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Carbon dot/silicon dioxide composite material as well as preparation method and application thereof

A composite material, silica technology, applied in chemical instruments and methods, special compound water treatment, physical/chemical process catalysts, etc., can solve problems such as separation difficulties, achieve high photocatalytic activity, good light confinement ability, large ratio The effect of surface area

Active Publication Date: 2022-06-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diameter of carbon dots is less than 10nm, and it is difficult to separate them when they exist independently, so they need to be combined with other solid materials to coexist

Method used

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  • Carbon dot/silicon dioxide composite material as well as preparation method and application thereof
  • Carbon dot/silicon dioxide composite material as well as preparation method and application thereof
  • Carbon dot/silicon dioxide composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1SiO 2 and carbon dots / SiO 2 Synthesis of composite materials

[0038] Synthesis of SiO by Sol Method 2 and carbon dots / SiO 2 composite material.

[0039] The carbon dot solution used is the blue light carbon dot solution synthesized by the hydrothermal method, and the specific process is as follows: the carbon dot solution is prepared by the hydrothermal method, and the reagents used are absolute ethanol, tryptophan, o-phenylenediamine, concentrated hydrochloric acid (mass fraction. 38%), the above reagents were mixed uniformly with magnetic stirring in the autoclave. Put the sealed reaction kettle into an oven, set the temperature to 160 °C and heat for 7 h, and take it out after the temperature is cooled to room temperature, and the obtained carbon dot solution is filtered and sealed for storage.

[0040] Blank sample SiO 2 Preparation process: add 50 mL of anhydrous ethanol solution to the beaker, then add 2 mL of tetraethyl silicate, magnetically stir...

Embodiment 2

[0042] Example 2SiO 2 and carbon dots / SiO 2 Application of composite materials in photocatalytic removal of uranium

[0043] 30mg SiO 2 and 30mg carbon dots / SiO 2 The composite material was used for photocatalytic removal of uranium solution with a concentration of 0.4 mM and a volume of 50 mL. It was reacted in the dark for 1 h under dark conditions, and then placed in a photoreaction box, and a 425 nm filter was added to obtain visible light conditions. Begin under visible light conditions, begin to carry out photocatalytic reaction, take a sample every 20min, use the mixed solution of tartaric acid+diluted nitric acid+arsazo III as color developer, place it in a spectrophotometer and measure its absorbance at 652nm. The experimental results are as figure 1 shown, it is SiO 2 and different carbon dots / SiO 2 Comparison of photocatalytic removal of uranium by composite materials. It can be clearly seen that the composite material added with carbon dots is better than Si...

Embodiment 3

[0045] Embodiment 3 The research of recycling performance

[0046] To study the carbon dots / SiO of the present invention 2 The practical applicability of the composite was tested for its photocatalytic cycling performance. The specific operation process is as follows: according to the operation process of Example 2, the photocatalysis is performed once, and the absorbance is measured about an hour after the light is turned on, and the measured value reaches more than 0.8h. At this time, 10mL of dilute HNO is added to the remaining solution. 3 solution, let stand for half an hour, and measure the absorbance value of uranium until it returns to the initial value. Then centrifuged, washed twice with pure water, poured off the supernatant and added new uranium solution to start a new round of photocatalysis. The experimental results are as Image 6 As shown, after 5 cycles, the carbon dots / SiO prepared in Example 1 2 The photocatalytic performance of the composite material for...

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Abstract

The invention discloses a carbon dot / silicon dioxide composite material and a preparation method and application thereof, and relates to the technical field of preparation of carbon dot composites.The preparation method comprises the following steps that tetraethyl silicate is added into absolute ethyl alcohol, then a blue light carbon dot solution is added, stirring is conducted, ammonia water is added, stirring, centrifuging, washing and drying are conducted, and the carbon dot / silicon dioxide composite material is obtained. The material is applied to photocatalytic removal of uranium, has the advantages of high removal efficiency, low consumption, good repeatability and the like, and is expected to be really applied to purification and separation of uranium in uranium-containing wastewater.

Description

technical field [0001] The invention relates to the technical field of preparation of carbon point composite materials, in particular to a carbon point / silica composite material, a preparation method and applications thereof. Background technique [0002] Nuclear energy is widely regarded as a good alternative to fossil fuels due to its high energy density and low greenhouse gas emissions. Uranium is the fuel for the nuclear industry, and the rapid development of nuclear energy will lead to a substantial increase in the demand for uranium resources. However, uranium reserves are limited, and uranium itself is highly radioactive. With the rapid development of nuclear energy, the impact of radioactive hazards on the environment should be minimized. Therefore, a new source of continuous supply of uranium is urgently needed. For the separation of uranium in water, techniques such as ion exchange, adsorption, and evaporation are widely used, but they all have some limitations a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/08B01J21/18B01J35/00C02F1/30C22B7/00C22B60/02G21F9/06C02F101/20
CPCB01J21/18B01J21/08C02F1/30G21F9/06C22B60/0278C22B7/006C02F2305/10C02F2101/006C02F2101/20B01J35/396B01J35/39Y02P10/20
Inventor 王哲张令宇谢岚胡德忠王祥科
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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