Considering the high toxicity of cationic dyes to the environment and humans, the development of materials which possessed the function both of detection and adsorption of cationic dyes are of great significance. In this study, a novel glutathione (GSH)-functionalized highly crystalline fluorescent covalent organic framework (denoted as COF-TPDD-COOH), which can act as a fluorescence-sensing and adsorption double platform for cationic dyes, was fabricated reported for the first time. To effectively postsynthetically modification and form COF-TPDD-COOH, a fluorescent COF (namely COF-TPDD) with a high crystallinity was fabricated by optimizing a series of conditions affecting crystallinity. The as-prepared COF-TPDD-COOH exhibited good dispersion and outstanding fluorescence and adsorption performances, which yielded remarkable performances in the detection and enrichment of cationic dyes (malachite green, methylene blue and crystal violet). Low detection limits (LODs, 0.003–0.007 μg·mL⁻¹) and high adsorption capacities (88.02–128.64 mg·g⁻¹) were obtained for three cationic dyes. The introduction of GSH increased the possibility of COF-TPDD-COOH binding with cationic dyes, which further increased the enrichment effect of cationic dyes. After adsorption, the cationic dyes could more easily interact with COF-TPDD-COOH and capture the protons needed for fluorescence, thus destroying the excited-state intramolecular proton transfer effect and selectively quench the fluorescence. A sensing platform based on COF-TPDD-COOH was developed and applied for the detection and adsorption of three cationic dyes from real samples.

考虑到阳离子染料对环境和人体的高毒性，开发兼具检测和吸附阳离子染料功能的材料具有重要意义。在这项研究中，首次报道了一种新型谷胱甘肽（GSH）功能化的高结晶荧光共价有机框架（表示为COF-TPDD-COOH），它可以作为阳离子染料的荧光传感和吸附双平台。时间。为了有效地进行后合成修饰并形成COF-TPDD-COOH，通过优化一系列影响结晶度的条件，制备了具有高结晶度的荧光COF（即COF-TPDD）。所制备的COF-TPDD-COOH表现出良好的分散性和优异的荧光和吸附性能，在阳离子染料（孔雀石绿、亚甲蓝和结晶紫）的检测和富集方面取得了显着的效果。低检测限（LOD，0.003–0.007 μg·mL^-1 ) 和高吸附容量 (88.02–128.64 mg·g ^-1 ) 获得了三种阳离子染料。GSH的引入增加了COF-TPDD-COOH与阳离子染料结合的可能性，进一步提高了阳离子染料的富集效果。吸附后的阳离子染料更容易与COF-TPDD-COOH相互作用，捕获荧光所需的质子，从而破坏激发态分子内质子转移效应，选择性猝灭荧光。开发了一种基于COF-TPDD-COOH的传感平台，并将其应用于真实样品中三种阳离子染料的检测和吸附。