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《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:

2021年03期

Page:

38-44

Research Field:

·化学·

Publishing date:

Info

Title:

Photoelectrochemical Detection of Sulfide Based on TiO₂Nanoparticles Loaded with Cd²⁺

Author(s):

Zhou Qi¹; Zhu Xiaochun²; Zhou Zhicheng¹; Liang Wei¹; Zhu Mengzhou¹; Gu Ziyang²; Wang Xin²; Wang Yuping³

(1.Jiangsu Electric Power Company Research Institute,Nanjing 211100,China)(2.School of Automation,Nanjing Institute of Engineering,Nanjing 211167,China)(3.School of Chemistry and Materials Science,Nanjing Normal University,Nanjing 210023,China)

Keywords:

sulfide; titanium dioxide; Cd²⁺ doping; photoelectrochemical method

PACS:

X832,O659.2

DOI:

10.3969/j.issn.1001-4616.2021.03.007

Abstract:

Based on the interaction between Cd²⁺ and sulfur ion,the simple and rapid detection photoelectrochemical method for trace sulfide was studied by using Cd²⁺ doped nano titanium dioxide(TiO₂)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 TiO₂,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 0.001 μmol/L to 1 000 μmol/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.

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Last Update: 2021-09-15