TiO₂ nanoparticles-enhanced luminol chemiluminescence and its analytical applications in organophosphate pesticide imprinting

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• 作者：Ju  ; Wu ; Xucheng  ; Fu ; Chenggen  ; Xie  ; ;   ; ^{lawuju@126.com} ;   ; ^{cgxie@wxc.edu.cn} ; Mei  ; Yang ; Wei  ; Fang ; Shan  ; Gao[Author vitae]
• 关键词：CPF ; TiO₂ ; Flow injection chemiluminescence ; Molecule imprinting technique ; Organophosphate pesticide
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2011
• 出版时间：15 December 2011
• 年：2011
• 卷：160
• 期：1
• 页码：511-516
• 全文大小：565 K

文摘

This paper reports a surface molecular self-assembly strategy for chlorpyrifos (CPF) imprinting of polymer membranes at the surface of TiO₂ nanoparticles for flow injection chemiluminescence (CL) detection of pesticide CPF which using the character of TiO₂ enhance the chemiluminescence of the luminol¨CH₂O₂ system. The CL signals produced by the reaction between luminol and H₂O₂, were increased in the presence of CPF imprinting of polymer membranes at the surface of TiO₂ which were eluted from the column through luminol and H₂O₂ injection. The CL enhancement by TiO₂ nanoparticles of the luminol¨CH₂O₂ system was supposed to originate from the catalysis of TiO₂ nanoparticles and CPF. The CL intensity was linear over the logarithm of concentration of chlorpyrifos ranging from 1.0 ¡Á 10^?0 to 5.0 ¡Á 10^? mol/L (r² = 0.996), and the limit of detection was 1.0 ¡Á 10^?1 mol/L (3¦Ò). The detection limit for CPF is lower than other methods. An excellent CL selectivity for CPF over other pesticides was also achieved. The combination of surface molecular self-assembly with polymer molecular imprinting on larger surface area of TiO₂ nanoparticles produce a high ratio of imprinted sites and, thus, provide an ultrasensitive CL detection of CPF.