Preparation of carbon quantum dots from organic wastewater and its coagulation recovery method
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A technology of carbon quantum dots and organic wastewater, applied in the field of chemical nanomaterials, can solve the problems of nano-pollution and incomplete removal, and achieve the effects of pollution prevention, simple operation, and simple preparation process equipment
Active Publication Date: 2018-01-26
DALIAN UNIV OF TECH
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[0004] Carbon quantum dot materials have a unique size effect. Generally, the size of synthesized carbon quantum dot materials is about 2-10nm, and quantum dot materials have good water solubility. It is difficult to separate them by general suction filtration, centrifugation, dialysis and other separation methods. Separation, incomplete removal can easily cause nano-pollution
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Embodiment 1
[0021] 1) Add 2 mL of passivating agent ethylenediamine to 15 mL of coal chemical wastewater, and disperse it ultrasonically for 10 minutes to obtain a uniform liquid;
[0022] 2) Add the above-mentioned liquid into a polyethylene-lined reaction kettle, put it into a microwave oven, use 700W power, and microwave for 2 minutes to obtain a brownish-yellow carbon quantum dot liquid;
[0023] 3) the liquid obtained in step 2) was washed with NaOH / H 2 SO 4 Adjust its pH to neutral.
Embodiment 2
[0025] 1) Add 2 mL of passivating agent ethylenediamine to 15 mL of protein wastewater, and ultrasonically disperse for 5 minutes to obtain a uniform orange liquid;
[0026] 2) Add the above orange liquid into a polyethylene-lined reaction kettle, put it into a microwave oven, use 700W power, and microwave for 4 minutes to obtain a brown-yellow carbon quantum dot liquid;
[0027] 3) the liquid obtained in step 2) was washed with NaOH / H 2 SO 4 Adjust its pH to neutral.
Embodiment 3
[0029] The carbon quantum dots prepared in Example 1 are recovered by titanium coagulation;
[0030] 1) Apply titanium sulfate to configure 2M titanium salt coagulant solution;
[0031] 2) Get 2 milliliters of coagulant and join in the quantum dot concentrate that embodiment one obtains, stir evenly;
[0032] 3) Adjust the pH of the mixed solution in 2) to about 8-9, and stir rapidly for 5 minutes at the same time;
[0033] 4) After stirring slowly for 30 minutes, let it stand for 2 hours;
[0034] 5) filtering to obtain the coagulant solid of adsorbed carbon quantum dots;
[0035] 5) The UV absorption spectrum of the sample flocculant in step 5) is shown in figure 2 ;
[0036] 6) The coagulant XPS characterization in step 6) is shown in image 3 .
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Abstract
The invention provides a method for preparing carbon dots from organic wastewater and realizing coagulation recovery of the carbon dots and belongs to the technical field of chemical nanomaterials. The organic wastewater is used as a carbon source, a microwave oven is used as a reaction platform, the carbon dots are prepared, and dot materials are recovered with the coagulation technology. According to the method, the organic wastewater is used as the carbon source for preparing the carbon dots, re-addition of other organic carbon sources is not required, the fluorescent carbon dots are obtained with the preparing method, operation is simple, the cost is low, the yield is high, preparation technology equipment is simple, preparation can be completed quickly in a short time, and popularization and large-scale production are easy. The carbon dot materials are recovered through titanium coagulation, nano pollution is avoided, recovered dot materials can be utilized, the carbon dots prepared with the method have the advantages of good water solubility, high fluorescence property, photobleaching resistance, adjustable emission spectrum, good biocompatibility, low cytotoxicity and the like, and composites recovered through coagulation have good application prospect in fields of preparation of adsorbents, photocatalysis, biosensors and photoelectronic devices.
Description
technical field [0001] The invention relates to a method for preparing carbon quantum dots from organic wastewater and a method for coagulating and recovering them, belonging to the technical field of chemical nanomaterials. Background technique [0002] In recent years, carbon quantum dots (Carbon dots, particle size <10nm), because of the special zero-dimensional nanostructure with surface effect, small size effect and quantum effect, will also produce special fluorescence characteristics, as a new type of fluorescent material. received great attention from researchers. Compared with traditional semiconductor quantum dots and organic dyes, carbon dots not only maintain the advantages of low toxicity and good biocompatibility of carbon materials, but also have good photostability, adjustable emission wavelength, no light flicker, and two-photon absorption area. The incomparable advantages of large size, easy functionalization, low cost, and easy large-scale preparation ...
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