钛基TiO_2纳米管光电催化降解甲基橙

Photoelectrocatalytic degradation of methyl orange by titanium based TiO_2 nanotubes

采用阳极氧化法制备了TiO2纳米管,并进行扫描电镜分析。以TiO2纳米管为工作电极,石墨作对电极,对甲基橙溶液进行光电催化降解研究,考察了阳极氧化电压、时间、热处理温度、电解液组成、外加偏压的影响。结果表明,阳极氧化电压为20 V,氧化时间20 min,热处理温度500℃,V(H3PO4)∶V(NH4F)=1∶1,外加偏压为0.6 V时,甲基橙(5 mg/L)经TiO2纳米管光电催化30 min,脱色率达到96.3%。

TiO2 nanotube photoelectrodes were prepared by anodic oxidation. SEM had been used to characterize TiO2 nanotubes array. The TiO2 nanotubes were used as the working electrode with graphite as the counter electrode to study the photoelectrocatalytic degradation of methyl orange. Effect of anodizing voltage,anodizing time,calcination temperature,electrolyte composition and bias to TiO2 nanotubes was investigated. The results showed that: with anodizing voltage of 20 V,anodizing time of 20 min,calcination temperature of 500 ℃,V( H3PO4) ∶ V( NH4F) = 1 ∶ 1,bias of 0. 6 V,the decolorization rate of methyl orange( 5 mg /L) was photoelectrocatalytic to 96. 3% by TiO2 nanotubes in 30 min.