研究目的
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.
研究成果
The hydrothermal technique is proven to involve minimum effort and is a cost effective way of synthesizing of carbon nanomaterials like carbon quantum dots and graphene nanosheets with excellent blue-fluorescent properties from different abundantly available carbonaceous materials. The synthesized CQDs and GNs might also be efficiently used in the photo-degradation of harmful 2-nitrophenols in water systems.
研究不足
The study mentions the need for optimization of process parameters for final application of this process in industrial scale.
1：Experimental Design and Method Selection:
Hydrothermal technique was used for the synthesis of CQDs and GNs from different carbon sources.
2：Sample Selection and Data Sources:
Low-quality subbituminous coal sample (Coal-NG), petroleum coke (PC), coal-derived humic acid (Coal-NK-HA), and commercially purchased graphite (CG) were used as precursors.
3：List of Experimental Equipment and Materials:
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) spectrophotometer were used.
4：Experimental Procedures and Operational Workflow:
Samples were dissolved in ultrapure water and treated in a Teflon-lined autoclave at 200oC for 120 minutes. The products were then filtered and dialyzed.
5：Data Analysis Methods:
The physico-chemical properties of the synthesized nanomaterials were analyzed using various spectroscopic and microscopic techniques.
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