摘要
首先用显色剂5-(5-溴-2-吡啶偶氮)-2,4-二氨基甲苯(5-Br-PADAT)在pH=4.5的乙酸-乙酸钠缓冲溶液中"钓"Co2+,将生成的Co2+-5-Br-PADAT修饰在氧化铟锡(ITO)玻璃电极上,然后采用电沉积法将其还原制备成纳米钴/ITO修饰电极。基于此,构置出一种准确性高、灵敏度好的测定水合肼的电化学传感器,并建立了测定肼的新分析方法。结果表明,制备的Co2+-5-Br-PADAT络合物可以稳定存在,运用电化学方法还原的纳米钴通过扫描电镜鉴定为球状颗粒,催化结果显示纳米钴对水合肼具有良好的催化作用,且加入显色剂构置的传感器的性能显著优于无显色剂的情况。将该传感器用于模拟水样中水合肼的测定,相对回收率达95%~105%,可以满足环境体系中微量组分的测定。
A new chromogenic agent 5-(5-bromine-2-pyridylazo)-2,4-diaminotoluene was used to capture cobalt ions in the acetic acid-sodium acetate buffer at pH=4.50,and then modified on the ITO glass electrode.The nanocobalt/ITO modified electrode was prepared by reducing through the electrodeposition method.Based on this principle to design of a electrochemical sensor with high accuracy,high sensitivity for the determination of hydrazine.The results indicated that:the complexes formed by the reaction of 5-Br-PADAT with cobalt ions in the acetic acid-sodium acetate buffer at pH=4.50 can be stably present,and the nano-cobalt reduced by electrochemical method was identified as spherical particles by scanning electron microscopy.It shown that nano-cobalt had a good catalytic effect on hydrazine hydrate,and the performance of the sensor was significantly better than that without it.This sensor was used to simulate the determination of hydrazine hydrate in water samples.The recovery rate was between 95%and 105%,which can meet the determination of trace components in environmental system.
作者
何亚萍
陈雯婕
韩权
武江艳
杨晓慧
霍燕燕
He Yaping;Chen Wenjie;Han Quan;Wu Jiangyan;Yang Xiaohui;Huo Yanyan(Department of Chemical Engineering,Xi'an University,Xi'an 710065;School of Chemistry and Chemical Engineering,Yan'an University,Yan'an 716000)
出处
《化工新型材料》
CAS
CSCD
北大核心
2020年第2期272-275,共4页
New Chemical Materials
基金
陕西省创新能力支撑计划(2018KJXX-090)
国家自然科学基金(21445004、21545014、21643014)
西安市科技计划项目(CXY1531WL22、2016CXWL09、2016CXWL18、2019KJWL13)
陕西省大学生创新创业训练计划项目(201611080008、201613)
陕西省教育厅重点实验室访问学者项目(14JS095)
西安文理学院博士启动基金(06005017)
陕西省分析化学重点学科资助(09009001).
