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Water insoluble, self-binding viologen functionalized ionic liquid for simultaneous electrochemical detection of nitrophenol isomers
Analytica Chimica Acta ( IF 5.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.aca.2020.09.015
Manoharan Murphy , Devaraj Manoj , Duraisamy Saravanakumar , Kathavarayan Thenmozhi , Sellappan Senthilkumar

Herein, a water insoluble viologen functionalized ionic liquid (Vio-IL) was designed for the simultaneous electrochemical detection of 2-nitrophenol and 4-nitrophenol. Carboxyl functionalized benzimidazolium based ILs were hierarchically synthesized and the water insoluble carboxylic IL was covalently attached with aminopropylmethyl viologen through DCC coupling to obtain water insoluble Vio-IL gel. Vio-IL was immobilized by simple dropcasting over a multiwalled carbon nanotube deposited screen printed carbon electrode to obtain Vio-IL/MWCNT/SPE. The Vio-IL/MWCNT/SPE exhibited two sets of well-resolved redox peaks corresponding to V2+ to V+• and V+• to V0 redox couple. Furthermore, Vio-IL/MWCNT/SPE has shown excellent electrocatalytic activity towards the reduction of 2- and 4-nitrophenol individually, and also for the simultaneous determination of 2- and 4-nitrophenol. The linear range, sensitivity and detection limit for simultaneous detection of 2-nitrophenol at Vio-IL/MWCNT/SPE were found to be 4-494 μM, 0.884 μA μM-1 cm-2, 1.5 μM and that for 4-nitrophenol were 2-259 μM, 2.615 μA μM-1 cm-2, 0.70 μM. The Vio-IL/MWCNT/SPE established excellent sensitivity and selectivity towards the simultaneous determination of 2- and 4-nitrophenol together with impressive stability and reproducibility. The exemplary analytical parameters achieved are due to the rational immobilization of the mediator covalently in the highly conducting IL/MWCNT backbone which maintained the mediator characteristics effectively.

中文翻译:

用于同时电化学检测硝基苯酚异构体的水不溶性自结合紫精功能化离子液体

在此,设计了一种水不溶性紫精功能化离子液体 (Vio-IL),用于同时电化学检测 2-硝基苯酚和 4-硝基苯酚。羧基官能化苯并咪唑基离子液体分级合成,水不溶性羧基离子液体通过 DCC 偶联与氨丙基甲基紫精共价连接,得到水不溶性 Vio-IL 凝胶。Vio-IL 通过简单的滴铸固定在多壁碳纳米管沉积的丝网印刷碳电极上,以获得 Vio-IL/MWCNT/SPE。Vio-IL/MWCNT/SPE 表现出两组解析良好的氧化还原峰,对应于 V2+ 到 V+• 和 V+• 到 V0 氧化还原对。此外,Vio-IL/MWCNT/SPE 在还原 2- 和 4-硝基苯酚方面表现出优异的电催化活性,也可同时测定 2- 和 4-硝基苯酚。Vio-IL/MWCNT/SPE 同时检测 2-硝基苯酚的线性范围、灵敏度和检测限为 4-494 μM、0.884 μA μM-1 cm-2、1.5 μM,4-硝基苯酚为2-259 μM,2.615 μA μM-1 cm-2,0.70 μM。Vio-IL/MWCNT/SPE 在同时测定 2- 和 4-硝基苯酚方面具有出色的灵敏度和选择性,并具有令人印象深刻的稳定性和重现性。所获得的示例性分析参数是由于介体在高导电性 IL/MWCNT 主链中的合理共价固定,这有效地保持了介体特性。发现 Vio-IL/MWCNT/SPE 同时检测 2-硝基苯酚的灵敏度和检测限为 4-494 μM、0.884 μA μM-1 cm-2、1.5 μM,4-硝基苯酚的灵敏度和检测限为 2-259 μM , 2.615 μA μM-1 cm-2, 0.70 μM。Vio-IL/MWCNT/SPE 在同时测定 2- 和 4-硝基苯酚方面具有出色的灵敏度和选择性,并具有令人印象深刻的稳定性和重现性。所获得的示例性分析参数是由于介体在高导电性 IL/MWCNT 主链中的合理共价固定,这有效地保持了介体特性。发现 Vio-IL/MWCNT/SPE 同时检测 2-硝基苯酚的灵敏度和检测限为 4-494 μM、0.884 μA μM-1 cm-2、1.5 μM,4-硝基苯酚的灵敏度和检测限为 2-259 μM , 2.615 μA μM-1 cm-2, 0.70 μM。Vio-IL/MWCNT/SPE 在同时测定 2- 和 4-硝基苯酚方面具有出色的灵敏度和选择性,并具有令人印象深刻的稳定性和重现性。所获得的示例性分析参数是由于介体在高导电性 IL/MWCNT 主链中的合理共价固定,这有效地保持了介体特性。Vio-IL/MWCNT/SPE 在同时测定 2- 和 4-硝基苯酚方面具有出色的灵敏度和选择性,并具有令人印象深刻的稳定性和重现性。所获得的示例性分析参数是由于介体在高导电性 IL/MWCNT 主链中的合理共价固定,这有效地保持了介体特性。Vio-IL/MWCNT/SPE 在同时测定 2- 和 4-硝基苯酚方面具有出色的灵敏度和选择性,并具有令人印象深刻的稳定性和重现性。所获得的示例性分析参数是由于介体在高导电性 IL/MWCNT 主链中的合理共价固定,这有效地保持了介体特性。
更新日期:2020-11-01
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