基于短碳纳米管复合碘氧化铋-铋阴极光电化学传感平台测定毒死蜱  

Bismuth Oxyiodide-Bismuth Hybridized with Short Carbon Nanotubes as Cathode Photoelectrochemical Sensing Platform for Determination of Chlorpyrifos

作　　者：周建红 刘彰 令玉林 曾伯平[1] 张衡 邓克勤[2] ZHOU Jian-Hong;LIU Zhang;LING Yu-Lin;ZENG Bo-Ping;ZHANG Heng;DENG Ke-Qin(College of Biological and Agricultural Science and Technology,Zunyi Normal University,Zunyi 563006,China;School of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;College of Resources and Environment,Zunyi Normal University,Zunyi 563006,China)

机构地区：[1]遵义师范学院生物与农业科技学院,遵义563006 [2]湖南科技大学化学化工学院,湘潭411201 [3]遵义师范学院资源与环境学院,遵义563006

出　　处：《分析化学》2022年第2期253-262,共10页Chinese Journal of Analytical Chemistry

基　　金：2021年“乡村振兴”专项项目(Nos.黔教合KY字[2012] 017-18号、黔教合KY字[2012] 017-10号);遵义师范学院博士基金项目(Nos.遵师BS[2020]02号、遵师BS[2021]07号);赤水河流域环境保护与山地农业发展人才基地开放基金项目资助

摘　　要：通过简单的水热法将短碳纳米管(s-CNTs)与碘氧化铋-铋(BiOI-Bi)复合,制备了碘氧化铋-铋/短碳纳米管复合物(BiOI-Bi/s-CNTs)。采用扫描电子显微镜(SEM)进行表征,结果表明,BiOI-Bi/s-CNTs由负载纳米颗粒的s-CNTs和大量微球组成。瞬时光电流测量结果表明,BiOI-Bi/s-CNTs具有优良的光电化学(PEC)性能。以BiOI-Bi/s-CNTs为光电阴极,K_(3)[Fe(CN)_(6)]为光电子受体,构建了一种用于检测毒死蜱(CPF)的阴极PEC方法。由于CPF被螯合富集于阴极表面,可淬灭光电流信号,在4.0 pg/mL~10.0 ng/mL范围内,CPF的浓度与光电流变化值呈良好的线性关系,检出限(3σ)为1.89 pg/mL。本方法特异性好,灵敏度高,大白菜和卷心菜样品中CPF的加标回收率为90.0%~108.0%,表明可用于实际样品中CPF的灵敏检测。A bismuth oxyiodide-bismuth/short carbon nanotube(BiOI-Bi/s-CNTs)composite was prepared by hybridization of short carbon nanotubes(s-CNTs)with bismuth oxyiodide-bismuth(BiOI-Bi).The morphological analysis by scanning electron microscopy(SEM)showed that the prepared BiOI-Bi/s-CNTs consisted of s-CNTs loaded with nanoparticles and a large number of microspheres.Besides,the transient photocurrent displayed that the BiOI-Bi/s-CNTs had excellent photoelectrochemical performance.Thus,a novel cathodic photoelectrochemical method was developed for detection of chlorpyrifos(CPF)with BiOI-Bi/s-CNTs as photocathode and K_(3)[Fe(CN)_(6)]as photoelectron acceptor on the basis of that CPF chelated on the cathode surface and quenched the photocurrent signal.The CPF concentration in the range of 4.0 pg/mL-10.0 ng/mL was positively correlated with the quenched photocurrent,and the detection limit was estimated to be 1.89 pg/mL.The recoveries of CPF in real cabbage and Chinese cabbage were 90.0%-108.0%.This work provided a more specific and sensitive method for determination of CPF.

关 键 词：短碳纳米管 碘氧化铋 光阴极 光电子受体 毒死蜱 

分 类 号：O657.1[理学—分析化学] TS207.53[理学—化学]