期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 8, 页码 7833-7843出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b00027
关键词
Carbon quantum dots; Hydrothermal; Alkaline peroxide; Hydrochar; Biomass
资金
- Guangdong Natural Science Funds for Distinguished Young Scholar [2017A030306029, 2016A030306027]
- Guangdong Special Support Program [2017TQ04Z837]
- Natural Science Foundation of Guangdong Province [2016A030313487]
- Fundamental Research Funds for the Central Universities
- State Key Laboratory of Pulp and Paper Engineering
Hydrothermal synthesis of carbon quantum dots (CQDs) from biomass is a green and sustainable route for CQDs applications in various fields. However, one of the major problems is the low CQDs yield because the traditional hydrothermal treatment would produce large amounts of hydrochar byproduct. In this work; we present a novel, facile, and effective method for large-scale synthesis of CQDs from biomass-derived carbon including hydrochar and carbonized biomass through mild oxidation (NaOH/H2O2 solution). An ultrahigh CQDs yield of 76.9 wt % can be obtained, which is much higher than those obtained from traditional hydrothermal and strong acid oxidation processes. Furthermore, the CQDs have excellent quantum yield (QY) that is higher than (or comparable to) those from other methods. In addition, the CQDs have uniform size (similar to 2.4 nm) and their surface states can be regulated to significantly improve the QY by adjusting the concentration of oxidants. The CQDs displayed excellent sensitivity for Pb2+ detection along with good linear correlation ranging from 1.3 to 106.7 mu M. These advantages, together with low cost, sustainability, and green process, make this approach have great potential in the synthesis and applications of CQDs in large scale.
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