碳納米管/ TiO2 電極光電催化測定耐蘭方法探討

自合成二氧化鈦2碳納米管( TiO22CN T) 復(fù)合催化劑,用Nafion 溶液把CN T2TiO2 固定到玻
碳電極上制成CN T2TiO2 / GC 修飾電極,以耐蘭染料為測定對象,進行光電化學(xué)響應(yīng)研究. 結(jié)果表明,在p H 7. 2 的磷酸鹽緩沖液中,示差脈沖伏安法(DPV) 測定,分散蘭1 于- 0. 4V(vs Ag/ AgCl) 處產(chǎn)生良好的陰極還原峰,電極對耐蘭染料的吸附過程符合Langmuir 吸附,其光電響應(yīng)值高于碳糊/ TiO2電極. 高光電響應(yīng)意味著復(fù)合材料制成電極后,對有機染料廢水的檢測限更低,靈敏度更高.

The carbon nano2t ube/ titanium dioxide/ glassy carbon (CN T/ TiO2 / GC) elect rode was
prepared using Nafion solution to immobilize CN T2TiO2 on glassy carbon elect rode. The analysis met hod for t he p hoto2elect rochemical catalysis of nile blue was investigated. The experimental re2 sult s showed t hat t he sensor displayed an excellent elect rocatalytical response to t he Nile blue in aphosp hate buffer medium (p H 7. 2) , which was measured by using Differential Pul se Voltamme2 try. A sensitive reductive potential peak of Nile blue was observed at 20. 4V (vs Ag/ AgCl) on the CN T/ TiO2 / GC elect rode. A Langmuir type of adsorption of Nile blue on t he elect rode was found. The p hoto2elect rochemical response of t he TiO2 2CN T/ GC elect rode was st ronger t han that of t he TiO2 / carbon paste elect rode. That meant t he TiO2 2CN T/ GC elect rode had higher sen2 sitivity to and lower detection limit of dyes in wastewater .