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With the extensive use of palladium derivatives in the industry, their environmental pollution has become more and more serious. Herein, allyl functionalized hydrazone 2D COFs (XB-COFs) were found for selective fluorescent detection of Pd2+ (detection concentration of 0.29 μM) in water. The stable structure of the hydrazone bond and the complexation ability of allyl to Pd2+ cause XB-COF to have a good fluorescence sensing effect in both acid and alkaline solutions, and its adsorption capacity for Pd2+ is up to 120 mg g–1. During the interaction between XB-COF and Pd2+, a part of Pd2+ can be reduced to Pd nanoparticles with a diameter of about 10 nm. A fluorescent test paper was prepared by the in situ growth of XB-COF onto a filter paper, which can realize visualization detection of Pd2+ in 10 s with the naked eye or under a 365 nm UV lamp. This is the first time a fluorescent test paper based on in the situ growth of COFs has been applied for the detection of heavy metal ions, which provides a new platform for the application of COF materials in the medical health field, food safety, and environmental protection.
Lü et al. (Mon,) studied this question.