分析化学2024，Vol.52Issue(9)：1298-1306,9.DOI:10.19756/j.issn.0253-3820.241125
化学需氧量电化学传感器研究
Research on Electrochemical Chemical Oxygen Demand Sensor
摘要
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.关键词
电催化氧化/二氧化铅电极/化学需氧量/化学需氧量传感器/羟基自由基Key words
Electrocatalytic oxidation/Lead dioxide electrode/Chemical oxygen demand/Chemical oxygen demand sensor/Hydroxyl free radical引用本文复制引用
貟姗,王磊,万立国,彭振宇,王鸿昌,翟俊峰,董绍俊..化学需氧量电化学传感器研究[J].分析化学,2024,52(9):1298-1306,9.基金项目
吉林省科技发展计划重点研发项目(No.20230203006SF)、吉林省中青年科技创新创业卓越人才团队项目(No.20240601015RC)和国家重点研发计划项目(No.2020YFB2009003)资助. Supported by the Key R&D Projects of Jilin Provincial Science and Technology Development Plan(No.20230203006SF),the Young and Middle-aged Science and Technology Innovation Leading Talents and Team of Science and Technology Department of Jilin Province(No.20240601015RC)and the National Key Research and Development Program of China(No.2020YFB2009003). （No.20230203006SF）
