Co-reporter:Guo-Qiang Xiang, Yue Ren, Yin Xia, Wenjie Mao, Chao Fan, Si-Yu Guo, Pan-Pan Wang, Deng-Hui Yang, Lijun He, Xiuming Jiang
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2017 Volume 177(Volume 177) pp:
Publication Date(Web):15 April 2017
DOI:10.1016/j.saa.2017.01.049
•Carbon dots (CDs)-coated dual-emission silica nanoparticles were prepared.•Ratiometric fluorescence nanosensor for BPA based on CDs-coated dual-emission silica nanoparticles was developed.A simple and effective strategy for designing a ratiometric fluorescent nanosensor is described in this work. A carbon dots (CDs) based dual-emission nanosensor for Bisphenol A (BPA) was prepared by coating CDs on the surface of dye-doped silica nanoparticles. The fluorescence of dual-emission silica nanoparticles was quenched in hydrochloric acid by potassium bromate (KBrO3) oxidation; BPA inhibited KBrO3 oxidation, resulting in the ratiometric fluorescence response of dual-emission silica nanoparticles. Several important parameters affecting the performance of the nanosensor were investigated and optimized. The detection limit of this nanosensor was 0.80 ng mL− 1 with a linear range from 10 to 500 ng mL− 1. This was applied successfully to determine BPA in the leached solution of different plastic products with satisfactory results.Download high-res image (61KB)Download full-size image
Co-reporter:Guoqiang Xiang, Yulong Ma, Xiuming Jiang, Pu Mao
Talanta 2014 Volume 130() pp:192-197
Publication Date(Web):1 December 2014
DOI:10.1016/j.talanta.2014.07.003
•Assembling polyelectrolyte multilayers (PEMs) on the surface of magnetic silica.•Fast adsorption kinetics, high selectivity, and high adsorption capacity.•Simple, quick and selective method for Cu2+ extraction and determination.A novel magnetic silica sorbent with polyelectrolyte multilayers (PEMs) on its surface was prepared, and the sorbent was used for the magnetic solid phase extraction (MSPE) of trace Cu2+ in drinking water with flame atomic absorption spectrometry (FAAS) as the detector. The experimental parameters for the MSPE procedure, such as the pH, desorption conditions, ultrasonic time and co-existing ions effects, were investigated. The adsorption capacity of the new sorbent was 14.7 mg g−1 for Cu2+. The detection limit of the developed method was 0.23 ng mL−1 for Cu2+ with an enrichment factor of 95.7. The analytical data obtained from the certified reference water and rice samples were in good agreement with the certified values. This method was also successfully applied to the determination of trace Cu2+ in different food samples with satisfactory results.
