基于Fe:TiO2纳米片的光电化学传感器用于水中Cr6+的检测  

A Novel Fe:TiO2 Nanosheets Photoelectrochemical Sensor for Determination of Hexavalent Chromium in Water

作　　者：罗燕妮 万玉丽 米艳 谭学才 黄月慧 陈全友 冯德芬 艾晨昊 LUO Yan-ni;WAN Yu-li;MI Yan;TAN Xue-cai;HUANG Yue-hui;CHENQuan-you;FENG De-fen;AI Chen-hao(Guangxi Key Laboratory of Chemistry and Engineering of Forest Products,Key Laboratory of Guangxi Colleges and Universities for Food Safety and Pharmaceutical AnalyticalChemistry,School of Chemistry andChemical Engineering,Guangxi University for Nationalities,Nanning530008,China)

机构地区：[1]广西民族大学化学化工学院广西高校食品安全与药物分析化学重点实验室广西林产化学与工程重点实验室

出　　处：《分析测试学报》2019年第6期712-717,共6页Journal of Instrumental Analysis

基　　金：国家自然科学基金(21365004);广西重点研发计划(AB18126048);广西科技基地和人才专项(AD18126005);广西高等学校高水平创新团队及卓越学者资助计划(桂教人[2014]7号);广西民族大学研究生教育创新计划(gxun-chxzs2017125)

摘　　要：建立了一种基于Fe∶TiO2纳米片的光电化学(Photoelectrochemical,PEC)传感器检测Cr^6+的简单有效新方法。以钛酸四丁酯和三氟化铁为原料采用水热法合成Fe∶TiO2纳米片,通过扫描电镜(SEM)、X-射线衍射(XRD)和紫外可见吸收光谱(UV-Vis)对纳米片进行表征,采用电化学方法对修饰电极进行表征,考察了Fe掺杂量、Fe∶TiO2浓度和偏置电压的影响。该传感器在光照射下,利用Fe∶TiO2将Cr^6+还原为Cr^3+,Cr^3+与OH-反应生成Cr(OH)3后沉积在电极表面,从而引起光电流的降低,达到检测的目的。研究表明,该传感器检测Cr^6+的线性范围为0.008~100μmol/L(r2=0.9995),检出限(S/N=3)为0.004μmol/L。方法具有良好的抗干扰性和稳定性,其加标回收率为99.3%~119%,RSD为2.3%~2.8%。表明该光电化学传感器可用于实际样品的检测。A novel,simple and effective method was developed for the detection of Cr^6+ using a photoelectrochemical (PEC ) sensor based on Fe ∶ TiO2 nanosheets in this paper.Fe ∶ TiO2 nanosheets was synthesized by hydrothermal method using C 16 H 36 O 4Ti and FeF 3 as raw materials,which were characterized by scanning electron microscopy (SEM ),X-ray diffraction (XRD ) and UV absorption spectroscopy (UV-Vis ).Electrochemical methods were adopted to characterize the modified electrode.And the test conditions for Fe doped amount,Fe ∶ TiO2 concentration and bias voltage were investigated.Under the illumination of light,the Fe ∶ TiO2 nanosheets reduced Cr^6+ to Cr^3+.When Cr^3+ reacted with OH -,Cr (OH )3 was formed and deposited on the surface of the electrode,resulting in the decrease of photocurrent so as to achieve the purpose of detection.Results showed that the linear range of the sensor for detection of Cr 6+ varied from 0.008 μmol/L to 100 μmol/L ( r^2= 0.999 5 ),with a detection limit of 0.004 μmol/L.The sensor was applied in the detection of actual samples with good sensitivity and selectivity.The spiked recoveries were in the range of 99.3 %-119 % with relative standard deviations (RSD ) of 2.3 %-2.8 %,indicating that the photoelectrochemical sensor has a great application potential in the selective detection of Cr^6+.

关 键 词：Fe∶TiO2纳米片 光电化学传感器 CR^6+ 

分 类 号：O657.1[理学—分析化学] O614.31[理学—化学]