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Ion-modified red mud-based heterojunction photocatalyst and preparation method and application thereof

A technology of ion modification and photocatalysis, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc.

Pending Publication Date: 2021-11-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides an ion-modified red mud-based heterojunction photocatalyst and its preparation method and application, which solves the problem of massive accumulation of solid waste and turns solid waste into Treasure, to achieve the effect of recycling

Method used

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  • Ion-modified red mud-based heterojunction photocatalyst and preparation method and application thereof
  • Ion-modified red mud-based heterojunction photocatalyst and preparation method and application thereof
  • Ion-modified red mud-based heterojunction photocatalyst and preparation method and application thereof

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preparation example Construction

[0027] A method for preparing an ion-modified red mud-based heterojunction photocatalyst of the present invention comprises the following steps:

[0028] Step 1: Dry the red mud in an oven at 60-80°C for 24-48 hours, grind it, pass through a 150-mesh sieve, and then acidify it in 5-15mL of sulfuric acid solution with a concentration of 1-5mol / L, and then dry it to obtain Acid-activated red mud. After acidification, Fe in red mud 2 o 3 The content of other basic oxides decreased while the content of other basic oxides decreased.

[0029] Step 2: Dissolve 4-8g of cetyltrimethylammonium bromide in 100mL-300mL of deionized water to obtain solution A.

[0030] Step 3: Then dissolve 2-5g of cobalt nitrate into solution A and stir for 20 minutes to obtain solution B.

[0031] Step 4: Then add 4-8g of acid-activated red mud to solution B, and then stir evenly, usually for 20 minutes, to form a cloudy liquid C, which can mix and stir cobalt nitrate and red mud evenly.

[0032] Ste...

Embodiment 1

[0038] A method for preparing an ion-modified red mud-based heterojunction photocatalyst of the present invention comprises the following steps:

[0039] Step 1: Dry the red mud in an oven at 60°C for 24 hours, grind it, pass through a 150-mesh sieve, and then acidify it in 5 mL of sulfuric acid solution with a concentration of 1 mol / L, and then dry it to obtain acid-activated red mud. The material after acidification will make Fe in the red mud 2 o 3 The content of other basic oxides decreased while the content of other basic oxides decreased.

[0040] Step 2: 4 g of cetyltrimethylammonium bromide was dissolved in 100 mL of deionized water to obtain solution A.

[0041] Step 3: Then dissolve 2g of cobalt nitrate into solution A and stir for 20 minutes to obtain solution B.

[0042] Step 4: Then add 4g of acid-activated red mud to solution B, and then stir evenly, usually for 20 minutes, to form a cloudy liquid C, which can mix and stir cobalt nitrate and red mud evenly.

...

Embodiment 2

[0051] A method for preparing an ion-modified red mud-based heterojunction photocatalyst of the present invention comprises the following steps:

[0052] Step 1: Dry the red mud in an oven at 60°C for 24 hours, grind it, pass through a 150-mesh sieve, and then acidify it in 5 mL of sulfuric acid solution with a concentration of 2 mol / L, and then dry it to obtain acid-activated red mud. The material after acidification will make Fe in the red mud 2 o 3 The content of other basic oxides decreased while the content of other basic oxides decreased.

[0053] Step 2: 4 g of cetyltrimethylammonium bromide was dissolved in 150 mL of deionized water to obtain solution A.

[0054] Step 3: Then dissolve 3g of cobalt nitrate into solution A, and stir for 20 minutes to obtain solution B.

[0055] Step 4: Then add 5 g of acid-activated red mud to solution B, and then stir evenly, generally for 20 minutes, to form a cloudy liquid C, which can mix and stir cobalt nitrate and red mud evenly...

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Abstract

The invention provides an ion-modified red-mud-based heterojunction photocatalyst and a preparation method and application thereof. The method comprises the following steps: step 1, sequentially acidifying and drying red mud to obtain acid-activated red mud; step 2, uniformly mixing the acid-activated red mud, hexadecyl trimethyl ammonium bromide and cobalt nitrate in deionized water according to a mass ratio of (4-8): (4-8): (2-5) to obtain a turbid solution; and step 3, firstly adding a sodium silicate solution into the turbid solution to obtain a mixed system, then adjusting the pH value of the mixed system to 2-4 to obtain a colloidal body, firstly freezing the colloidal body, then freeze-drying to obtain a mixture, and finally roasting the mixture at 500-800 DEG C to obtain the ion-modified red mud-based heterojunction photocatalyst.

Description

technical field [0001] The invention relates to the field of photocatalytic degradation of organic pollutants and solid waste resource utilization, in particular to an ion-modified red mud-based heterojunction photocatalyst and its preparation method and application. Background technique [0002] How to utilize red mud has always been a widely concerned issue, because red mud is a material with strong utilization value, which contains a large amount of iron oxide, iron oxide is a photocatalyst, and has good electron transport efficiency, So how to use iron oxide is the focus of scientific and technological workers. [0003] As the protection of the environment becomes more and more stringent, the problem of sewage pollution needs to be solved urgently. Using photocatalysts to treat sewage is a simple and efficient method, which can not only save resources, protect the environment, but also efficiently recycle light. Catalyst, can save resources. Photocatalysis uses light e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75C02F1/30C02F101/38
CPCB01J23/75C02F1/30C02F2305/10C02F2101/40B01J35/39
Inventor 杨艳玲李道辉孙宜孟郭文宁侯小江和茹梅安东东冯雷锁国权张荔叶晓慧
Owner SHAANXI UNIV OF SCI & TECH
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