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Preparation method of efficient composite photocatalyst Ag20/alpha-FeOOH with visible light response

A technology of composite light and visible light, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. To achieve the effect of being conducive to degradation, improving photocatalytic activity, and easy availability of raw materials

Active Publication Date: 2018-10-16
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although, the preparation of α-FeOOH has a variety of technologies, including Fe(OH) 2 The precursor is oxidized to generate α-FeOOH. The temperature of the oxidation process in this method is in the range of 250°C to 400°C. The preparation process is complicated and consumes a lot of energy.
In addition, due to the high conduction band potential of goethite (α-FeOOH), the electron acceptor O cannot be reduced 2 , leading to the difficulty of electron-hole separation, resulting in lower photocatalytic activity

Method used

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  • Preparation method of efficient composite photocatalyst Ag20/alpha-FeOOH with visible light response
  • Preparation method of efficient composite photocatalyst Ag20/alpha-FeOOH with visible light response

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[0029] The invention provides a high-efficiency composite photocatalyst Ag with visible light response 2 The preparation method of O / α-FeOOH comprises the steps:

[0030] 1) Ultrasonic dispersion: Mix α-FeOOH nanoparticles with alkaline solution and then disperse ultrasonically to form a uniform solid suspension;

[0031] 2) standing reaction: adding dropwise silver nitrate solution to the solid suspension obtained in step 1) for standing reaction, and then through solid-liquid separation to obtain a solid phase;

[0032] 3) Drying and grinding: washing the solid phase obtained in step 2) until neutral, then drying and grinding in sequence.

[0033] In the above technical solution, in the step 1), in the step 1), the alkaline solution is selected from sodium hydroxide solution and potassium hydroxide solution.

[0034] In the above technical solution, in the step 1), the molar ratio of the α-FeOOH nanoparticles to the solute in the alkaline solution is 1:(4-16).

[0035] In...

Embodiment 1

[0047]High-efficiency composite photocatalyst Ag with visible light response of the present invention 2 The preparation method of O / α-FeOOH comprises the following steps: Weigh the α-FeOOH nanoparticles of 0.0005mol, add 10mL of deionized water, and then dropwise add 10mL of NaOH solution with a molar concentration of 0.8mol / L (wherein, n( α-FeOOH):n(NaOH)=1:16), ultrasonically dispersed for 30min, then added dropwise 10mL of AgNO with a molar concentration of 0.8mol / L under stirring 3 solution (where n(AgNO 3 ):n(NaOH)=1:1) to the above suspension, then add 40mL deionized water, the pH value of the solid suspension is maintained at 11~12, let it stand for 2~3h, wash until the pH is 7±0.5, Dry at 70°C for 10 hours, and grind for later use to obtain Ag 2 O / α-FeOOH composite photocatalyst, counted as Ag / 5%Fe sample.

[0048] Wherein, the preparation method of α-FeOOH nanoparticles comprises the following steps: get 4.04g Fe(NO 3 ) 3 9H 2 O, then add deionized water to make...

Embodiment 2

[0050] High-efficiency composite photocatalyst Ag with visible light response of the present invention 2 The preparation method of O / α-FeOOH comprises the steps of: taking 0.001mol of α-FeOOH nanoparticles, adding 10mL of deionized water, then adding dropwise 10mL of NaOH solution with a molar concentration of 0.8mol / L (where n(α -FeOOH):n(NaOH)=1:8), ultrasonically dispersed for 30min, then added dropwise 10mL of AgNO with a molar concentration of 0.8mol / L under stirring 3 solution (where n(AgNO 3 ):n(NaOH)=1:1) to the above suspension, then add 40mL deionized water, the pH value of the solid suspension is maintained at 11~12, let it stand for 1~2h, wash until the pH is 7±0.5, Dry at 60°C for 14 hours, and grind for later use to obtain Ag 2 O / α-FeOOH composite photocatalyst, calculated as Ag / 10%Fe.

[0051] Wherein, the preparation method of α-FeOOH nanoparticles comprises the following steps: get 4.04g Fe(NO 3 ) 3 9H 2 O, then add deionized water to make the volume rea...

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Abstract

The invention discloses a preparation method of efficient composite photocatalyst Ag20 / alpha-FeOOH with visible light response, comprising the steps of 1) performing ultrasonic dispersion, to be specific, mixing alpha-FeOOH nanoparticles and an alkaline solution, and ultrasonically dispersing the mixture to form a uniform solid suspension; 2) allowing standing to carry out reacting, to be specific, dropwise adding silver nitrate solution into the solid suspension of step 1), allowing standing to carry out reacting, and performing solid-liquid separation to obtain solid; 3) drying, and grinding, to be specific, washing the solid of step 2) with water until neutrality, and performing drying and grinding in sequence to obtain the photocatalyst. The preparation method has the advantages that absorption range of visible light is widened, charge recombination can be effectively inhibited, photocatalytic activity is higher, and degradation of organics is benefited.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a high-efficiency composite photocatalyst Ag that responds to visible light 2 The preparation method of O / α-FeOOH. Background technique [0002] Goethite (α-FeOOH) is a visible light-responsive semiconductor with a band gap of 2.15-2.6eV. Compared with other photocatalysts, α-FeOOH has mild preparation conditions, simple process, low price, and non-toxic properties. , rich natural reserves and other advantages. α-FeOOH is an environmentally friendly material, so it has many applications in the field of environmental restoration, such as photocatalytic degradation of dyes, organic acids, and aldehydes. Although, the preparation of α-FeOOH has a variety of technologies, including Fe(OH) 2 The precursor is oxidized to generate α-FeOOH. The temperature of the oxidation process in this method is in the range of 250°C to 400°C, and the preparation process is complicated and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/34B01J37/10C02F1/30C02F101/30C02F101/34C02F101/36C02F101/38
CPCC02F1/30B01J23/8906B01J37/10B01J37/343C02F2305/10C02F2101/30C02F2101/34C02F2101/36C02F2101/38B01J35/39
Inventor 张英段帅蒋阮经
Owner YANGTZE UNIVERSITY