结论]该试验制备的TiO2纳米管阵列可有效光催化降解有机染料，在染料废水脱色等领域具有广阔的应用前景。