School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430073, China.
College of Textile Garment, Southwest University, 400715, China.
Carbohydr Polym. 2022 Jul 15;288:119417. doi: 10.1016/j.carbpol.2022.119417. Epub 2022 Mar 28.
Fluorescent chitosan-based hydrogel for the selective detection and adsorption of Hg/Hg in aqueous environment was prepared through three-step synthesis strategy. NO-Boron-dipyrrolemethene (BODIPY) was prepared firstly, and then the -NO group was reduced to -NH group. Finally, the NH-BODIPY was introduced to chitosan by Schiff base formation reaction through bi-aldehyde. Eventually, fluorescent chitosan hydrogel was obtained. The as-prepared fluorescent hydrogel probe could detect Hg/Hg through PET mechanism with the detection limit of 0.3 μM. The recognition site which combines Hg/Hg is CN, it is just formed in the reaction with chitosan and the amino group on BODIPY. Adsorption capacity of the fluorescent hydrogel is 121 mg·g, which is almost seven times of the original chitosan. The isotherm and kinetics of Hg/Hg removal follows Langmuir isotherm and pseudo-second order kinetics, respectively. Besides, a series of fluorescent hydrogels were prepared to compare the elasticity, hydropHilicity, fluorescence intensity and adsorption capacity.
通过三步合成策略，制备了用于在水相环境中选择性检测和吸附 Hg/Hg 的荧光壳聚糖基水凝胶。首先制备了 NO-硼二吡咯甲川（BODIPY），然后将-NO 基团还原为-NH 基团。最后，通过席夫碱形成反应，将 NH-BODIPY 引入壳聚糖中，通过双醛。最终，得到了荧光壳聚糖水凝胶。所制备的荧光水凝胶探针可以通过 PET 机制检测 Hg/Hg，检测限为 0.3 μM。与壳聚糖和 BODIPY 上的氨基反应形成的结合 Hg/Hg 的识别位点是 CN。荧光水凝胶的吸附能力为 121mg·g，几乎是原始壳聚糖的七倍。Hg/Hg 的去除等温线和动力学分别遵循 Langmuir 等温线和拟二级动力学。此外，还制备了一系列荧光水凝胶来比较弹性、亲水性、荧光强度和吸附能力。
