Department of Analytical Chemistry, Faculty of Chemistry, University College of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran.
Department of Analytical Chemistry, Faculty of Chemistry, University College of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran.
Talanta. 2022 Jan 15;237:122895. doi: 10.1016/j.talanta.2021.122895. Epub 2021 Oct 2.
In this research, AgCl anchored graphitic carbon nitride (g-CN) was introduced as a novel potentiometric sensing element. A g-CN/AgCl-modified carbon paste electrode (CPE) was fabricated and used as an outstandingly selective potentiometric sensor to determine Cl in water samples. The g-CN/AgCl nanocomposite was characterized with SEM, XRD and FT-IR techniques. It was demonstrated that, the incorporation of 5% of g-CN/AgCl, as a chloride ionophore in a CPE, results in a stable potential response of the electrode to chloride ion. The Nernstian slope of the electrode response was 55.4 (±0.3) mVdecade, over a wide linear concentration range of 1 × 10-1 × 10 mol L and the detection limit of the electrode was estimated to be 4.0 × 10 mol L. The g-CN/AgCl-modified CPE electrode provided fast response time and long-term stability (more than 2 months) while the potential interfering ions such as I, Br, and CN showed no significant effect on the potential response. Since these interfering ions affected the response of the CPE electrode, modified with AgCl, highlighting the interesting effect of g-CN on the sensor performance. This innovative electrode was shown to be a sensitive and accurate sensor for chloride ion content estimation in water samples.
在这项研究中，引入了 AgCl 锚定的石墨相氮化碳（g-CN）作为一种新型的电位传感元件。制备了一种 g-CN/AgCl 修饰的碳糊电极（CPE），并将其用作测定水样中 Cl 的出色选择性电位传感器。通过 SEM、XRD 和 FT-IR 技术对 g-CN/AgCl 纳米复合材料进行了表征。结果表明，在 CPE 中掺入 5%的 g-CN/AgCl 作为氯离子载体，可使电极对氯离子产生稳定的电位响应。电极响应的 Nernst 斜率为 55.4（±0.3）mV 每 decade，线性浓度范围较宽，为 1×10-1~1×10-5mol L，电极的检测限估计为 4.0×10-5mol L。g-CN/AgCl 修饰的 CPE 电极提供了快速的响应时间和长期稳定性（超过 2 个月），而 I、Br 和 CN 等潜在干扰离子对电位响应没有显著影响。由于这些干扰离子影响了 AgCl 修饰的 CPE 电极的响应，突出了 g-CN 对传感器性能的有趣影响。该创新电极被证明是一种用于水样中氯离子含量估计的灵敏且准确的传感器。
