Affiliation:
1. School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, Shanxi Province, China
Abstract
In this work, fluorescent carbon quantum dots (CQDs) was prepared using natural on ions as carbon source with hydrothermal method and it was modified with polyethyleneimine (PEI). The properties of PEI modified CQDs (PEI-CQDs) were characterized by fluorescence, infrared spectroscopy
and ultraviolet method, the morphology characteristics of PEI-CQDs was observed by transmission electron microscope. The results shown that the fluorescence excitation and emission wavelength were at 340 nm/462 nm, respectively. The fluorescence quantum yield was 8.68%, the average diameter
of the PEI-CQDs was 2.82 nm. The infrared showed that the PEI-CQDs contained hydroxyl and amino groups on its surface. The Co2+ has selective quenching effects on fluorescence of PEICQDs, PEI-CQDs can be used for detection and analysis of Co2+ in samples. The limit of
detection and linear range of Co2+ using the PEI-CQDs as fluorescence probe are 0.048 μM and 0.05–11 μM, respectively. The recovery was in the range of 97.00–100.64%. Moreover, the PEI-CQDs are also successfully utilized for monitoring the Co2+
content of tap water.
Publisher
American Scientific Publishers
Subject
Condensed Matter Physics,General Materials Science,Biomedical Engineering,General Chemistry,Bioengineering
Cited by
1 articles.
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