Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 198, Issue -, Pages 194-203Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.12.075
Keywords
Chitosan based sensor; -NH2/C Xi; Heavy metal ion detection
Funding
- National Natural Science Foundation of China (NSFC) [41573106]
- China-Romania bilateral research collaboration project of the Ministry of Science and Technology of the People's Republic of China [43-12]
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In this study, fluorescent small molecule BODIPY and chitosan-based polymer sensors were synthesized, which can effectively detect and quench Hg2+, Hg+, Fe3+, and Fe2+. These sensors also have the ability to remove heavy metal ions.
The detection of heavy metals, such as Hg2+ and Fe3+, is of great significance. In this work, fluorescent small molecule BODIPY (BY-3) bearing C=C group was synthesized firstly. And then, the chitosan-based polymer sensor CY-1 was synthesized through the spontaneous NH2/C equivalent to C click reaction. The synthesized CY-1 can effectively bind and recognize Hg2+/Hg+ by the -C=N groups formed in the click reaction. Moreover, the macromolecular sensors CS-1 and CS-2 were synthesized by incorporating another recognition sites to CY-1. These synthesized macromolecular sensors can not only recognize Hg2+/Hg+, but also effectively recognize Fe3+/Fe2+. All of them exhibited significant quenching effect, visible to the naked eye under UV irradiation. The detection limit of CY-1 for Hg2+ was 1.51 x 10(-6) mol/L, and the detection limit of CS-2 for Fe3+ was 2.30 x 10(-6) mol/L. The BODIPY-chitosan sensors synthesized in this work have the functions of removing heavy metal ions besides the identifying ability. The maximum adsorption capacity of 1 g chitosan to Hg2+ was 108 mg as the best one. This article provides a new method to prepare macromolecular sensors for the detection and removal of heavy metal ions. As a useful natural polymer, chitosan's application scope was enlarged.
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