Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 608, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.125563
Keywords
Hydrogel; Carbon dots; Fluorescent; Heavy metal ions; Ions detection
Categories
Funding
- National Natural Science Foundation of China [21374078]
- Science and Technology Plans of Tianjin [15JCYBJC17900, 15PTSYJC00250, 17YFZCSF01230]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT-17R80]
- Program for Innovative Research Team in University of Tianjin [TD13-5044]
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The novel PNIPAAm-CD hydrogel prepared by copolymerizing PCDs and NIPAAm monomers exhibits good adsorption properties and stable fluorescence detection for Fe3+. It has the potential to be an effective portable platform with dual functions of visual detection and Fe3+ adsorption.
A novel PNIPAAm-CD hydrogel with good adsorption property and stable fluorescence detection for Fe3+ was prepared by copolymerizing PCDs with NIPAAm monomers. As a fluorescence probe, carbon quantum dots (CDs) were modified by glycidyl methacrylate (GMA) to obtain PCDs, which had double bond and could react with N isopropyl acrylamide to form hydrogel. The functionalization of the amine groups on the surface of the PCDs enables PNIPAAm-CD hydrogel also exhibits photoluminescence behavior. In addition, the PNIPAAm-CD hydrogels stably shows higher adsorption performance for Fe3+ than the pure PNIPAAm hydrogel. The honeycomb PNIPAAm-CD hydrogel had a good quenching response to metallic iron ions, and the detection limit was as low as 0.27 mu M in the range of 1 mu M(-1)mM. The results of adsorption isotherms and adsorption kinetics showed that the adsorption procedure of metal ions conforms to the pseudo-second-order model and langmuir model, respectively. The effective detection and the high adsorption of PNIPAAm-CD hydrogel for Fe3+ make it an effective portable platform potential, which has the dual functions of visual detection and adsorption of Fe3+.
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