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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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  • Summary
  • 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 composite photocatalyst. wire and high-temperature calcination method, and then use co-deposition method to load silver chromate on the surface of zinc ferrite. The preparation process is complicated and the cost is higher, which limits its potential for practical application.

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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Effect test

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
CPCB01J23/80C02F1/30C02F2101/38C02F2305/10B01J35/39Y02W10/37
Inventor 郭峰潘晶晶石宇星施伟龙
Owner JIANGSU UNIV OF SCI & TECH
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