In this study, blue-emission
carbon dots were prepared from the
legumes of the vegetable Pisum sativum Linn. by one-step carbonization. The fluorescence of a carbon dot
(CDs) solution can be quenched by copper ions and recovered by ethylenediaminetetraacetic
acid (EDTA). In addition, two kinds of visual fluorescent filter papers
were prepared. Finally, a dual-mode fluorescence and visual fluorescent
test paper was employed for the detection of copper ions and EDTA.
The simple synthesis method and the high safety enable this material
to have more application possibilities.