用于测定化学需氧量的三维多孔钛复合电化学传感器的制备  

Preparation of three dimensional porous titanium composite electrochemical sensor for determination of chemical oxygen demand

作　　者：刘海涛 陈玉石[2] 邸雪梅[2] 颜家保 鲍彦舟 LIU Hai-tao;CHEN Yu-shi;DI Xue-mei;YAN Jia-bao;BAO Yan-zhou(Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials,School of Chemistry and Chemical Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Petro-CyberWorks Information Technology Co.,Ltd.,Shanghai 200120,China)

机构地区：[1]武汉科技大学化学与化工学院,煤转化与新型炭材料湖北省重点实验室,湖北武汉430081 [2]石化盈科信息技术有限责任公司,上海200120

出　　处：《现代化工》2023年第10期246-250,256,共6页Modern Chemical Industry

基　　金：湖北省技术创新专项重大项目(2017ACA179);武汉科技大学“十四五”湖北省优势特色学科(群)项目(2023B0501)。

摘　　要：以三维多孔Ti为基底、Sb_(2)O_(3)-SnO_(2)和α-PbO_(2)为中间层、β-PbO_(2)为表面活性层制备了一种用于化学需氧量检测的新型电化学传感器,并考察了该传感器的电化学特性。结果表明,该传感器最优的COD检测条件为:电解电位1.6 V,支持电解质Na_(2)SO_(4)浓度0.1 mol/L,pH 5~11。最优检测条件下该传感器在50~600 mg/L COD标准葡萄糖溶液中呈现良好的线性响应性能,检出限为8.37 mg/L(S/N=3)。实验研究了6种不同有机物的ΔI与COD的线性关系,发现有机物种类会影响羟基自由基的消耗速率,进而影响检测标准曲线与检出限。为了减少误差,在测定水样的COD时,应根据水中有机物种类按照相应的比例建立工作曲线。A novel electrochemical sensor for the detection of chemical oxygen demand is prepared by using three-dimensional porous Ti as the substrate,Sb_(2)O_(3)-SnO_(2) andα-PbO_(2) as the intermediate layer,andβ-PbO_(2) as the surface active layer.The electrochemical characteristics of the sensor are evaluated.It is shown that the optimal COD detection conditions for the sensor are as follows:electrolytic potential is 1.6 V,the concentration of supporting electrolyte(Na_(2)SO_(4))is 0.1 mol·L^(-1),and pH is in the range of 5-11.Under the optimal detection conditions,the sensor presents a good linear response performance in 50-600 mg·L^(-1) COD standard glucose solution,with a detection limit of 8.37 mg·L^(-1)(S/N=3).The linear relationships betweenΔI and COD of six different organic compounds are studied.It is found that the consumption rate of hydroxyl radical can be affected by the types of organic compounds,which further has impact on the detection standard curve and detection limit.In order to reduce the error,the working curve should be established according to the proportion of organic matters in the water when COD in water sample is measured by the sensor.

关 键 词：三维多孔钛 PbO_(2)电极 COD 电化学法 羟基自由基 

分 类 号：X832[环境科学与工程—环境工程]