Xu Yi, Wang Haiping, Bai Qingyan, Li Weiyan, Ma Shujuan, Bo Chunmiao, Ou Junjie
School of Chemistry and Chemical Engineering, Ningxia Key Laboratory of Solar Chemical Conversion Technology, Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, 750021, China.
CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
Mikrochim Acta. 2024 Sep 29;191(10):632. doi: 10.1007/s00604-024-06714-5.
A novel kind of carbon dot (CD) was prepared by one-step hydrothermal microwave assisted method using L-tryptophan and L-tartaric acid as raw materials. Monodisperse poly(glycidyl methacrylate-co-ethylene glycol dimethacrylate) microspheres were utilized as the matrix, with praseodymium (Pr) ion (Pr) as the template, methacrylic acid as the functional monomer, and 5-amino-8-hydroxyquinoline (5-AHQ) acts as the ligand. A composite microsphere of ion-imprinted polymer (IIP) and CD (noted CD@IIP) was prepared by surface-initiated atom transfer radical polymerization (SI-ATRP). For comparison, IIP without CD (Pr-IIP) and non-imprinted polymer (NIP) were also prepared. Through static adsorption experiments, it was determined that the saturated adsorption amount of CD@IIP is 47.19 mg g, that of Pr-IIP is 54.49 mg g, while that of NIP is only 24.32 mg g. Dynamic adsorption experiments showed that the equilibrium of three kinds of materials was reached within 30 min. Particularly, CD@IIP could emit two fluorescence peaks at 325 nm and 421 nm under ultraviolet irradiation, and exhibited excellent selectivity and fluorescence quenching effect on Pr. The fluorescence response of Pr in the range 0-400 μmol L was determined by ratiometric fluorescence method, offering a two-stage model and robust linear regression coefficient. These results demonstrated that CD@IIP exhibited selective adsorption ability for Pr, and a sensitive, rapid and simple method for detection of Pr was successfully developed.
以L-色氨酸和L-酒石酸为原料，通过一步水热微波辅助法制备了一种新型碳点（CD）。以单分散聚（甲基丙烯酸缩水甘油酯-共-乙二醇二甲基丙烯酸酯）微球为基质，以镨（Pr）离子为模板，甲基丙烯酸为功能单体，5-氨基-8-羟基喹啉（5-AHQ）为配体。通过表面引发原子转移自由基聚合（SI-ATRP）制备了离子印迹聚合物（IIP）与CD的复合微球（记为CD@IIP）。为作比较，还制备了不含CD的IIP（Pr-IIP）和非印迹聚合物（NIP）。通过静态吸附实验测定，CD@IIP的饱和吸附量为47.19 mg/g，Pr-IIP的饱和吸附量为54.49 mg/g，而NIP的饱和吸附量仅为24.32 mg/g。动态吸附实验表明，三种材料在30分钟内达到平衡。特别地，CD@IIP在紫外光照射下可在325 nm和421 nm处发射两个荧光峰，对Pr表现出优异的选择性和荧光猝灭效果。采用比率荧光法测定了0-400 μmol/L范围内Pr的荧光响应，给出了一个两阶段模型和稳健的线性回归系数。这些结果表明，CD@IIP对Pr具有选择性吸附能力，并成功开发了一种灵敏、快速且简单的Pr检测方法。
