电解液中甲酰胺浓度对阳极氧化制备TiO_2纳米管阵列形貌和光催化性能的影响  

Effect of formamide in electrolyte on morphology and photocatalytic activity of TiO_2 nanotube arrays by anodization

作　　者：马清[1] 刘绍军[1,2] 翁履谦[1] 董文艺[3] 

机构地区：[1]哈尔滨工业大学深圳研究生院材料科学与工程学科部,深圳518055 [2]中南大学粉末冶金国家重点实验室,长沙410083 [3]哈尔滨工业大学深圳研究生院城市与土木工程学科部,深圳518055

出　　处：《中国有色金属学报》2011年第8期1921-1928,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家"十一五"科技支撑计划资助项目(2009ZX07423-04);财政部水专项课题(2008ZX07317-02);深圳市基础研究计划项目(JC200903120193A);中南大学粉末冶金国家重点实验开放基金资助项目

摘　　要：分别以0.5%HF水溶液(A)、0.3 mol/L NH4F+70%H2O+30%甲酰胺(体积分数)(B)、0.3 mol/L NH4F+30%H2O+70%甲酰胺(体积分数)(C)和0.3 mol/L NH4F+3%H2O+97%甲酰胺溶液电解液(体积分数)(D)作为电解液,对比研究甲酰胺含量对电化学阳极氧化TiO2纳米管阵列的形貌、结构和光催化性能的影响。结果表明:TiO2纳米管阵列长度随甲酰胺含量的增加而增加;水基电解液A中制备的纳米管长度、壁厚和管径分别约为600、20和100 nm,且分布不均匀;甲酰胺基电解液D中制备的纳米管长度、壁厚和管径分别约为10μm、5 nm和60 nm,且管径分布均匀;样品在O2中经450℃退火2 h后,发现甲酰胺基电解液A中制备的TiO2纳米管为单相锐钛矿结构,其它样品则为复合锐钛矿相和金红石相结构。光催化降解甲基橙的结果表明:随着TiO2纳米管阵列的厚度增加及管壁减小,紫外光光催化效率明显提高。The influence of the fomamide concentration in the electrolytes on the morphology and structure was investigated in the electrolytes of 0.5%HF water solution（A）,0.3 mol/L NH4F＋70%H2O＋30% formamide（volume fraction）（B）,0.3% mol/L NH4F＋30%H2O＋70% formamide（volume fraction）（C） and 0.3 mol/L NH4F＋3%H2O＋97% formamide（volume fraction）（D）.The nanotube becomes long and its wall thickness becomes smaller with increasing formamide concentration in electrolyte.The results show that the nanotube becomes longer and its wall thickness becomes smaller with increasing formamide concentration in electrolyte.The tube length,pore diameter and wall thickness of TiO2 nanotube arrays anodized in water-based electrolyte A are about 600 nm,100 nm and 5 nm,respectively.The tube length,wall thickness and pore diameter for sample anodized in formamide-based electrolyte D are about 10 μm,5 nm and 60 nm,respectively.After being annealed at 450 ℃ for 2 h in oxygen,the single anatase structure is obtained for sample anodized in electrolyte A.In contrast,the mixed anatase and rutile phase are observed in TiO2 nanotube for the other three samples.The results of photodegradation of methyl orange（MO） show that TiO2 nanotubes with longer tube length and thinner wall thickness have higher photocatalytic activity.

关 键 词：电化学阳极氧化 电解液 TIO2纳米管 光催化 

分 类 号：TQ153.6[化学工程—电化学工业] TB34[一般工业技术—材料科学与工程]