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Red-mud-based molecular-sieve-oaded titanium dioxide/ferric oxide composite photocatalytic material and preparation method and application thereof

A technology of ferric oxide and composite photocatalysis, applied in molecular sieve catalysts, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of high electron and hole recombination efficiency, narrow band gap, etc. , accelerate the oxidation rate, accelerate the effect of catalytic degradation

Pending Publication Date: 2021-10-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fe 2 o 3 The disadvantages of semiconductor photocatalysts are narrow band gap and high recombination efficiency of electrons and holes, so there is no large-scale treatment of Fe in red mud. 2 o 3 for recycling

Method used

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  • Red-mud-based molecular-sieve-oaded titanium dioxide/ferric oxide composite photocatalytic material and preparation method and application thereof
  • Red-mud-based molecular-sieve-oaded titanium dioxide/ferric oxide composite photocatalytic material and preparation method and application thereof
  • Red-mud-based molecular-sieve-oaded titanium dioxide/ferric oxide composite photocatalytic material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039](1) Dry the original untreated red mud in an oven at 60°C for 24 hours, then grind and pass through a 150-mesh sieve to obtain a red mud material with uniform particle size, then wash it with deionized water and alcohol, and then Dry in an oven at 60°C and treat with dilute sulfuric acid with a concentration of 1mol / L. Dissolve every 5g of red mud in 15mL of sulfuric acid, then add 100mL of deionized water for stirring, and dry to obtain acidified red mud material.

[0040] (2) Add 2 g of cetyltrimethylammonium bromide into 100 mL of deionized water, and stir thoroughly for 20 minutes to form solution A.

[0041] (3) Add 4 g of acidified red mud into solution A, and stir for 20 minutes to obtain mixed solution B of red mud and cetyltrimethylammonium bromide.

[0042] (4) Add 8mL, 10mol / L NH 3 ·H 2 O solution, and 10 mL of tetraethyl orthosilicate solution was added thereto, and then fully stirred at 25° C. for 2 hours under the action of a magnetic stirrer to obtain cl...

Embodiment 2

[0052] (1) Dry the original untreated red mud in an oven at 60°C for 24 hours, then grind and pass through a 150-mesh sieve to obtain a red mud material with uniform particle size, then wash it with deionized water and alcohol, and then Dry in an oven at 60°C, and treat with dilute sulfuric acid with a concentration of 2mol / L. Dissolve every 5g of red mud in 15mL of sulfuric acid, then add 100mL of deionized water for stirring, and dry to obtain acidified red mud material.

[0053] (2) Add 3 g of cetyltrimethylammonium bromide into 150 mL of deionized water, and stir thoroughly for 20 minutes to form solution A.

[0054] (3) Add 5 g of acidified red mud into solution A, and stir for 20 minutes to obtain mixed solution B of red mud and cetyltrimethylammonium bromide.

[0055] (4) Add 8mL, 11mol / L NH 3 ·H 2 O solution, and 10 mL of tetraethyl orthosilicate solution was added thereto, and then fully stirred at 25° C. for 2 hours under the action of a magnetic stirrer to obtain ...

Embodiment 3

[0062] (1) Dry the original untreated red mud in an oven at 60°C for 24 hours, then grind and pass through a 150-mesh sieve to obtain a red mud material with uniform particle size, then wash it with deionized water and alcohol, and then Dried in an oven at 60°C, treated with dilute sulfuric acid with a concentration of 3mol / L, dissolved every 5g of red mud in 15mL of sulfuric acid, then added 100mL of deionized water for stirring, and dried to obtain an acidified red mud material.

[0063] (2) Add 4 g of cetyltrimethylammonium bromide into 200 mL of deionized water, and stir thoroughly for 30 minutes to form solution A.

[0064] (3) Add 6 g of acidified red mud into solution A, and stir for 30 minutes to obtain mixed solution B of red mud and cetyltrimethylammonium bromide.

[0065] (4) Add 10mL, 12mol / L NH 3 ·H 2 O solution, and 13 mL of tetraethyl orthosilicate solution was added thereto, and then fully stirred at 25° C. for 2 hours under the action of a magnetic stirrer t...

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Abstract

The invention provides a red-mud-based molecular-sieve-loaded titanium dioxide / ferric oxide composite photocatalytic material and a preparation method and application thereof. The method comprises the following steps: step 1, sequentially subjecting red mud to acidifying and drying to obtain acid-activated red mud; step 2, uniformly mixing the acid-activated red mud and a cetyltrimethylammonium bromide solution to obtain a mixed system A, adding an NH3.H2O solution and tetraethoxysilane into the mixed system A, and performing uniform mixing to obtain a mixed system B; step 3, centrifuging the mixed system B, drying precipitate, and performing roasting to obtain silicon dioxide loaded with ferric oxide; and step 4, uniformly mixing the silicon dioxide loaded with ferric oxide, ethanol, glycerol and tetrabutyl titanate, then performing hydrothermal reaction, then separating precipitate in obtained reaction liquid, and then performing drying to obtain a molecular-sieve-loaded titanium dioxide / ferric oxide composite photocatalytic material.

Description

technical field [0001] The invention relates to the technical field of photocatalytic material preparation, in particular to a red mud-based molecular sieve-loaded titanium dioxide / ferric oxide composite photocatalytic material, a preparation method and an application. Background technique [0002] With the development of living standards and science and technology, fossil fuels are constantly being consumed, resulting in wastewater pollution and accumulation of solid waste, causing great harm to the environment. [0003] Aluminum enterprises will produce a large amount of solid waste red mud when producing aluminum, which contains more semiconductor materials, such as Fe 2 o 3 . Fe 2 o 3 The disadvantages of semiconductor photocatalysts are narrow band gap and high recombination efficiency of electrons and holes, so there is no large-scale treatment of Fe in red mud. 2 o 3 for recycling. Contents of the invention [0004] Aiming at the problems existing in the prio...

Claims

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Application Information

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IPC IPC(8): B01J29/03B01J29/035B01J35/00C02F1/30C02F1/72C02F101/38
CPCB01J29/03B01J29/0356C02F1/30C02F1/725C02F2305/023C02F2305/10C02F2101/40B01J35/39
Inventor 杨艳玲李道辉郭文宁侯小江孙宜孟叶晓慧安东东冯雷锁国权张荔
Owner SHAANXI UNIV OF SCI & TECH
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