基于TiO_(2)纳米颗粒负载Cd^(2+)的光电化学法检测硫化物  

Photoelectrochemical Detection of Sulfide Based on TiO_(2) Nanoparticles Loaded with Cd^(2+)

作　　者：周琦 朱晓春[2] 周志成 梁伟 朱梦周 顾子扬 王欣 王玉萍[3] Zhou Qi;Zhu Xiaochun;Zhou Zhicheng;Liang Wei;Zhu Mengzhou;Gu Ziyang;Wang Xin;Wang Yuping(Jiangsu Electric Power Company Research Institute,Nanjing 211100,China;School of Automation,Nanjing Institute of Engineering,Nanjing 211167,China;School of Chemistry and Materials Science,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]国网江苏省电力公司电力科学研究院,江苏南京211100 [2]南京工程学院自动化学院,江苏南京211167 [3]南京师范大学化学与材料科学学院,江苏南京210023

出　　处：《南京师大学报（自然科学版）》2021年第3期38-44,共7页Journal of Nanjing Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(51578295).

摘　　要：本文基于Cd^(2+)与硫离子的相互作用,采用Cd^(2+)负载纳米二氧化钛(TiO_(2))颗粒的复合电极,建立了一种简易快速检测微量硫化物的光电化学测量方法.通过扫描和透射电子显微镜、X射线单晶衍射仪、紫外/可见/分光光度计等对所制备的材料和电极进行了表征.结果表明:CdS作为敏化剂,拓宽了纳米TiO_(2)光吸收范围,有效地促进光生电子与空穴的分离,使电极的光电信号显著增强.在350 W氙灯照射下,利用电流-时间法,光电流响应值与硫化物的浓度在0.001μmol/L~1000μmol/L范围内呈线性关系,检测限为0.32 nmol/L(S/N=3).该方法灵敏度高、稳定性及重现性良好,为实现硫化氢气体的快速测定和测试仪器小型化打下基础.Based on the interaction between Cd^(2+)and sulfur ion,the simple and rapid detection photoelectrochemical method for trace sulfide was studied by using Cd^(2+)doped nano titanium dioxide(TiO_(2))particles composite electrode.The prepared PEC electrodes were characterized by scanning electron and transmission electron microscopy,X-ray single crystal diffractometer,UV-vis spectrophotometer,etc.The results showed that CdS,as a sensitizer,widened the photoabsorption range of nano TiO_(2),effectively promoted the separation of photogenerated electron holes,and significantly enhanced the photoelectric signal of the electrode.Using current-time method,the photocurrent response value showed a linear relationship with the sulfide concentration within the range of 0.001μmol/L to 1000μmol/L,and the detection limit was 0.32 nmol/L(S/N=3)under 350 W xenon lamp irradiation.The method has high sensitivity,good stability and reproducibility,which lays a foundation for the rapid determination of hydrogen sulfide gas and the miniaturization of test instrument.

关 键 词：硫化物 二氧化钛 Cd^(2+)负载 光电化学法 

分 类 号：X832[环境科学与工程—环境工程] O659.2[理学—分析化学]