A method for preparing fluorescent carbon quantum dots using organic matter anaerobic fermentation intermediates as carbon-based materials
An anaerobic fermentation and carbon quantum dot technology, which is applied in the field of waste resource conversion, achieves the effect of simple operation, mild reaction conditions, and realization of value-added utilization of resources
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Embodiment 1
[0032] This example uses the intermediate waste liquid of anaerobic fermentation of sodium butyrate as the raw material, which is rich in short-chain volatile fatty acids (VFAs) such as butyric acid, propionic acid, and acetic acid, and is a good carbon-based material, so it can be used to prepare fluorescent Carbon quantum dots. Specific steps are as follows:
[0033] (1) The intermediate waste liquid of sodium butyrate anaerobic fermentation was placed in a centrifuge tube, centrifuged at 8000 rpm for 5 min, the obtained supernatant was passed through a filter membrane of 0.22 μm, and the filtrate was obtained;
[0034] (2) take 10mL of filtrate in a polytetrafluoroethylene reactor, then add 0.5mL of ethylenediamine and 9.5mL of ultrapure water, fully stir to obtain a mixed solution;
[0035] (3) placing the polytetrafluoroethylene reaction kettle in an electric heating blast drying oven, and reacting at 220° C. for 6 hours to obtain a pale yellow solution;
[0036] (4) ta...
Embodiment 2
[0045] The acid production process of cyanobacterial anaerobic fermentation is to convert organic matter in the form of soluble monomers or dimers into short-chain fatty acids or alcohol-based end products. These hydrolyzed monomers will be further degraded by microorganisms into acidified products such as volatile fatty acids, lactic acid, alcohol, ammonia, hydrogen and carbon dioxide, and secreted out of the cell. The present embodiment takes the intermediate waste liquid of the cyanobacterial anaerobic fermentation and acidification process to carry out experiments, and the specific steps are as follows:
[0046] (1) take the cyanobacterial anaerobic fermentation intermediate waste liquid in the centrifuge tube, centrifuge at 8000rpm for 5min, the obtained supernatant is passed through a 0.22 μm filter membrane, and the filtrate is obtained;
[0047] (2) get 15mL of filtrate in the polytetrafluoroethylene reactor, then add 2mL of ethylenediamine and 3mL of ultrapure water, ...
Embodiment 3
[0054] Rumen microorganisms are often used for anaerobic digestion of cellulosic materials, agricultural residues and aquatic plants. In the anaerobic digestion reactor dominated by rumen microorganisms, the main process intermediates are organic acids. The present embodiment takes the rumen microorganism anaerobic fermentation intermediate waste liquid of human banana to carry out the experiment, and the concrete steps are as follows:
[0055] (1) The intermediate waste liquid of canna rumen microorganism anaerobic fermentation is placed in a centrifuge tube, centrifuged at 8000rpm for 5min, and the obtained supernatant is passed through a filter membrane of 0.22 μm, and the filtrate is obtained;
[0056] (2) take 10mL of filtrate in a polytetrafluoroethylene reactor, then add 1mL of ethylenediamine and 9mL of ultrapure water, fully stir to obtain a mixed solution;
[0057] (3) placing the polytetrafluoroethylene reaction kettle in an electric heating blast drying oven, and r...
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