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High-activity alpha-Fe2O3 nano-sheet as well as preparation method and application thereof

A nano-sheet and high-activity technology, which is applied in the field of high-activity α-Fe2O3 nano-sheet and its preparation, can solve the problems of uncontrollable shape, high preparation cost, and complicated preparation process, so as to improve the photocatalytic degradation activity and improve the catalytic performance. Activity, effect of increasing specific surface area

Active Publication Date: 2019-07-19
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a kind of highly active α-Fe 2 o 3 Nanosheet and its preparation method and application, aiming to solve the problem of existing α-Fe 2 o 3 The material preparation process is complicated, the shape is uncontrollable, the preparation cost is high, and α-Fe 2 o 3 Material activity needs to be further improved

Method used

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  • High-activity alpha-Fe2O3 nano-sheet as well as preparation method and application thereof
  • High-activity alpha-Fe2O3 nano-sheet as well as preparation method and application thereof
  • High-activity alpha-Fe2O3 nano-sheet as well as preparation method and application thereof

Examples

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Embodiment 1

[0047] A highly active α-Fe 2 o 3 A method for preparing nanosheets, comprising the steps of:

[0048] Step 1. Preparation of FeSO 4 Solution: Weigh about 28g low-carbon iron sheet, dissolve in 245g 20% ​​H 2 SO 4 Solution, filter to remove impurities, titrate with potassium dichromate, calculate FeSO 4 concentration, and then the prepared FeSO 4 Solution diluted to 0.5mol / L;

[0049] Step 2. Preparation of δ-FeOOH precursor: take the FeSO prepared above 4 Put 100ml of the solution in a 250ml beaker, add 50ml of 0.01mol / L EDTA solution, adjust the pH to 8.7 with 6mol / L NaOH solution, and use 0.27m 3 .h -1 Air was introduced at a rate of 1.5 h at 20°C, filtered, washed with distilled water, and dried at 70°C for 5 h to obtain the δ-FeOOH precursor;

[0050] Step 2: Take 2.5 g of the δ-FeOOH precursor prepared above, add Na 2 SiO 3 9H 2 O 63.9mg, citric acid 50mg, add 50ml of distilled water, disperse evenly, adjust the pH to 7, transfer to a polytetrafluoroethylene-...

Embodiment 2

[0052] A highly active α-Fe 2 o 3 A method for preparing nanosheets, comprising the steps of:

[0053] Step 1. Preparation of FeSO 4 Solution: Weigh about 28g low-carbon iron sheet, dissolve in 245g 20% ​​H 2 SO 4 Solution, filter to remove impurities, titrate with potassium dichromate, calculate FeSO 4 concentration, and then the prepared FeSO 4 Solution diluted to 0.1mol / L;

[0054] Step 2. Preparation of δ-FeOOH precursor: take the FeSO prepared above 4 Put 100ml of the solution in a 250ml beaker, add 10ml of 0.04mol / L EDTA solution, adjust the pH to 8.9 with 6mol / L NaOH solution, and use 0.30m 3 .h -1 Air was passed in at a rate of 25°C for 1 hour, filtered and washed with distilled water, and dried at 70°C for 5 hours to obtain the δ-FeOOH precursor;

[0055] Step 2: Take 1 g of the δ-FeOOH precursor prepared above, add Na 2 SiO 3 9H 2 O 95.8mg, citric acid 70mg, add 50ml of distilled water, disperse evenly, adjust the pH to 5, transfer to a polytetrafluoroeth...

Embodiment 3

[0057] A highly active α-Fe 2 o 3 A method for preparing nanosheets, comprising the steps of:

[0058] Step 1. Weigh about 28g of low-carbon iron sheet and dissolve it in 245g of 20% H 2 SO 4 Solution, filter to remove impurities, titrate with potassium dichromate, calculate FeSO 4 concentration, and then the prepared FeSO 4 Solution diluted to 0.3mol / L;

[0059] Step 2. Preparation of δ-FeOOH precursor: take the FeSO prepared above 4 Solution 100ml, put in a 250ml beaker, add 30ml 0.02mol / LEDTA solution, adjust pH to 8.8 with 6mol / L NaOH solution, take 0.28m 3 .h -1 Air was introduced at the rate of 23°C for 1.5h, filtered and washed with distilled water, and dried at 70°C for 5h to obtain the δ-FeOOH precursor;

[0060] Step 2: Take 4 g of the δ-FeOOH precursor prepared above, add Na 2 SiO 3 9H 2 O 83mg, citric acid 30mg, add 50ml of distilled water, disperse evenly, adjust the pH to 3, transfer to a polytetrafluoroethylene-lined stainless steel reactor, react at ...

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Abstract

The invention provides a high-activity alpha-Fe2O3 nano-sheet as well as a preparation method and application thereof. The preparation method of the high-activity alpha-Fe2O3 nano-sheet comprises thefollowing steps: preparing a delta-FeOOH precursor; then adding the delta-FeOOH precursor, dissoluble silicate and citric acids in water, uniformly dispersing, adjusting the pH to 3-7, transferring toa hydro-thermal reactor and reacting for 8-12 hours at a temperature of 150-180 DEG C to obtain the alpha-Fe2O3 nano-sheet; the mass ratio of the dissoluble silicate to the citric acids to the delta-FeOOH precursor is (0.02-0.03):(0.003-0.03):1. The preparation method of the alpha-Fe2O3 nano-sheet is simple, mild in conditions and low in cost, and realizes the control over material topography; the prepared alpha-Fe2O3 nano-sheet has excellent photo-catalytic activity, can effectively degrade refractory phenolic toxic pollutants in sewage and has a better application prospect in the sewage treatment field.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a highly active α-Fe 2 o 3 Nanosheets and their preparation methods and applications. Background technique [0002] α-Fe 2 o 3 Belonging to the corundum structure of the hexagonal system, it is a cheap and environmentally friendly semiconductor material with high stability, narrow band gap energy, strong absorption capacity for visible light, and can absorb 40% of sunlight Light energy can photocatalytically degrade organic pollutants through photo-Fenton reaction. However, the currently prepared α-Fe 2 o 3 The catalytic activity of the material is not ideal. It is well known that the physicochemical properties of materials strongly depend on their size and morphology, by reducing the α-Fe 2 o 3 The particle size, shape change and surface modification can improve the α-Fe 2 o 3 surface activity. Therefore, through morphology control, surface modification,...

Claims

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Application Information

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IPC IPC(8): B01J23/745C02F1/30C02F101/34
CPCB01J23/745C02F1/30C02F2101/345C02F2305/10B01J35/39
Inventor 刘华亭陈汝芬郭羽克童孟丽
Owner HEBEI NORMAL UNIV
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