Irradiation-Assisted Hydrothermal Conversion of Water Hyacinth Leaves to Fluorescence Carbon Dots with High Quantum Yield

IF 1.2 Q3 MULTIDISCIPLINARY SCIENCES

Journal of Physical Science Pub Date : 2023-08-25 DOI:10.21315/jps2023.34.2.4

Tanagorn Kwamman, Threeraphat Chutimasakul, Panida Sangangam, Nattamon Puengposop, Pattanapong Thangsunan, Tinutda Phonlam, Kanokorn Wechakorn

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引用次数: 1

Abstract

Electron beam irradiation (EBI) (100−400 kGy) was utilised to pretreat water hyacinth (WH). Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), fourier transform infrared (FTIR), UV-vis absorption and fluorescence spectroscopy were used to examine the effects of EBI and hydrothermal temperatures on the physical, chemical and optical characteristics of carbon dots (CDs). The combination of 400 kGy-pretreatment and 250°C-hydrothermal treatment as the optimal condition for CDs synthesis provided the highest quantum yield (QY) of 14.5% and the product yield of 7.5%. Using dynamic light scattering (DLS), the CDs showed an average size of around 180 nm, and the zeta potential analysis revealed the overall negative charge on the CDs’ surface. In comparison, the CDs synthesised via hydrothermal conversion at 250°C without EBI showed a QY of only 4.0% and a product yield of 3.8%, significantly lower than the condition with 400 kGy-pretreatment. The improved optical characteristics of the CDs could result from the high nitrogen contents of WH biomass, oxygen-rich surfaces from EBI pretreatment at 400 kGy and the aromatic skeleton of the CDs.

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水葫芦叶片高量子产率荧光碳点的辐照辅助水热转化

采用电子束辐照(EBI) (100 ~ 400 kGy)预处理水葫芦(WH)。采用扫描电镜(SEM)、x射线光电子能谱(XPS)、傅里叶变换红外光谱(FTIR)、紫外可见吸收光谱(UV-vis absorption)和荧光光谱(fluorescence spectroscopy)研究了EBI和热液温度对碳点(CDs)物理、化学和光学特性的影响。以400 kgy -预处理+ 250℃水热处理为最佳条件合成CDs的量子产率最高(QY)为14.5%，产物产率最高(7.5%)。利用动态光散射(DLS)分析，CDs的平均尺寸约为180 nm, zeta电位分析显示CDs表面的整体负电荷。相比之下，未经EBI的250°C水热转化合成CDs的QY仅为4.0%，产物收率为3.8%，明显低于400 kgy预处理条件。WH生物质的高氮含量、400 kGy EBI预处理后的富氧表面和cd的芳香骨架可以改善CDs的光学特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Physical Science Physics and Astronomy-Physics and Astronomy (all)

CiteScore

1.70

自引率

0.00%

发文量

期刊介绍： The aim of the journal is to disseminate latest scientific ideas and findings in the field of physical sciences among scientists in Malaysia and international regions. This journal is devoted to the publication of articles dealing with research works in Chemistry, Physics and Engineering. Review articles will also be considered. Manuscripts must be of scientific value and will be submitted to independent referees for review. Contributions must be written in English and must not have been published elsewhere.