Highly fluorescent carbon dots from peanut shells as potential probes for copper ion: The optimization and analysis of the synthetic process
Highly fluorescent carbon dots from peanut shells as potential probes for copper ion: The optimization and analysis of the synthetic process
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DOI：
10.1016/j.mtchem.2017.04.004
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发表时间：
2017-09-01
影响因子：
7.3
通讯作者：
Chen, Ningsheng
中科院分区：
文献类型：
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作者：
Ma, Xiaohong;Dong, Yuanhua;Chen, Ningsheng
利用天然材料这种可再生资源代替化学物质作为碳前体来简单合成荧光碳点（FCDs）仍然是一个重大挑战。本研究以花生壳为原料，采用中心复合实验设计优化了单锅热解工艺，制备了光致发光量子产率为10.58%的FCDs。最佳热解条件为温度400℃，热解时间4 h，花生壳重70 g。所制备的FCDs具有独特的激发依赖性、良好的水分散性和光稳定性。分析花生壳热解过程的傅里叶变换红外光谱（FTIR）结果表明，在400℃下，花生壳在3和4 h时发生完全燃烧，由于热解过程后富碳残留物的量不同，FCDs的PL强度并不总是与相应的QY值成正比。荧光猝灭试验分析了它们在Cu2+检测中的灵敏度和选择性。检出限为4.8 mM。我们对花生壳进行热解处理制备fcd不仅是一种绿色简便的方法，也是花生壳回收利用的一种手段。(C) 2017 Elsevier Ltd.版权所有。
The use of natural materials, a renewable resource, instead of chemicals as carbon precursors for simple synthesis of fluorescent carbon dots (FCDs) remains a significant challenge. Here, we report the preparation of FCDs with a photoluminescence (PL) quantum yield (QY) of 10.58% from peanut shells via one-pot pyrolysis treatment optimized by using a central composite experiment design. Optimum pyrolysis conditions were found to be 400 degrees C temperature, 4 h duration, and 70 g peanut shell weight. The as-prepared FCDs possess unique excitation-dependent behavior, good water dispersibility and high photostability. The results of Fourier transform infrared (FTIR) spectroscopy to analyze the pyrolytic process indicated the complete combustion of peanut shells happened at 3 and 4 h at 400 degrees C. The PL intensity of the FCDs was not always proportional to the corresponding QY value in our work due to the different amount of carbon-rich residues after the pyrolysis process. Fluorescence-quenching trials were conducted to analyze their sensitivity and selectivity in Cu2+ detection. The detection limit was found to be 4.8 mM. Our pyrolysis treatment of peanut shells for preparing FCDs is not only a green and facile method but also a means of recycling peanut shells. (C) 2017 Elsevier Ltd. All rights reserved.