Research on Electrochemical Chemical Oxygen Demand Sensor
10.19756/j.issn.0253-3820.241125
- VernacularTitle:化学需氧量电化学传感器研究
- Author:
Shan YUN
1
,
2
;
Lei WANG
;
Li-Guo WAN
;
Zhen-Yu PENG
;
Hong-Chang WANG
;
Jun-Feng ZHAI
;
Shao-Jun DONG
Author Information
1. 中国科学院长春应用化学研究所,电分析化学国家重点实验室,长春 130022
2. 长春工程学院水利与环境工程学院,长春 130022
- Keywords:
Electrocatalytic oxidation;
Lead dioxide electrode;
Chemical oxygen demand;
Chemical oxygen demand sensor;
Hydroxyl free radical
- From:
Chinese Journal of Analytical Chemistry
2024;52(9):1298-1306
- CountryChina
- Language:Chinese
-
Abstract:
An electrochemical chemical oxygen demand(COD)sensor was proposed based on a FTO/TiO2/PbO2 electrode and a thin-layer electrochemical cell.The FTO/TiO2/PbO2 electrode was characterized by X-ray photoelectronic spectroscopy(XPS),X-ray diffraction(XRD)spectroscopy and electrochemical technique,and the results indicated that the rapid decrease in the output signals of the electrochemical COD sensor could be attributed to oxidation of PbSO4 occurring on the surface of FTO/TiO2/PbO2 electrode.The PbO2 deposition time and concentration of Na2SO4 were further optimized and then the electrochemical COD sensor was challenged by real samples including laker water sample,river water sample and wastewater sample.The evolution trend of signals of the electrochemical COD sensor in response to lake and river water samples was identical with that obtained with the standard method(HJ/T399-2007,Water quality-determination of the chemical oxygen demand-fast digestion-spectrophotometric method).The electrochemical COD sensor exhibited significant increase in the signal intensity after the samples were switched from lake water to wastewater sample,and a mean value of 32.5 mg/L with relative standard deviation(RSD)of 6.8%were obtained after measuring 45 times the wastewater with COD value of 30 mg/L under a sampling interval of 400 s.The as-prepared electrochemical COD sensor possessed good promise in regular monitoring of COD,discharge of wastewater and industrial process control,with advantages such as a small sampling interval,mild reaction conditions and no requirement of toxic and harmful chemical reagents.
