The invention discloses a method for synthesizing carbon dots and detecting
copper ions in a
water body, and relates to the technical field of
carbon dot synthesis, and the method is technically characterized by comprising the following steps: synthesizing fluorescent carbon dots by taking tea as a
raw material and adopting a hydrothermal method, and optimizing synthesis conditions; with the synthesized fluorescent carbon dots as probes and by means of the
fluorescence of the carbon dots, detecting
copper ions in the
water body, opetimizing the conditions for detecting the
copper ions, and detecting the Cu<2+> in the
water body by virtue of a
linear relationship between the
fluorescence intensity of the fluorescent carbon dots and the Cu<2+> concentration. According to the preparation method, the tea is taken as a
raw material, the fluorescent carbon dots are synthesized by adopting a hydrothermal method, and synthesis conditions are optimized, so that the preparation operation of the carbon dots is simple, the preparation efficiency is high, and meanwhile, the synthesized carbon dots are good in
fluorescence property,
photobleaching resistance and
salt resistance; and besides, the synthesized fluorescent carbon dots are used for detecting Cu<2+> in a water body, Cu<2+> in the water body is detected by utilizing a fluorescence spectrophotometric method, the detection sensitivity is high, the selectivity is good, and simple and
rapid detection of heavy
metal ions in an
environmental water sample can be realized.