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碳纳米管/ TiO2 电极光电催化测定耐兰方法探讨
王涛
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自合成二氧化钛2碳纳米管( TiO22CN T) 复合催化剂,用Nafion 溶液把CN T2TiO2 固定到玻
碳电极上制成CN T2TiO2 / GC 修饰电极,以耐兰染料为测定对象,进行光电化学响应研究. 结果表明,在p H 7. 2 的磷酸盐缓冲液中,示差脉冲伏安法(DPV) 测定,分散兰1 于- 0. 4V(vs Ag/ AgCl) 处产生良好的阴极还原峰,电极对耐兰染料的吸附过程符合Langmuir 吸附,其光电响应值高于碳糊/ TiO2电极. 高光电响应意味着复合材料制成电极后,对有机染料废水的检测限更低,灵敏度更高.
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 .
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