Carbon quantum dots and preparation method thereof
A technology of carbon quantum dots and gel method, applied in chemical instruments and methods, nanocarbon, nanotechnology, etc., to achieve the effects of shortening reaction time, narrow product size distribution, and large yield
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[0049] In some specific embodiments, the preparation method of bulk precursor-silica gel includes: preparing the quantum dot precursor as a 1-80w% aqueous solution, mixing the quantum dot precursor aqueous solution with sodium methyl silicate, silicic acid One or more solutions of sodium, sodium methyl metasilicate, sodium metasilicate, or sodium methyl silicate, sodium silicate, sodium methyl metasilicate, metasilicate treated with sulfonic acid resin One or more than two solutions of sodium are mixed, and the DH value is adjusted with hydrochloric acid solution, sulfuric acid solution, phosphoric acid solution, nitric acid solution or other acidic solutions to form a blocky jelly-like precursor-silica gel.
[0050] In some preferred embodiments, the method for preparing carbon quantum dots by hydrothermal carbonization of bulk precursor-silica gel includes:
[0051] Preparation of bulk precursor-silica gel: first prepare carbon quantum dot precursor aqueous solution, (methyl...
Embodiment 1
[0069] Glucose was formulated into a 50wt.% aqueous solution as a precursor aqueous solution. Mix 180 kg of 50w% sodium methyl silicate, 70 kg of water, and 6 kg of 50wt.% glucose aqueous solution, and stir for 10 minutes. During stirring, 35.5 kg of 18w% hydrochloric acid solution was added, pH=12. After the stirring was stopped, the gel would gel within 3 minutes to obtain a whole piece of translucent glucose-silica gel with a precursor content of 1 wt.%.
[0070] Cut the whole piece of translucent glucose-silicone gel into 10 cm square blocks, put them into ten 50-liter PTFE barrels, and put them into a 1000-liter high-pressure reaction tank with a steel mesh compartment at the bottom. It is advisable to add a small amount of water so as not to overflow the steel mesh to balance the vapor pressure inside and outside the gel. Heat to 200°C, pressure 1.2Mpa, keep warm for 24 hours.
[0071] After cooling to room temperature, take out the PTFE barrel, pour the carbide into a...
Embodiment 2
[0077] Glucose was prepared as a 50 wt.% aqueous solution, and ethylenediamine hydrochloride was prepared as a 50 wt.% aqueous solution as the precursor aqueous solution. Mix 18 kg of 50w% sodium methyl silicate with 100 kg of 50wt.% glucose aqueous solution and stir for 10 minutes. Add 10 kg of 50wt.% ethylenediamine hydrochloride aqueous solution during stirring, pH = 9, after the stirring is stopped, it will gel within 3 minutes to obtain a whole piece of translucent glucose-silica gel with a precursor content of 42.5wt. %.
[0078] Cut the whole piece of translucent glucose-silicone gel into 10 cm square blocks, put them into ten 50-liter PTFE barrels, and put them into a 1000-liter high-pressure reaction tank with a steel mesh compartment at the bottom. It is advisable to add a small amount of water so as not to overflow the steel mesh to balance the vapor pressure inside and outside the gel. Heat to 200°C, pressure 1.2Mpa, keep warm for 24 hours.
[0079] After coolin...
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