A magnetic iron-based polyatomic coupling self-assembled two-dimensional nanosheet catalyst and its preparation method and application

A two-dimensional nanometer and polyatomic technology, which is applied in the field of magnetic iron-based polyatomic coupled self-assembled two-dimensional nanosheet catalysts and its preparation, can solve the problems of low quantum effects, unsatisfactory excitation photocatalysis technology, and high carrier recombination rate. problems, to achieve the effect of accelerating the degradation rate, avoiding secondary pollution of the environment, and increasing the production rate and electron migration rate

Active Publication Date: 2022-06-28
ZHEJIANG UNIV OF TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the results showed that Fe 2 o 3 It is not ideal in exciting photocatalytic technology because Fe 2 o 3 The generated carriers (photogenerated electron-hole pairs) have high recombination rate and low quantum effect

Method used

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  • A magnetic iron-based polyatomic coupling self-assembled two-dimensional nanosheet catalyst and its preparation method and application
  • A magnetic iron-based polyatomic coupling self-assembled two-dimensional nanosheet catalyst and its preparation method and application
  • A magnetic iron-based polyatomic coupling self-assembled two-dimensional nanosheet catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 Visible-light photocatalytic degradation of sulfamethoxazole (SMX) by magnetic iron-based polyatomic coupled self-assembled two-dimensional nanosheet catalysts

[0033] To prepare a magnetic iron-based polyatomic coupled self-assembled two-dimensional nanosheet catalyst, the steps are as follows:

[0034] 1) Put 1.10g Zn(NO 3 ) 2 ·6H 2 O and 2.987g Fe(NO 3 ) 3 ·9H 2 Dissolve 2.13 g of citric acid in 5 mL of water to prepare an aqueous solution B; add the aqueous solution B to the metal salt solution A under stirring, and the resulting mixture is stirred and reacted to form a Polynuclear Zn / Fe-citrate complex (citric acid is a chelating agent, which helps the uniform distribution and stabilization of various metal ions in the system; at the same time, it has a steric hindrance effect, which affects the self-assembly and growth process of the material) ;

[0035]2) 4.5mL of ammonia water with a concentration of 25~28% by weight is slowly added dropwise to...

Embodiment 2

[0045] Example 2 Visible light photocatalytic degradation of sulfamethoxazole (SMX) by magnetic iron-based polyatomic coupled self-assembled two-dimensional nanosheet catalysts

[0046] To prepare a magnetic iron-based polyatomic coupled self-assembled two-dimensional nanosheet catalyst, the steps are as follows:

[0047] 1) Put 0.948g Mg(NO 3 ) 2 ·6H 2 O and 2.987g Fe(NO 3 ) 3 ·9H 2 Dissolve 2.13 g of citric acid in 5 mL of water to prepare an aqueous solution B; add the aqueous solution B to the metal salt solution A under stirring, and the resulting mixture is stirred and reacted to form a Multinuclear Mg / Fe-citrate complex;

[0048] 2) Under rapid stirring, slowly add 4.0 mL of ammonia water with a concentration of 25 to 28% by weight to the mixture obtained in step 1) drop by drop, so that the pH value reaches 7, then add 2 mL of ethylene glycol, and continue to stir for 2 hours to make it evenly mixed;

[0049] 3) Transfer the mixed solution obtained in step 2) i...

Embodiment 3

[0056] Example 3 Visible light photocatalytic degradation of sulfamethoxazole (SMX) by magnetic iron-based polyatomic coupled self-assembled two-dimensional nanosheet catalysts

[0057] To prepare a magnetic iron-based polyatomic coupled self-assembled two-dimensional nanosheet catalyst, the steps are as follows:

[0058] 1) Put 1.323g Mn (NO 3 ) 2 (50% by weight aqueous solution) and 2.987g Fe(NO 3 ) 3 ·9H 2 Dissolve 2.13 g of citric acid and dissolve in 5 mL of water to obtain aqueous solution B; add aqueous solution B to metal salt solution A under stirring, and stir and react in the obtained mixed solution to form a multi-nuclear solution Mn / Fe-citrate complex;

[0059] 2) 3.9 mL of ammonia water with a concentration of 25-28% by weight was slowly added dropwise to the mixture obtained in step 1) under rapid stirring to make the pH value reach 7, then 2 mL of ethylene glycol was added, and stirring was continued for 2 hours to make it evenly mixed;

[0060] 3) Trans...

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Abstract

The present application discloses a magnetic iron-based polyatomic coupling self-assembled two-dimensional nanosheet catalyst and its preparation method and application. In water, fully mix with the previously prepared citric acid aqueous solution to form a polynuclear metal atom citrate complex, adjust the pH of the solution to 6.8~7.5 by dropping ammonia water under rapid stirring, and add a certain amount of ethylene glycol, through the sol‑ The colloid is obtained by the gel method, which is then ground into a powder, and calcined in a muffle furnace to obtain a magnetic self-assembled two-dimensional sheet-like nanomaterial, which is an iron-based catalyst that couples various metal atoms. The catalyst of the present invention can effectively degrade organic pollutants through photocatalysis under visible light, realize efficient utilization of sunlight, take into account energy saving and environmental purification functions at the same time, and is expected to accelerate the separation of nanomaterials and avoid secondary environmental pollution by combining magnetic separation technology , Reduce post-processing costs.

Description

technical field [0001] The invention relates to the technical field of organic pollutant treatment in environmental systems, in particular to a magnetic iron-based polyatomic coupled self-assembled two-dimensional nanosheet catalyst and a preparation method and application thereof. Background technique [0002] New environmental pollutants such as persistent organic pollutants (POPs), pharmaceuticals and personal care products (PPCPs) and disinfection by-products (DBPs) in the environment have attracted widespread attention from all walks of life because of their potential threats to the ecological environment and human health. Sulfonamides, as antibiotics and personal care products, are a new type of organic pollutants in the world's water environment. Due to their low biodegradability, their removal efficiency in wastewater treatment plants (WWTPs) is low, and their widespread use leads to bacterial resistance. and resistance genes, so it is considered a potential threat t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J35/10B01J37/03C02F1/30C02F101/30
CPCB01J23/8892B01J23/005B01J35/023B01J35/1004B01J35/0033B01J37/036C02F1/30B01J2523/00C02F2305/10C02F2101/30B01J2523/22B01J2523/27B01J2523/72B01J2523/842
Inventor 胡钟霆陈月王家德谢东文赵峻顾凯红郑琰琰陈志浩龚思燕
Owner ZHEJIANG UNIV OF TECH
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