Tailoring of low grade coal to fluorescent nanocarbon structures and their potential as a glucose sensor

Abstract

Lignite is an abundantly utilized feedstock for the facile synthesis of fluorescent carbon dots and carbon nanomaterials. Its value is appreciated as an energy source for combustion for long time. Herein we report a novel top-down strategy to synthesis lignite based fluorescent nano carbon structures by combined acidic oxidation and chemical reflux. The nanocarbon crystallites in lignite are converted to oxygenated nano carbon dots and graphene sheets. They exhibited stable fluorescence property in the visible region depending on their size, functionalities and defects which were highly stable in all the pH conditions. These nanocarbon structures are an effective probe for fluorescent sensing of label-free and selective detection of glucose ions with detection limit as low as 0.125 mM, promising real-world sensor applications. These findings establish a scalable method for the production of fluorescent carbon based glucose sensor from lignite.

Crude Oil Sensing using Carbon Nano Structures Synthetized from Phoenix Dactylifera L. Cellulose

“…And to remove lignin, leaves were soaked in hydrogen peroxide (30 vol%) and acetic acid solution (volume ratio of 1:1), and boiled with magnetic stirring at 60 °C for 7 h. Water was used to wash the residue and then filtered until the filter was neutral. The fibers obtained were boiled in 5 wt% of sodium hydroxide solution at 80 °C for 2 h, then, washed with water to neutral and dried in the oven at 80 °C for 24 h. The cellulose fibers from Phoenix Dactylifera L. leaves were obtained 12,13 .…”

Facile synthesis of graphene-tin oxide nanocomposite derived from agricultural waste for enhanced antibacterial activity against Pseudomonas aeruginosa

“…A fine tuning of the emission peaks from the carbon core is observed with the incorporation of tin nanoparticles. Both quantum size effect and surface effect could be responsible for this excitation independent behavior showcased by GTO nanocomposite 56–58 .

Figure 8PL spectra of GO and GTO nanocomposite derived from wood and coconut shell.

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Coal-Based Fluorescent Zero-Dimensional Carbon Nanomaterials: A Short Review

“…Lignite-derived CNs are also a good hyperglycemia glucose monitoring sensor, with a limit of detection of 0.125 mM. 54 This report is first of its kind in a coal-based nanostructure as a fluorescent glucose sensor.…”

“…35 This method introduces negatively charged oxygen functional groups to the synthesized CNs, making them hydrophilic and defective in nature. 54 Ye et al 35 reported the synthesis of GQDs from coal of different ranks, anthracite, bituminous coal, and coke, using a one-step acidic oxidation technique with H 2 SO 4 and HNO 3 (Figure 2). The three precursors were studied in detail using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy.…”

“…The chemical oxidation method is one of the facile and effective methods for the extraction of CNs from coal. ,, The small-sized crystalline carbon domains with defects present in the coal can be easily displaced with a simple oxidation technique . This method introduces negatively charged oxygen functional groups to the synthesized CNs, making them hydrophilic and defective in nature . Ye et al reported the synthesis of GQDs from coal of different ranks, anthracite, bituminous coal, and coke, using a one-step acidic oxidation technique with H 2 SO 4 and HNO 3 (Figure ).…”