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The well-dispersive and superparamagnetic Fe3O4-nanocrystals (Fe3O4-NCs) which could significantly enhance the anodic electrochemiluminescence (ECL) behavior of luminol, were synthesized in this study. Compared to ZnS, ZnSe, CdS and CdTe nanoparticles, the strongest anodic ECL signals were obtained at +1.6 V on the Fe3O4-NCs coated glassy carbon electrode. The ECL spectra revealed that the strong ECL resonance energy transfer occurred between luminol and Fe3O4-NCs. Furthermore, under the optimized ECL experimental conditions, such as the amount of Fe3O4-NCs, the concentration of luminol and the pH of supporting electrolyte, BPA exhibited a stronger distinct ECL quenching effect than its structural analogs and a highly selective and sensitive ECL sensor for the determination of bisphenol A (BPA) was developed based on the Fe3O4-NCs. A good linear relationship was found between the ECL intensity and the increased BPA concentration within 0.01–5.0 mg/L, with a correlation coefficient of 0.9972. The detection limit was 0.66 × 10−3 mg/L. Good recoveries between 96.0% and 105.0% with a relative standard deviation of less than 4.8% were obtained in real water samples. The proposed ECL sensor can be successfully employed to BPA detection in environmental aqueous samples.

• A novel MIP-Fe 3 O 4 -NCs with specific recognition sites to BPA was fabricated. • The MIP-Fe 3 O 4 -NCs/GCE could promote the cathodic ECL of luminol and specifically rebind BPA. • The ECL quenching property of MIP-Fe 3 O 4 -NCs was the electron transfer hindrance after BPA adding. • The MIECL sensor for BPA determination in seawater and fish samples were developed. A highly selective molecularly imprinted electrochemiluminescence (MIECL) sensor based on molecularly imprinted Fe 3 O 4 nanocrystals (MIP-Fe 3 O 4 /NCs) and luminol was developed for bisphenol A (BPA) determination. MIP-Fe 3 O 4 -NCs were synthesized and immobilized on the glassy carbon electrode (GCE) surface to fabricate the electrogenerated chemiluminescence (ECL) system. The GCE modified with MIP-Fe 3 O 4 -NCs could greatly promote the cathodic ECL of luminol. After incubation with the BPA solution, the imprinting sites on the surface of MIP-Fe 3 O 4 -NCs could specifically rebind BPA, resulting in selective and sensitive ECL quenching by hindering electron transfer capability. Under optimal conditions, the relative ECL intensities were proportional to the logarithm of BPA concentration ranging from 0.002 μg/L to 5.0 × 103 μg/L at a limit of detection of 2.0 × 10−4 μg/L. Satisfactory recoveries of 93.5 %–98.3 % were obtained in fish and seawater samples at a relative standard deviation of <6.1 %. The proposed MIECL sensor displayed good selectivity, high sensitivity, and excellent accuracy and precision. The results demonstrated the potential application of the MIECL sensor for BPA analysis in actual samples and for pollutant analysis. [ABSTRACT FROM AUTHOR]

The well-dispersive and superparamagnetic Fe3O4-nanocrystals (Fe3O4-NCs) which could significantly enhance the anodic electrochemiluminescence (ECL) behavior of luminol, were synthesized in this study. Compared to ZnS, ZnSe, CdS and CdTe nanoparticles, the strongest anodic ECL signals were obtained at +1.6 V on the Fe3O4-NCs coated glassy carbon electrode. The ECL spectra revealed that the strong ECL resonance energy transfer occurred between luminol and Fe3O4-NCs. Furthermore, under the optimized ECL experimental conditions, such as the amount of Fe3O4-NCs, the concentration of luminol and the pH of supporting electrolyte, BPA exhibited a stronger distinct ECL quenching effect than its structural analogs and a highly selective and sensitive ECL sensor for the determination of bisphenol A (BPA) was developed based on the Fe3O4-NCs. A good linear relationship was found between the ECL intensity and the increased BPA concentration within 0.01–5.0 mg/L, with a correlation coefficient of 0.9972. The detection limit was 0.66 × 10−3 mg/L. Good recoveries between 96.0% and 105.0% with a relative standard deviation of less than 4.8% were obtained in real water samples. The proposed ECL sensor can be successfully employed to BPA detection in environmental aqueous samples. [ABSTRACT FROM AUTHOR]