萘胺改性碳量子点的制备及降解有机污染物的研究

Preparation of naphthylamine modified carbon quantum dots for degradation of organic pollutants

利用萘胺(NA)与碳量子点(CQDs)表面的羰基(C==O)发生席夫碱缩合反应制备萘胺改性碳量子点(CQDs-NA),考察了在可见光照射下其降解有机污染物的性能。结果表明,在1 h内罗丹明B(Rh B)去除率高达95%。CQDs-NA/过单氧硫酸盐(PMS)/有光(Light)体系的主要活性物种是超氧自由基(O_(2)·-),O_(2)·-与空穴(h+)共同作用可降解Rh B。NA的引入增强了可见光吸收范围,有效地调整了CQDs电子结构,促进了光生电子-空穴对的分离,从而提高了光催化能力。该研究为高效光催化剂的设计合成提供参考。

Naphthylamine modified carbon quantum dots(CQDs-NA)are prepared via the Schiff base condensation reaction by making use of the reaction between naphthylamine and carbonyl(C==O)on the surface of CQDs,and their performance is evaluated in the degradation of organic pollutants under visible light irradiation.Experimental results show that the removal rate of rhodamine B over the prepared CQDs-NA reaches 95%within 1 h.It is shown by free radical quenching experiments that the main active species of CQDs-NA/PMS/Light system include superoxide radical(O_(2)·~-),which acts together with h~+to degrade rhodamine B.It is verified through DFT study that the addition of NA enhances the visible light absorption range,adjusts effectively the electronic structure of CQDs and facilitates the separation of photogenerated electron-hole pairs,thus improving the photocatalytic ability.This study provides a reference for the design and synthesis of efficient photocatalysts.