基于氮掺杂碳材料光催化传感器对食品中重金属离子的检测

Detection of Heavy Metal Ions in Food Based on Nitrogen-Doped Carbon Material Photocatalytic Sensor

为克服当前食品重金属检测方法的不足,以食品中重金属Cu^(2+)检测为例,研究基于氮掺杂碳材料光催化传感器在食品中重金属离子检测中的应用。本文论述氮掺杂碳点的制备方法,探究氮掺杂碳点浓度、检测时间对Cu^(2+)检测效果及其荧光强度的影响;以Mg^(2+)、Hg^(2+)、Ca^(2+)、Fe^(3+)、Zn^(2+)、Ni^(2+)、Ba^(2+)、Pb^(2+)、Cd^(2+)和Mn^(2+)10种金属离子为干扰物,分析氮掺杂碳点检测法对Cu^(2+)的选择特异性。结果表明,氮掺杂碳材料光催化传感器可实现室温下对Cu^(2+)的即时检测,且具有检测灵敏度高(检出限Cu^(2+)为5.26 μmol·L^(-1))、抗干扰性强、检测要求低等特点,在食品铜污染检测、铜污染治理方面具有较强的应用价值。

To address the limitations of current heavy metal detection methods in food,this paper exemplifies the detection of copper ions(Cu^(2+))in food using a nitrogen-doped carbon material photocatalytic sensor.In this paper,the preparation method of nitrogen-doped carbon dots is discussed,and the impact of nitrogen-doped carbon dot concentration and detection time on the detection efficiency and fluorescence intensity for Cu^(2+)is explored.The selectivity of this detection approach is analyzed with ten interfering metal ions:Mg^(2+),Hg^(2+),Ca^(2+),Fe^(3+),Zn^(2+),Ni^(2+),Ba^(2+),Pb^(2+),Cd^(2+)and Mn^(2+).The results show that the nitrogen-doped carbon material photocatalytic sensor enables instantaneous detection of Cu^(2+)at room temperature,and has the characteristics of high sensitivity(detection limit for Cu^(2+)is 5.26μmol·L^(-1)),strong anti-interference capability,and low detection requirements,which has significant application value in detecting and controlling copper pollution in food.