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Formation of carbon quantum dots and graphene nanosheets from different abundant carbonaceous materials
Diamond and Related Materials ( IF 4.1 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.diamond.2020.107813
Monikankana Saikia , Tonkeswar Das , Nikalabh Dihingia , Xing Fan , Luis F.O. Silva , Binoy K. Saikia

Abstract Carbon quantum dots (CQDs) and graphene nanosheets (GNs) are one of the most attractive fluorescent carbon nano-sized materials with unique features of optical and physico-chemical properties having various applications in chemical sensing, biomedicine, semiconductor devices, photo-catalyzing, and electrocatalysis. The primary purpose of this preliminary work is the feasibility study for synthesis of nano-structured value-added carbon products i.e., CQDs and GNs from cheap and abundant carbon sources, such as coal, petroleum coke, graphite, and coal-based humic acid by hydrothermal techniques. The physico-chemical properties of the raw precursors were evaluated by proximate and ultimate analysis. High resolution-transmission electron microscopy (HR-TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Fourier transforms infrared (FT-IR) spectroscopy, X-ray powder diffractometer (XRD), UV–visible (UV–vis), and fluorescence (FL) spectroscopy were used to achieve physico-chemical parameters of carbon nanostructures, to better comprehend the development of carbon quantum dots and graphene nanosheets. HR-TEM analysis indicates that the dimensions of the synthesized CQDs from different carbon sources exist in the range of 3–6.5 nm. The approximate quantum yields (QY) of the synthesized carbon nanomaterials were found to be about 2–22%. The synthesized carbon based nanomaterials (i.e. CQDs and GNs) have been efficiently used in the photo-degradation of harmful 2-nitrophenols (2-NP) with the efficiency of 80.79% for CQDs and 82.53% for GNs, respectively. The present study provides a simple and efficient technique for large-scale fabrication of typical CQDs and GNs from abundantly available low-grade coal and other carbonaceous materials for photo-catalysis application.

中文翻译:

从不同丰富的碳质材料形成碳量子点和石墨烯纳米片

摘要 碳量子点 (CQDs) 和石墨烯纳米片 (GNs) 是最具吸引力的荧光碳纳米材料之一,具有独特的光学和物理化学性质,在化学传感、生物医学、半导体器件、光催化等领域有着广泛的应用。 , 和电催化。这项初步工作的主要目的是从廉价和丰富的碳源,如煤、石油焦、石墨和煤基腐植酸合成纳米结构的增值碳产品,即 CQDs 和 GNs 的可行性研究。水热技术。原始前体的物理化学性质通过近似和最终分析进行评估。高分辨率透射电子显微镜 (HR-TEM)、拉曼光谱、X 射线光电子能谱 (XPS)、傅里叶变换红外 (FT-IR) 光谱、X 射线粉末衍射仪 (XRD)、紫外-可见 (UV-vis) 和荧光 (FL) 光谱用于获得碳纳米结构的物理化学参数,以更好地理解碳纳米结构的物理化学参数。碳量子点和石墨烯纳米片的开发。HR-TEM 分析表明,来自不同碳源的合成 CQD 的尺寸存在于 3-6.5 nm 范围内。发现合成的碳纳米材料的近似量子产率 (QY) 约为 2-22%。合成的碳基纳米材料(即 CQDs 和 GNs)已被有效地用于有害 2-硝基苯酚(2-NP)的光降解,CQDs 的效率分别为 80.79% 和 GNs 的 82.53%。
更新日期:2020-06-01
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