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Application of zirconium-doped niobium oxyphosphate catalyst in preparation of carbon quantum dots from lignin, preparation method of carbon quantum dots and carbon quantum dots

A technology of niobium oxyphosphate catalyst and carbon quantum dots, applied in heterogeneous catalyst chemical elements, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as environmental pollution and cumbersome processes , to achieve the effect of simple preparation route, strong fluorescence emission and high yield

Active Publication Date: 2020-09-08
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
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  • Claims
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Problems solved by technology

[0007] Therefore, the technical problem to be solved in the present invention is to overcome the preparation of carbon quantum dots by using lignin as a carbon precursor in the prior art, which will cause environmental problems. Pollution and cumbersome defects, thereby providing a zirconium-doped niobium oxyphosphate catalyst in the preparation of carbon quantum dots from lignin and the preparation method of carbon quantum dots, carbon quantum dots

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  • Application of zirconium-doped niobium oxyphosphate catalyst in preparation of carbon quantum dots from lignin, preparation method of carbon quantum dots and carbon quantum dots
  • Application of zirconium-doped niobium oxyphosphate catalyst in preparation of carbon quantum dots from lignin, preparation method of carbon quantum dots and carbon quantum dots
  • Application of zirconium-doped niobium oxyphosphate catalyst in preparation of carbon quantum dots from lignin, preparation method of carbon quantum dots and carbon quantum dots

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preparation example Construction

[0041] The present invention also relates to a method for preparing carbon quantum dots, comprising the following steps:

[0042] Mix lignin, zirconium-doped niobium oxyphosphate catalyst, organic amine reagent and deionized water to obtain the second mixed solution, then perform high-temperature hydrothermal treatment in an inert gas atmosphere, and freeze-dry the crude product after high-temperature hydrothermal treatment to obtain carbon Quantum dots, the specific surface area of ​​the zirconium-doped niobium oxyphosphate catalyst is 50-250m 2 / g, and the amount of strong surface acid at the pyridine desorption temperature>400°C>100μmol / g.

[0043] Specifically, the lignin includes at least one of alkali lignin, kraft lignin, lignosulfonate and enzymatic lignin.

[0044] Specifically, in the zirconium-doped niobium oxyphosphate catalyst, the doping amount of zirconium is 1wt%-10wt%.

[0045] Specifically, the organic amine reagent includes at least one of ethylenediamine,...

Embodiment 1-11

[0053] Embodiment 1-11 relates to a kind of method for preparing carbon quantum dots by lignin, comprises the following steps:

[0054] Dissolve the lignin and zirconium-doped niobium oxyphosphate catalyst in an organic amine reagent and 30 mL of deionized water, and perform ultrasonic treatment to obtain the second mixed solution. Stir the second mixed solution evenly and transfer it to a high-pressure reactor. Under the protection of nitrogen, high-temperature hydrothermal treatment, and then naturally cooled to room temperature, the reacted mixed solution was filtered through a 0.22 μm microporous membrane to remove insoluble carbon, and then the filtrate was transferred to a dialysis bag with a molecular weight of 3000Da for dialysis for 72 hours. Replace deionized water, obtain carbon quantum dots after dialysis purification and freeze drying.

[0055] The concrete process parameter of embodiment 1-11 is as shown in table 1.

[0056] Table 1. The concrete process paramet...

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Abstract

The invention relates to the field of high-value conversion and utilization of biomass, particularly to application of a zirconium-doped niobium oxyphosphate catalyst in preparation of carbon quantumdots from lignin, a carbon quantum dot preparation method and carbon quantum dots. According to the application of the zirconium-doped niobium oxyphosphate catalyst in preparation of carbon quantum dots from lignin, the specific surface area of the zirconium-doped niobium oxyphosphate catalyst is 50-250 m<2> / g, and the surface strong acid amount is greater than 100 [mu]mol / g when the pyridine desorption temperature is greater than 400 DEG C. The zirconium-doped niobium oxyphosphate catalyst has high activity and is stable, and can well catalyze the conversion of lignin by being applied to thepreparation of carbon quantum dots from lignin without adding inorganic acid and alkali.

Description

technical field [0001] The invention relates to the field of high-value conversion and utilization of biomass, in particular to the application of a zirconium-doped niobium oxyphosphate catalyst in the preparation of carbon quantum dots from lignin, a preparation method of carbon quantum dots, and carbon quantum dots. Background technique [0002] Carbon quantum dots are a carbon-based zero-dimensional material. As a new type of fluorescent carbon nanomaterial, it has the advantages of good biocompatibility, low toxicity, tunable photoluminescence and high chemical stability. Chemical biosensing, bioimaging, nanomedicine, and photoelectrocatalysis have been widely used. By passivating and functionalizing the surface of carbon quantum dots, their physical and chemical properties can also be adjusted, thereby expanding their application fields. [0003] At present, the preparation methods of carbon quantum dots are divided into two approaches: top-down and bottom-up. The top...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15B01J27/195B01J35/10C09K11/65B82Y20/00B82Y40/00
CPCC01B32/15B01J27/195B01J23/002C09K11/65B82Y20/00B82Y40/00B01J2523/00C01P2004/04B01J35/30B01J35/613B01J35/615B01J2523/48B01J2523/51B01J2523/56
Inventor 马睿苏天妹王钰王秋月卢信清王宁伟涂高美朱伟东
Owner ZHEJIANG NORMAL UNIVERSITY
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