Preparation method of graphene oxide quantum dot and product thereof
A technology of graphene quantum dots and graphene nanosheets, which is applied in the field of nanomaterials, can solve the problems of quantum dots being easily polluted, complex preparation process, and three wastes discharge, and achieve unique super self-assembly ability, high purity, and no three wastes The effect of emissions
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[0040] The preparation method of graphene oxide quantum dot provided by the invention is described in detail as follows:
[0041] First place the carbon fiber in a glass or quartz vessel, add water to immerse the carbon fiber; the carbon fiber is polyacrylonitrile-based carbon fiber or pitch-based carbon fiber or viscose-based carbon fiber;
[0042] The water is deionized water, distilled water or pure water. In order to prevent the influence of other ions, it is recommended to use pure water;
[0043] The purpose of immersing the carbon fiber in water is to prevent the ablation of the carbon fiber in the air;
[0044] Then transfer the container containing water and carbon fiber into a microwave oven for microwave radiation;
[0045] The microwave frequency can be 890~940MHz, or 2400~2500MHz, or 5725~5875MHz, or 22000~22250MHz;
[0046] The microwave radiation time is more than 30 seconds, and for obtaining more graphene quantum dots, the radiation time can be extended;
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Embodiment 1
[0055] Add 5.0g of chopped polyacrylonitrile-based carbon fiber into a glass beaker, add 500ml of distilled water to immerse the carbon fiber, turn it into a daily-use microwave oven (2.45GHz, 800W), and microwave for 300 seconds. After cooling, filter the mixture in the beaker with qualitative filter paper (pore size about 50 microns), and the filtrate is the first graphene oxide quantum dot solution. The first graphene oxide quantum dot solution was vacuum distilled and concentrated into 50ml, put into a dialysis bag (Union Carbide, 35,000 Daltons) and sealed, immersed in a beaker with 500ml of distilled water, stirred and dialyzed at 30°C for 24 hours to obtain dialysis The graphene oxide nanosheet solution in the bag and the second graphene oxide quantum dot solution in the dialysis bag were vacuum-distilled and concentrated into 50ml of solutions in the dialysis bag and outside the bag for convenience of detection and comparative analysis. Freeze drying to obtain the seco...
Embodiment 2
[0057] Add 5.0g of chopped pitch-based carbon fiber into a glass beaker, add 500ml of distilled water to immerse the carbon fiber, turn it into a daily microwave oven (2.45GHz, 800W), and microwave for 50 seconds. After cooling, filter the mixture in the beaker with qualitative filter paper (pore size about 50 microns), and the filtrate is the first graphene oxide quantum dot solution. The first graphene oxide quantum dot solution was vacuum distilled and concentrated into 50ml, put into a dialysis bag (Union Carbide, 35000 Daltons) and sealed, immersed in a beaker with 500ml of distilled water, stirred and dialyzed at 30°C for 12 hours to obtain dialysis The graphene oxide nanosheet solution in the bag and the second graphene oxide quantum dot solution in the dialysis bag were vacuum-distilled and concentrated into 50ml of solutions in the dialysis bag and outside the bag for convenience of detection and comparative analysis. Freeze drying to obtain the second graphene oxide ...
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