Cadmium (II) ion detection method based on composite material modified electrode and application

The invention discloses a cadmium (II) ion detection method based on a composite material modified electrode and application, and belongs to the technical field of water quality detection. A glassy carbon electrode (GCE) is modified by preparing a polyaniline coated graphite phase carbon nitride (PANI (at) g-C3N4) compound, so that PANI (at) g-C3N4 (at) GCE is prepared, and the prepared PANI (at) g-C3N4 (at) GCE is used as a working electrode for detecting cadmium (II) ions in a water environment; compared with the existing design, the PANI (at) g-C3N4 (at) GCE provided by the invention has a relatively low detection limit and a relatively wide linear range, and also has better anti-interference performance, reproducibility and stability; when the method is used for detecting an actual water sample, the relative standard deviation is small, the measurement is accurate, and the reliability is high; meanwhile, a device-based sensor is provided based on PANI (at) g-C3N4 (at) GCE, compared with a conventional sys