Developed a high-performance sensor based on cumarin derivative for rapid and sensitive detection of palladium ion in organic wastewater.

[Display omitted] In this article, a series of coumarin derivative fluorescent probes have been synthesized, which can realize simple, rapid and sensitive detection of Pd²⁺. We tested the fluorescence properties of three fluorescent probes, (E)-N′-(((4-chloropyridin-2-yl) methylene)-7-(diethylamino)-2-oxo-2H-chromene-3-carbohy (CMDCC) has the better fluorescence properties and anti-interference ability. Then, CMDCC as the fluorescence probe for detection of Pd²⁺ was systematic studied. Under optimized conditions, this probe has a wide pH range, a lower detection limit (4.45 × 10⁻⁸ mol L^-1), and a faster response speed (3 min). In the Pd²⁺ concentration range of 0.1−5 μmol L^-1, the fluorescence intensity of this probe and concentration of Pd²⁺ show a good linear response. In this work, Pd²⁺ content in organic waste liquid was successfully detected and a standard addition test was also performed. The satisfactory recovery rate was obtained. Moreover, it can be observed with naked eyes that the palladium ion changes the solution color of CMDCC from green to red. This color change can easily be compared with other metal salts. It indicates that CMDCC can also detect Pd²⁺ by colorimetric method. Therefore, CMDCC should be used to rapidly, conveniently detect Pd²⁺ in environmental samples. [ABSTRACT FROM AUTHOR]