热液循环
水热碳化
材料科学
碳纤维
氮气
微波食品加热
水热合成
量子产额
溶解
纳米片
碳化
冷凝
分析化学(期刊)
兴奋剂
化学工程
荧光
纳米技术
化学
扫描电子显微镜
环境化学
有机化学
光电子学
复合材料
工程类
物理
复合数
热力学
量子力学
作者
Chengzhi Xu,Xiao Xiao,Chaonan Cai,Qunpeng Cheng,Lian Zhu,Juntao Zhang,Benmei Wei,Haibo Wang
标识
DOI:10.1007/s11356-023-26275-z
摘要
The preparation of carbon dots (CDs) from waste fish scales is an attractive and high-value transformation. In this study, fish scales were used as a precursor to prepare CDs, and the effects of hydrothermal and microwave methods on their fluorescence properties and structures were evaluated. The microwave method was more conducive to the self-doping of nitrogen due to rapid and uniform heating. However, the low temperature associated with the microwave method resulted in insufficient dissolution of the organic matter in the fish scales, resulting in incomplete dehydration and condensation and the formation of nanosheet-like CDs, whose emission behavior had no significant correlation with excitation. Although the CDs prepared using the conventional hydrothermal method showed lower nitrogen doping, the relative pyrrolic nitrogen content was higher, which was beneficial in improving their quantum yield. Additionally, the controllable high temperature and sealed environment used in the conventional hydrothermal method promoted dehydration and condensation of the organic matter in the fish scales to form CDs with a higher degree of carbonization, uniform size, and higher C = O/COOH content. CDs prepared using the conventional hydrothermal method exhibited higher quantum yields and excitation wavelength-dependent emission behavior.
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