期刊
ANALYTICA CHIMICA ACTA
卷 688, 期 2, 页码 203-207出版社
ELSEVIER
DOI: 10.1016/j.aca.2011.01.007
关键词
Catechol; Sensor; Palygorskite; Carbon paste electrode; Electrocatalysis
资金
- National Natural Science Foundation of China [20805021]
- Science & Technology Program of Changzhou [CQ20100004]
- Open Foundation of Key Lab of Analytical Chemistry for Life Science, Ministry of Education, Nanjing University [KLACLS1007]
A palygorskite-modified carbon paste electrode (CPE) was constructed using graphite powder mixed with palygorskite particles. Compared with the unmodified CPE. the resulting palygorskite-modified CPE remarkably increases the peak currents of catechol, and greatly lowers the peak potential separation. Therefore, the palygorskite exhibits catalytic activity to catechol and significantly improves the determining sensitivity. The electrocatalytic activity of palygorskite is attributed to its high adsorption capability and the OH groups on its surface, which plays an important role in the electron transfer between the modified CPE and the catechol in the solution. The sensor shows a linear response range between 5 and 100 mu M catechol with a correlation coefficient of 0.998. The detection limit was calculated as 0.57 mu M (s/n = 3). (C) 2011 Elsevier B.V. All rights reserved.
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