多孔碳传感器的制备及对大气羟基自由基测定的研究  

Preparation of porous carbon-based sensor and study on its application in determination of atmospheric hydroxyl radical

作　　者：李瑞红 何伟迪 马尚荣 史高峰[1] 王国英[1] LI Rui-hong;HE Wei-di;MA Shang-rong;SHI Gao-feng;WANG Guo-ying(College of Petrochemical Technology,Lanzhou University of Technology,Lanzhou 730050,China;Environmental Protection Bureau of Jianchang County,Huludao 125300,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050 [2]建昌县环保局,辽宁葫芦岛125300

出　　处：《现代化工》2022年第2期247-252,共6页Modern Chemical Industry

摘　　要：选择4-羟基苯甲酸(4-HBA)和3,4-二羟基苯甲酸(3,4-DHBA)作为捕集剂和探针分子,采用化学活化法制备了玉米秸秆基生物多孔碳(PBC),并以此构建了多孔碳修饰电极(PBC/GCE),对修饰材料进行了表征,优化了富集时间、富集电位、缓冲溶液的pH等电化学条件。在最佳条件下,探针分子3,4-DHBA在50~850μmol/L浓度范围内显示出良好的线性关系,检测限为21.25μmol/L(S/N=3)。经验证,该方法成功应用于外场环境中OH·的检测。Corn straw-based porous biological carbon(PBC)is prepared via chemical activation method,and used to establish PBC modified electrodes by using 4-hydroxybenzoic acid as collectors and 3,4-dihydroxybenzoic acid(3,4-DHBA)as probe for detection.The modified material is characterized,and the electrochemical conditions such as enrichment time,enrichment potential and pH value of buffer solution are optimized.It is shown that under the best conditions,3,4-DHBA shows a good linear relationship in the concentration range of 50-850μmol·L^(-1),with a detection limit of 21.25μmol·L^(-1)(S/N=3).The method is proved to be successfully applied to the detection of OH·in the field environment.

关 键 词：大气羟基自由基 生物质多孔碳 修饰电极 3 4-二羟基苯甲酸 

分 类 号：X833[环境科学与工程—环境工程]