碘氧化铋/氮掺杂石墨烯量子点光电化学传感器的研制及毒死蜱测定  

Development of Bismuth Iodide Oxide/Nitrogen-doped Graphene Quantum Dots-based Photoelectrochemical Sensor for Determination of Chlorpyrifos

作　　者：陈亚飞 章旭辉 杨光炜 魏小平[1] 李建平[1,2] CHEN Ya-Fei;ZHANG Xu-Hui;YANG Guang-Wei;WEI Xiao-Ping;LI Jian-Ping(College of Chemical and Bioengineering,Guilin University of Technology,Guilin 541004,China;College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学化学与生物工程学院,桂林541004 [2]桂林理工大学环境科学与工程学院,桂林541004

出　　处：《分析化学》2025年第3期364-374,共11页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(No.22264010)资助。

摘　　要：合成了具有不同(110)和(001)晶面比例的碘氧化铋(BiOI),利用BiOI的(001)和(110)晶面界面之间形成的Ⅱ型异质结,提高了光电材料BiOI光生载流子的分离效率。将BiOI(001)/(110)与氮掺杂石墨烯量子点(N-GQDs)复合,制备复合材料BiOI/N-GQDs,不但增强了光吸收的范围和强度,而且由于N-GQDs与BiOI形成Z型异质结延长了光生电子的寿命。BiOI/N-GQDs具有优异的光电性能,可产生灵敏的光电响应信号。在氟掺杂二氧化锡(FTO)电极上负载BiOI/N-GQDs作为光阴极,设计了一种用于毒死蜱(CPF)灵敏检测的光电化学传感器。CPF所含的S和N原子与BiOI表面的Bi(Ⅲ)配位,使BiOI/N-GQDs的光电流降低,CPF的浓度在1.5×10^(-12)~5.0×10^(-9) mol/L范围内,其对数值与光电流的变化值呈线性关系,检出限(S/N=3)低至1.5×10^(-12) mol/L。本传感器灵敏度高、选择性和稳定性好,并可用于环境和食品中痕量CPF的测定。Bismuth iodide(BiOI)with different crystal plane ratios of(110)to(001)was synthesized,and typeⅡheterojunction formed between(001)and(110)crystal planes of BiOI was used to improve the separation efficiency of photogenerated electrons and holes.Then the BiOI(001)/(110)was composited with nitrogen-doped graphene quantum dots(N-GQDs)to prepare a ternary composites,which could enhance the range and intensity of light absorption,and prolonged the lifetime of photogenerated electrons due to the formation of Z-scheme heterojunctions between BiOI and N-GQDs,thereby leading to the excellent photoelectric performance of the BiOI/N-GQDs for generating sensitive photoelectric response signals.A photoelectrochemical sensor for sensitive detection of chlorpyrifos(CPF)was designed with BiOI/N-GQDs-modified FTO electrode as a photocathode.The S and N atoms contained in CPF were coordinated with Bi(Ⅲ)on the surface of BiOI,which reduced the photocurrent of BiOI/N-GQDs.The photocurrent change was linear with logarithm of concentration of CPF in the range of 1.5×10^(-12)-5.0×10^(-9) mol/L,and the detection limit was 1.5×10^(-12) mol/L.The sensor was highly sensitive,selective and stable,and could be used for determination of trace CPF in environmental and food samples.

关 键 词：光电化学传感器 碘氧化铋 氮掺杂石墨烯量子点 毒死蜱 晶面调节 异质结 

分 类 号：O657.1[理学—分析化学]