Preparation method of nitrogen-sulfur co-doped carbon quantum dots
A nitrogen-sulfur co-doping, carbon quantum dot technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, nanotechnology, etc. The effect of easy scale-up, lower production cost, and simplified production process
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Embodiment 1
[0018] (1) Select Zhaotong lignite as the raw material, crush it to more than 100 mesh, weigh 0.2g of coal powder and disperse it in a 0.1L aqueous solution with a chloride ion concentration of 1.7mol / L to obtain a water solution with a concentration of 2g / L coal slurry.
[0019] (2) With the titanium that is coated with ruthenium oxide as the anode, with the nickel mesh as the cathode, add the thiourea of 0.1mol in the coal-water slurry that (1) makes, at a current density of 0.5A / cm 2 Next, energize the coal-water slurry obtained in (1) to carry out electrolytic oxidation for 1.5 hours.
[0020] (3) After the reaction is finished, the mixture obtained in (2) is centrifuged at high speed, the unreacted residue is filtered out, and the obtained filtrate is packed into a dialysis bag with a molecular weight cut-off of 3500Da, and the water is changed every 12 hours for dialysis for 3 days;
[0021] (4) Concentrate the solution in the dialysis bag by vacuum distillation, and ...
Embodiment 2
[0029] (1) Select Yining sub-bituminous coal as raw material, crush it to more than 100 mesh, weigh 3g of coal powder and then evenly disperse it in a 0.1L aqueous solution with a concentration of 0.1mol / L by stirring to obtain a water solution with a concentration of 30g / L coal slurry.
[0030] (2) With the titanium coated with ruthenium oxide as the anode and the nickel mesh as the cathode, add 1mol of thiourea to the coal-water slurry prepared in (1), at a current density of 1 A / cm 2 Next, the coal-water slurry obtained in (1) was energized for electrolytic oxidation for 0.5 h.
[0031] (3) After the reaction is finished, the mixture obtained in (2) is centrifuged at high speed, the unreacted residue is filtered out, and the obtained filtrate is packed into a dialysis bag with a molecular weight cut-off of 3500Da, and the water is changed every 12 hours for dialysis for 3 days;
[0032] (4) The solution in the dialysis bag is concentrated by vacuum distillation, and then f...
Embodiment 3
[0034] (1) Select Luliang bituminous coal as the raw material, crush it to more than 100 mesh, weigh 1g of coal powder and disperse it in a 0.1L aqueous solution with a chloride ion concentration of 0.5mol / L to prepare water coal with a concentration of 10g / L pulp.
[0035] (2) With the titanium coated with ruthenium oxide as the anode and the nickel mesh as the cathode, add 0.3mol of thiourea to the coal-water slurry prepared in (1), and the current density is 0.1A / cm 2 Next, energize the coal-water slurry obtained in (1) to carry out electrolytic oxidation for 3.0 hours.
[0036] (3) After the reaction is finished, the mixture obtained in (2) is centrifuged at high speed, the unreacted residue is filtered out, and the obtained filtrate is packed into a dialysis bag with a molecular weight cut-off of 3500Da, and the water is changed every 12 hours for dialysis for 3 days;
[0037] (4) Concentrate the solution in the dialysis bag by vacuum distillation, and then freeze-dry to...
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