4.2 Article

The Influence of pH on Electrochemical Behavior of Nicotine-Clay based Electrodes

期刊

SCIENCE OF SINTERING
卷 53, 期 4, 页码 535-548

出版社

INT INST SCIENCE SINTERING (I I S S)
DOI: 10.2298/SOS2104535J

关键词

Nicotine; Montmorillonite; Cyclic voltammetry; Electrochemical impedance spectroscopy; Ferrocyanide probe

资金

  1. Ministry of Education, Science and Technological Development of the Republic of Serbia [451-03-9/2021-14/200026]

向作者/读者索取更多资源

Montmorillonite clay, whether untreated or acid activated, efficiently adsorbs nicotine from aqueous solutions at different pH levels. Electrochemical studies show that nicotine-modified untreated clay exhibits enhanced response compared to clay without nicotine, while acid activated clay with adsorbed nicotine shows lower electrode activity. pH and clay treatment do not significantly affect the electrochemical oxidation of nicotine.
Montmorillonite based clay was acid activated. Nicotine was adsorbed on untreated and acid activated clay from its aqueous solution at either pH=6 or pH=9.26 (unadjusted pH solution). The XRD analysis revealed that the 001 basal spacing of montmorillonite after nicotine adsorption was around 1.38 nm, regardless of clay treatment or pH of adsorption. The obtained values for basal spacing indicate that nicotine is in monolayer arrangement. In order to investigate electrochemical properties, untreated and acid activated clay, with and without nicotine, were used as modifier of carbon paste electrode. Cyclic voltammetry and electrochemical impedance spectroscopy were employed to study electrochemical response of clay-modified electrodes toward ferrocyanide probe. The nicotine-modified untreated clay used as paste electrode showed enhanced electrochemical response toward ferrocyanide probe in comparison to electrode based on clay without nicotine. On the other hand, adsorbed nicotine on acid activate clay resulted in lower electrode activity. Electrochemical response of adsorbed nicotine was studied at different pH. Nicotine oxidation at each of investigated samples followed the same trend regardless of clay treatment or pH at which adsorption was performed. For all samples, nicotine oxidation peak potential showed linear dependence on pH in pH range from 3.7 to 9.0, with slopes close to the value of 59 mVdec(-1) expected for equal number of protons and electrons involved in the reaction. The nicotine reduction process was best resolved at pH = 1 at potential around -1.35 V, while the following cathodic wave observed at potential around-1.5 V was ascribed to the cathodic hydrogen reduction. Mechanism of electrochemical oxidation was not influenced by pH of adsorption, i.e., nicotine form. The amount of adsorbed nicotine was not correlated with the electrochemical activity suggesting that only small number of adsorbed nicotine was involved in electrochemical response.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.2
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据