A carbon quantum dot for heavy metal ion adsorption and its preparation method and application
A technology of heavy metal ions and carbon quantum dots, which is applied in the fields of fluorescent nanomaterials and chemical engineering, can solve problems such as endangering human health and harming the environment and ecosystem, and achieve the effects of easy operation, adsorption and sedimentation, and high adsorption efficiency.
Active Publication Date: 2020-08-25
LIAONING UNIVERSITY
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Problems solved by technology
If the industrial wastewater with heavy metal ions is directly discharged into the natural environment, it will not only cause widespread harm to the environmental ecosystem, but also endanger human health
Method used
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Embodiment 1
[0032] (1) Preparation of carbon quantum dots for heavy metal ion adsorption:
[0033] Weigh 0.3g of dithiothreitol and 1g of ethylenediamine, dissolve them in 9mL of ultrapure water, transfer them to a Teflon-lined reactor, and react at 180°C for 12 hours. After the reaction, cool to room temperature, centrifuge to take the supernatant, and dialyze the supernatant with a dialysis bag with a molecular weight cut-off of 14kDa for 48 hours, take out the solution, and freeze-dry to obtain carbon quantum dots for heavy metal ion adsorption. Store at 4°C.
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Abstract
The invention relates to a carbon quantum dot used for heavy metal ion adsorption, as well as a preparation method and an application thereof. The preparation method includes the steps of: 1) dissolving dithiothreitol and ethylenediamine, as carbon sources, in ultrapure water to obtain a mixture liquid; 2) placing the mixture liquid in a reaction kettle with a polytetrafluoroethylene lining, and performing high-temperature reaction in a drying box for 12 h at 180 DEG C; 3) after the reaction is finished, naturally cooling the reactants to room temperature, performing centrifugation to obtain asupernatant, and dialyzing and freeze-drying the supernatant to obtain the carbon quantum dot which has adsorption effect on heavy metal ions, such as Ag, Pb, Cu, Cd, Cr, Zn, Ni, Mn and the like. Thecarbon quantum dot is high in equilibrium adsorption capacity, adsorption efficiency and adsorption speed, is simple in preparation method, is easy to use, is low in preparation cost, and is easy topromote.
Description
technical field [0001] The invention belongs to the fields of fluorescent nanomaterials and chemical engineering, and in particular relates to a preparation method and application of carbon quantum dots (abbreviated as carbon dots) for heavy metal ion adsorption and precipitation. Background technique [0002] The rapid development of industry has brought more and more environmental problems. Heavy metal ions are almost irreplaceable in industry due to their technological importance. Unlike organic pollutants, heavy metal ions are not biodegradable in the environment and can accumulate in organisms and food chains. If the industrial wastewater with heavy metal ions is directly discharged into the natural environment, it will not only cause widespread harm to the environmental ecosystem, but also endanger human health. Therefore, many methods including chemical precipitation, ion exchange, adsorption, membrane filtration, and electrochemical treatment techniques are used to ...
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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/20C02F1/283C02F2101/20
Inventor 刘学吴亚培张国林吴秋华
Owner LIAONING UNIVERSITY
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