Photocatalyst as well as preparation method and application thereof

A technology of photocatalyst and reactor, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of complex preparation process, limited potential, high cost, etc. Achieve high-efficiency photocatalytic degradation, promote separation, and low cost

Pending Publication Date: 2022-01-28
JIANGSU UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The patent with the application number CN113477262A discloses a preparation method and application of a silver chromate/zinc ferrite fibrous composite photocatalyst. Electrospinning is used in the preparation process of a silver chromate/zinc ferrite fibrous compos

Method used

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  • Photocatalyst as well as preparation method and application thereof
  • Photocatalyst as well as preparation method and application thereof
  • Photocatalyst as well as preparation method and application thereof

Examples

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Embodiment 1

[0029] A photocatalyst consisting of nanodiamond NDs and yolk-shell structured ZnFe 2 o 4 , the incorporation mass of the NDs is ZnFe 2 o 4 1% of mass. Its preparation method is as follows:

[0030] At room temperature, 0.25 mmol of Zn(NO 3 ) 2 ·6H 2 O, 0.5mmol of Fe(NO 3 ) 3 9H 2 O and the theoretical formation of ZnFe 2 o 4 Add 1% of the mass of NDs into a beaker containing 50mL isopropanol and 10mL glycerin and mix well, then pour it into the reaction kettle, and react at 180°C for 6h. Wash 2 times and dry. The dried product was poured into a crucible, put into a muffle furnace, heated to 350°C at a heating rate of 10°C / min, and kept for 2 hours. After the muffle furnace was cooled to room temperature, the obtained sample was put into an agate mortar, ground to a uniform powder, collected for later use, and recorded as NDs / ZFO-1.

Embodiment 2

[0032] A photocatalyst consisting of nanodiamond NDs and yolk-shell structured ZnFe 2 o 4 , the incorporation mass of the NDs is ZnFe 2 o 4 3% of mass. Its preparation method is as follows:

[0033] At room temperature, 0.24 mmol of Zn(NO 3 ) 2 ·6H 2 O, 0.49mmol of Fe(NO 3 ) 3 9H 2 O and the theoretical formation of ZnFe 2 o 4Add 3% NDs by mass into a beaker containing 49.5mL isopropanol and 9.5mL glycerin and mix evenly, then pour it into the reaction kettle, and react at 170°C for 5h. After the reaction is completed and cooled, the mixture is centrifuged. Wash 3 times with alcohol and dry. The dried product was poured into a crucible, put into a muffle furnace, heated to 340°C at a heating rate of 9.5°C / min, and kept for 1.5h. After the muffle furnace was cooled to room temperature, the obtained sample was put into an agate mortar, ground to a uniform powder, collected for later use, and recorded as NDs / ZFO-3.

Embodiment 3

[0035] A photocatalyst consisting of nanodiamond NDs and yolk-shell structured ZnFe 2 o 4 , the incorporation mass of the NDs is ZnFe 2 o 4 5% of the mass. Its preparation method is as follows:

[0036] At room temperature, 0.27 mmol of Zn(NO 3 ) 2 ·6H 2 O, 0.51mmol of Fe(NO 3 ) 3 9H 2 O and the theoretical formation of ZnFe 2 o 4 Add 5% NDs by mass into a beaker containing 50.5mL isopropanol and 10.5mL glycerin and mix evenly, then pour it into the reaction kettle, and react at 190°C for 7h. After the reaction is completed and cooled, the mixture is centrifuged. Wash 4 times with alcohol and dry. The dried product was poured into a crucible, put into a muffle furnace, heated to 360°C at a heating rate of 9.7°C / min, and kept for 1.8h. After the muffle furnace was cooled to room temperature, the obtained sample was put into an agate mortar, ground to a uniform powder, collected for later use, and recorded as NDs / ZFO-5.

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Abstract

The invention discloses a photocatalyst as well as a preparation method and application thereof. The photocatalyst comprises nano-diamond NDs and ZnFe2O4 with a yolk shell structure, and the doping mass of the NDs is 1-15% of the mass of the ZnFe2O4. The preparation method comprises the steps of adding Zn (NO3) 2.6 H2O, Fe (NO3) 3.9 H2O and NDs into a mixed solution of isopropanol and glycerol, and then preparing a photocatalyst according to a solvothermal method and a calcination method, wherein the obtained photocatalyst can efficiently degrade tetracycline in a water environment under a visible light condition. A stable heterojunction is formed between the nano-diamond component and the zinc ferrite component in the prepared photocatalyst, and compared with pure-phase ZnFe2O4, the degradation performance and the cycle stability of the photocatalyst are more outstanding; besides, the photocatalyst has an excellent magnetic recovery characteristic, so that the catalyst can be efficiently recovered and repeatedly utilized in the process of degrading pollutants in a water environment, and the photocatalyst has certain potential in practical application.

Description

technical field [0001] The invention relates to a catalyst and its preparation method and application, in particular to a photocatalyst and its preparation method and application. Background technique [0002] Photocatalytic technology is a new type of water treatment technology that is environmentally friendly, simple and gentle, and highly efficient and energy-saving. Photocatalysis has the advantages of fast speed, complete degradation, low cost, and non-toxicity in the field of treating pollutant-containing wastewater. At the same time, it can effectively use sunlight as a light source to alleviate the energy crisis. Its working principle is: use sunlight to excite semiconductors to generate photogenerated electron pairs (collectively referred to as carriers), and the generated carriers then generate various free radical active species with strong oxidation-reduction properties in the water environment, which can effectively mine Most of the pollutants are removed by ch...

Claims

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Application Information

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IPC IPC(8): B01J23/80C02F1/30C02F101/38
CPCB01J23/80B01J35/004C02F1/30C02F2101/38C02F2305/10
Inventor 郭峰潘晶晶石宇星施伟龙
Owner JIANGSU UNIV OF SCI & TECH
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