Ghrkhlari S, Ahour Fatemeh, Keshipour S
Department of Nanotechnology, Faculty of Chemistry, Urmia University, Urmia, Iran.
Nanotechnology Research Center, Urmia University, Urmia, Iran.
Sci Rep. 2025 Jan 2;15(1):441. doi: 10.1038/s41598-024-84185-7.
In the present work, nitrogen-doped carbon was synthesized starting from a chitosan/urea mixture and immobilized at the surface of a bare glassy carbon electrode to detect Cd(II) ions using differential pulse-anodic stripping voltammetry method (DP-ASV). The synthesized nitrogen-doped carbon showed a significant potential for determining Cd(II) ions. Doping carbon with nitrogen atoms gives a structure with increased valence band energy, leading to acceleration of the electron transfer by creating an interaction of nitrogen's free electrons with Cd(II), which subsequently increases the peak current value. After the characterization of nitrogen-doped carbon by various methods, cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to study the prepared sensor's electrochemical behavior. Under optimal conditions, the proposed sensor has a linear response of 3.0 to 150 nM and its detection limit is 2.0 nM. This sensor can analyze Cd(II) in tap and river water as real samples.
在本工作中，从壳聚糖/尿素混合物出发合成了氮掺杂碳，并将其固定在裸玻碳电极表面，采用差分脉冲阳极溶出伏安法（DP - ASV）检测Cd(II)离子。合成的氮掺杂碳在测定Cd(II)离子方面显示出巨大潜力。用氮原子掺杂碳会使结构的价带能量增加，通过氮的自由电子与Cd(II)产生相互作用，从而加速电子转移，进而增加峰值电流值。在用各种方法对氮掺杂碳进行表征之后，采用循环伏安法（CV）和差分脉冲伏安法（DPV）研究了制备的传感器的电化学行为。在最佳条件下，所提出的传感器具有3.0至150 nM的线性响应，其检测限为2.0 nM。该传感器可对自来水和河水等实际样品中的Cd(II)进行分析。
