Tb(III)-functionalized covalent organic framework for fluorescence detection of sodium dehydroacetate, 2-methoxyaceticacid and mesotrione and adsorption application

Hazardous substances are often found in various forms in different environments, so testing for different types of hazardous substances is necessary. In particular, the removal of pollutants from the water environment is also of great interest. In this study, TGH+-PD@Tb (1@Tb) is successfully prepared for the fluorescence detection of sodium dehydroacetate (NADH) by "turn-on" mode. Continuously, the selective fluorescence detections of 2-methoxyaceticacid (Maa) and mesotrione (MST) are accomplished using the solution (1@Tb@NADH) with green fluorescence by "turn-off" mode. In deionized water, the limits of detection of NADH, Maa and MST are 1.8 μM, 0.10 μM and 0.046 μM, respectively. Meanwhile, based on selectivity and anti-interference experiments, 1@Tb and 1@Tb@NADH maintain the ability to detect NADH, Maa and MST in their own environments of existence (bread, serum and lake water). In further exploration of the mechanism, we find that the three substrates exhibited different response mechanisms, namely antenna effect of NADH, photoinduced electron transfer (PET) of Maa, and inner filter effect (IFE) of MST. Additionally, 1@Tb also shows good adsorption effect for MST, and the maximum adsorption capacity is 470.8 mg/g, providing reference value for MST removal from lake water.