Facile and High-Yield Synthesis of Carbon Quantum Dots from Biomass-Derived Carbons at Mild Condition,ACS Sustainable Chemistry & Engineering

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Facile and High-Yield Synthesis of Carbon Quantum Dots from Biomass-Derived Carbons at Mild Condition
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-03-20 00:00:00 , DOI: 10.1021/acssuschemeng.9b00027
Shuangshuang Jing ₁ , Yushuang Zhao ₁ , Run-Cang Sun ₂ , Linxin Zhong ₁ , Xinwen Peng ₁

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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 (∼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 μM. 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.

中文翻译：

在温和条件下从生物质衍生的碳轻松高效地合成碳量子点

由生物质水热合成碳量子点（CQD）是在各个领域应用CQD的绿色且可持续的途径。但是，主要问题之一是CQDs产量低，因为传统的水热处理会产生大量的水焦炭副产物。在这项工作中，我们提出了一种新颖，简便，有效的方法，可通过轻度氧化（NaOH / H ₂ O ₂解决方案）。可以获得76.9 wt％的超高CQDs产率，这比从传统的水热和强酸氧化工艺获得的高得多。此外，CQD具有出色的量子产率（QY），高于（或可比）其他方法的量子产率。另外，CQD具有均匀的尺寸（约2.4 nm），并且可以通过调节氧化剂的浓度来调节其表面状态，从而显着提高QY。CQD对Pb ^2+的检测显示出出色的灵敏度，以及在1.3至106.7μM范围内的良好线性相关性。这些优势，加上低成本，可持续性和绿色工艺，使得这种方法在大规模CQD的合成和应用中具有巨大的潜力。

更新日期：2019-03-20

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