基于聚苯胺的pH电极及其在CO2检测中的应用研究  

Study on Polyaniline Modified pH Electrode and Its Applicaion in CO_2 Sensing

作　　者：金妍[1,2,3] 瞿晓虎 陈淼 金庆辉[1] 赵建龙[1] 

机构地区：[1]中国科学院上海微系统与信息技术研究所传感技术联合国家重点实验室,上海200050 [2]CSIRO Process Science and Engineering,Box 312,Clayton south,Victoria 3169,Australia [3]中国科学院大学,北京100049

出　　处：《传感技术学报》2013年第10期1468-1472,共5页Chinese Journal of Sensors and Actuators

基　　金：国家科技支撑计划项目(2012BAK08B05);上海市创新行动计划项目(201101042,11CH_15,11530700800,11391901900)

摘　　要：研制了一种基于聚苯胺（ PANI）的石墨pH电极，并将其成功地应用于CO2的检测中。在苯胺和盐酸的混合液中采用循环伏安法实现苯胺在石墨电极上的电聚合。实验表明，此基于聚苯胺的石墨pH电极在pH 1~pH 12的范围内呈现出很好的响应：-63.80 mV/pH（T=23℃），-65.81 mV/pH（T=48℃）。根据Severinghaus原理，研究了此传感器在pH 4~pH 9内的pH响应情况，证明此聚苯胺修饰的石墨pH电极可被成功地应用于CO2的检测中，此CO2传感器在CO2浓度为0~1000 mbar的范围内，呈现很好的响应特性：S=42.25 mV/pCO2（mbar）=0.61 pH/pCO2（mbar），且线性度为0.9839。因此，所研制的基于PANI的石墨pH电极可应用于生物冶金中pH和CO2的检测中。In this study,polyaniline（ PANI） modified graphite pH electrode has been developed and investigated,and proved to be successfully used in carbon dioxide（ CO2 ） sensing. The electropolymerisation of PANI was carried out on the graphite electrode by Cyclic voltammetry method in hydrochloric acid aniline solution. It’s found that the PANI modified pH electrode showed super-Nernstain pH reponse in pH 1 ~pH 12 range：-63 . 80 mV/pH （ T=23 ℃）,-65. 81 mV/pH（T=48℃）. In addition,its response in strong acid solutions（pH 1~pH 3）was studied in detail,which showed -41.68 mV/pH（T=23 ℃）and -86. 12 mV/pH（T=48 ℃）pH sensitivity,thus could be used in bioleaching system. This PANI modified pH electrode was then applied into CO2 sensing according to the Severinghaus principle. This CO2 electrode exhibited good potentiometric properties（ linear range：0~1 000 mbar, sensitivity：42. 25 mV/pCO2（mbar）= 0. 61 pH/pCO2（mbar）,R2=0. 9839）. The PANI modified pH electrode could be used in pH and CO2 sensing in bioleaching system.

关 键 词：PH电极 聚苯胺 循环伏安法 CO2 检测 生物冶金 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]