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Open AccessArticle

Preparation of “Ion-Imprinting” Difunctional Magnetic Fluorescent Nanohybrid and Its Application to Detect Cadmium Ions

by Lina Chen 1,2,3, Yue Lu 4, Minshu Qin 1,2,3, Fa Liu 1,2,3, Liang Huang 5, Jing Wang 5, Hui Xu 4, Na Li 1,2,3, Guobao Huang 1,2,3, Zhihui Luo 1,2,3,* and Baodong Zheng 4,*
Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology, Yulin 537000, China
Colleges and Universities Key Laboratory for Efficient Use of Agricultural Resources in the Southeast of Guangxi, Yulin 537000, China
College of Chemistry and Food Science, Yulin Normal University, Yulin 537000, China
Engineering Research Center of Marine Living Resources Integrated Processing and Safety Risk Assessment, College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China
College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
Authors to whom correspondence should be addressed.
Sensors 2020, 20(4), 995;
Received: 18 December 2019 / Revised: 9 February 2020 / Accepted: 10 February 2020 / Published: 13 February 2020
(This article belongs to the Section Chemical Sensors)
In this work, we have fabricated a novel difunctional magnetic fluorescent nanohybrid (DMFN) for the determination of cadmium ions (Cd2+) in water samples, where the “off-on” model and “ion-imprinting” technique were incorporated simultaneously. The DMFN were composed of CdTe/CdS core-shell quantum dots (QD) covalently linked onto the surface of polystyrene magnetic microspheres (PMM) and characterized using ultraviolet-visible spectroscopy (UV-Vis), fluorescence spectroscopy, and transmission electron microscopy (TEM). Based on the favorable magnetic and fluorescent properties of the DMFN, the chemical etching of ethylene diamine tetraacetic acid (EDTA) at the surface produced specific Cd2+ recognition sites and quenched the red fluorescence of outer CdTe/CdS QD. Under optimal determination conditions, such as EDTA concentration, pH, and interfering ions, the working curve of determining Cd2+ was obtained; the equation was obtained Y = 34,759X + 254,894 (R = 0.9863) with a line range 0.05–8 μM, and the detection limit was 0.01 μM. Results showed that synthesized magnetic fluorescent microspheres had high sensitivity, selectivity, and reusability in detection. Moreover, they have significant potential value in fields such as biomedicine, analytical chemistry, ion detection, and fluorescence labeling. View Full-Text
Keywords: bifunctional; magnetic; fluorescent; Cd2+; detection; ion-imprinting bifunctional; magnetic; fluorescent; Cd2+; detection; ion-imprinting
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Chen, L.; Lu, Y.; Qin, M.; Liu, F.; Huang, L.; Wang, J.; Xu, H.; Li, N.; Huang, G.; Luo, Z.; Zheng, B. Preparation of “Ion-Imprinting” Difunctional Magnetic Fluorescent Nanohybrid and Its Application to Detect Cadmium Ions. Sensors 2020, 20, 995.

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