Sensitive fluorescent probe based on combination of magnetic molecularly imprinted materials and carbon dots derived from prussian blue for p-aminoazobenzene in environmental samples

In this work, an effective fluorescent probe for analysis of p-aminoazobenzene (p-AZO) was established with carbon dots (CDs) and magnetic molecularly imprinted nanomaterial, in which CDs and the magnetic nanomaterial were simultaneously derived from prussian blue (PB) by one-pot hydrothermal method. The sensitivity of the constructed probe is greatly improved owing to the introduction of magnetic solid phase extraction. Factors affecting the enrichment efficiency and detection performance of p-AZO were optimized. Under optimal conditions, the probe exhibited good selectivity and sensitivity for p-AZO. Good linearity was achieved in the range of 2-600 nmol L-1. Low detection limit for p-AZO was 1 nmol L-1. Satisfactory recoveries in the range of 95.8-98.7% were obtained at two spiked concentrations of 0.02 and 0.1 mu mol L-1, indicating that the probe established with CDs and MMIPs based MSPE was reliable and robust for determination of p-AZO in real water samples.