Synthesis of fluorescent carbon quantum dots from aqua mesophase pitch and their photocatalytic degradation activity of organic dyes  

作　　者：Youliang Cheng Mengsha Bai Jian Su Changqing Fang Hang Li Jing Chen Jieming Jiao 

机构地区：[1]Faculty of Printing,Packaging Engineering and Digital Media Technology,Xi’an University of Technology

出　　处：《Journal of Materials Science & Technology》2019年第8期1515-1522,共8页材料科学技术（英文版）

基　　金：supported by the fund of the Beijing Laboratory for Food Quality and Safety, Beijing Technology and Business University (Grant No. FQS-201709);China Postdoctoral Science Foundation Funded Project (Grant No. 2016M592824);the Science and Technology Plan of Yulin City (Grant No. 2016-16-7);the Science and Technology Plan of Beilin District (Grant No. GX1710)

摘　　要：A synthesis strategy of fluorescent carbon quantum dots(CQDs) with high quantum yield(QY) using aqua mesophase pitch(AMP) as the carbon source has been developed via the hydrothermal method in this study. The hydrothermal temperature and soaking time have important effects on the morphology and QY of CQDs. As-prepared CQDs at 120℃ holding for 24 h(CQDs-120-24) have the uniform size of about 2.8 nm, and the QY can reach 27.6%. The obtained CQDs are successfully modified with ammonia and thionyl chloride, respectively, and they exhibit an excellent photocatalytic performance on degrading rhodamine B(Rh B), methyl blue(MB) and indigo carmine(IC). Importantly, the degradation percentage of N-CQDs on Rh B under natural light for 4 h reaches 97% with the degradation rate constant of 0.02463 min^(-1) and it can maintain 93% after repetitively used 5 times. The results indicate that these as-prepared CQDs have the potential application in degrading organic dyes.A synthesis strategy of fluorescent carbon quantum dots（CQDs） with high quantum yield（QY） using aqua mesophase pitch（AMP） as the carbon source has been developed via the hydrothermal method in this study. The hydrothermal temperature and soaking time have important effects on the morphology and QY of CQDs. As-prepared CQDs at 120℃ holding for 24 h（CQDs-120-24） have the uniform size of about 2.8 nm, and the QY can reach 27.6%. The obtained CQDs are successfully modified with ammonia and thionyl chloride, respectively, and they exhibit an excellent photocatalytic performance on degrading rhodamine B（Rh B）, methyl blue（MB） and indigo carmine（IC）. Importantly, the degradation percentage of N-CQDs on Rh B under natural light for 4 h reaches 97% with the degradation rate constant of 0.02463 min-1 and it can maintain 93% after repetitively used 5 times. The results indicate that these as-prepared CQDs have the potential application in degrading organic dyes.

关 键 词：Carbon quantum DOTS AQUA MESOPHASE PITCH PHOTOCATALYTIC performance Degradation rate 

分 类 号：TG[金属学及工艺]