基于g-C_(3)N_(4)纳米片/氧化石墨烯复合材料电化学传感器检测水体中左氧氟沙星研究

Electrochemical detection of levofloxacin based on g-C_(3)N_(4) nanosheets/graphene oxide composite in water

近年来,随着抗生素的滥用和不加控制的排放,水体中抗生素的检测已经成为环境分析的一个重要研究领域.本文采用简单的超声方法将超薄石墨相氮化碳纳米片(g-C_(3)N_(4)Ns)固定在氧化石墨烯(GO)的表面,形成g-C_(3)N_(4)Ns/GO纳米复合材料,制备了一种基于石墨相氮化碳/氧化石墨烯的新型电化学传感器,用于环境水样中左氧氟沙星(LEV)的检测.在优化的实验条件下,利用差分脉冲伏安法(DPV)对LEV进行检测,线性范围为0.25~90μmol·L^(-1),检出限为0.073μmol·L^(-1).该传感器具有良好的稳定性、灵敏度、抗干扰能力和制备简单等优势,并成功地用于测定河水和自来水样中的LEV,具有良好的回收率,为左氧氟沙星的灵敏检测提供了一种可行的方案.

In recent years,with the abuse and uncontrolled discharge of antibiotics,the detection of antibiotics has become a momentous research field of environmental analysis in water.In this paper,an ultra-thin graphite phase carbon nitride nanosheets(g-C_(3)N_(4)Ns) were immobilized onto the surface of graphene oxide(GO)by simple ultrasonic method to form g-C_(3)N_(4)Ns/GO nanocomposite.A novel electrochemical sensor based on graphite phase carbon nitride/graphene oxide was constructed for the detection of levofloxacin(LEV)in sample of environmental water.Under optimized experimental conditions,the sensor was used to detect LEV by using differential pulse voltammetry(DPV),with a linear range of 0.25~90 μmol·L^(-1) and a detection limit of 0.073 μmol·L^(-1).The sensor had the advantages of good stability,satisfactory sensitivity,anti-interference ability and simple preparation,and had been successfully used in the determination of LEV in river water and tap water samples with good recovery rate.It provided a feasible scheme for the sensitive detection of levofloxacin.