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Magnetic iron-based self-assembly two-dimensional nanosheet catalyst coupled with multiple metal atoms, and preparation method and application thereof

A two-dimensional nanometer and polyatomic technology, which is applied in the field of magnetic iron-based polyatomic coupling self-assembled two-dimensional nanosheet catalyst and its preparation, can solve the problem of unsatisfactory excitation photocatalysis technology, low quantum effect, high carrier recombination rate, etc. problems, to avoid secondary pollution of the environment, accelerate the degradation rate, increase the production rate and the effect of electron transfer rate

Active Publication Date: 2020-11-17
ZHEJIANG UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Magnetic iron-based self-assembly two-dimensional nanosheet catalyst coupled with multiple metal atoms, and preparation method and application thereof
  • Magnetic iron-based self-assembly two-dimensional nanosheet catalyst coupled with multiple metal atoms, and preparation method and application thereof
  • Magnetic iron-based self-assembly two-dimensional nanosheet catalyst coupled with multiple metal atoms, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 Magnetic iron-based polyatomic coupling self-assembled two-dimensional nanosheet catalyst Visible light photocatalytic degradation of sulfamethoxazole (SMX)

[0033] Preparation of magnetic iron-based polyatomic coupling self-assembled two-dimensional nanosheet catalyst, the steps are as follows:

[0034] 1) 1.10g Zn(NO 3 ) 2 ·6H 2 O and 2.987g Fe(NO 3 ) 3 9H 2 Dissolve O together in 10mL of water to form metal salt solution A for later use; weigh 2.13g of citric acid and dissolve it in 5mL of water to prepare aqueous solution B; add aqueous solution B to metal salt solution A under stirring, and stir in the resulting mixed solution to form Multinuclear 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 materials) ;

[0035]2) Slowly add 4.5mL of ammoni...

Embodiment 2

[0045] Example 2 Magnetic iron-based polyatomic coupling self-assembled two-dimensional nanosheet catalyst Visible light photocatalytic degradation of sulfamethoxazole (SMX)

[0046] Preparation of magnetic iron-based polyatomic coupling self-assembled two-dimensional nanosheet catalyst, the steps are as follows:

[0047] 1) Add 0.948g Mg(NO 3 ) 2 ·6H 2 O and 2.987g Fe(NO 3 ) 3 9H 2 Dissolve O together in 10mL of water to form metal salt solution A for later use; weigh 2.13g of citric acid and dissolve it in 5mL of water to prepare aqueous solution B; add aqueous solution B to metal salt solution A under stirring, and stir in the resulting mixed solution to form Multinuclear Mg / Fe-citrate complex;

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

Embodiment 3

[0056] Example 3 Magnetic iron-based polyatomic coupling self-assembled two-dimensional nanosheet catalyst Visible light photocatalytic degradation of sulfamethoxazole (SMX)

[0057] Preparation of magnetic iron-based polyatomic coupling self-assembled two-dimensional nanosheet catalyst, the steps are as follows:

[0058] 1) 1.323g Mn(NO 3 ) 2 (50% by weight aqueous solution) and 2.987g Fe(NO 3 ) 3 9H 2 Dissolve O together in 5mL water to form metal salt solution A for later use; weigh 2.13g of citric acid and dissolve it in 5mL water to prepare aqueous solution B; add aqueous solution B to metal salt solution A under stirring, and stir in the resulting mixed solution to form a multinuclear solution Mn / Fe-citrate complex;

[0059] 2) Slowly add 3.9mL of ammonia water with a concentration of 25~28% by weight to the mixture obtained in step 1) drop by drop under rapid stirring, so that the pH value reaches 7, then add 2mL of ethylene glycol, and continue stirring for 2 hou...

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Abstract

The invention discloses a magnetic iron-based self-assembly two-dimensional nanosheet catalyst coupled with multiple metal atoms, and a preparation method and application thereof. The preparation method of the catalyst comprises the following steps: uniformly mixing zinc salt, magnesium salt and manganese salt, then dissolving the formed mixture in water together with a certain amount of ferric salt, and fully mixing the mixture with an aqueous citric acid solution prepared in advance to form a polynuclear metal atom citrate complex; dropwise adding ammonia water under rapid stirring to adjustthe pH value of the solution to 6.8-7.5, adding a certain amount of ethylene glycol, and preparing colloid through a sol-gel method; and grinding the colloid into powder, and calcining the powder ina muffle furnace to obtain the magnetic self-assembled two-dimensional sheet structure nanomaterial which is an iron-based catalyst coupled with multiple metal atoms. The catalyst provided by the invention can effectively degrade organic pollutants under visible light through photocatalysis, realizes efficient utilization of sunlight, has both energy saving and environmental purification functions, and is expected to be combined with a magnetic separation technology to accelerate nanomaterial separation, avoid secondary pollution to the environment and reduce post-treatment cost.

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 coupling self-assembled two-dimensional nanosheet catalyst and its preparation method and application. 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 an antibiotic and personal care product, are a new type of organic pollutants in the world's water environment, due to their low biodegradability, low removal efficiency by wastewater treatment plants (WWTPs), and widespread use leading to bacterial resistance and resistance genes, so it is considered a potential threat to natural ecosyste...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J35/10B01J37/03C02F1/30C02F101/30
CPCB01J23/8892B01J23/005B01J37/036C02F1/30B01J2523/00C02F2305/10C02F2101/30B01J35/33B01J35/40B01J35/61B01J2523/22B01J2523/27B01J2523/72B01J2523/842
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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