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Magnetic core-shell bismuth sub-carbonate/sepiolite composite photocatalyst and preparation method thereof

A technology of bismuth oxycarbonate and sepiolite, applied in the field of photocatalytic degradation of organic pollutants, can solve the problems of difficult separation and recovery, low catalytic activity, poor recycling performance and the like

Pending Publication Date: 2021-05-18
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite photocatalyst has a regular core-shell spherical structure, good visible light response performance and magnetic separation performance, and solves the problem of Bi 2 o 2 CO 3 Visible light catalytic activity is not high, separation and recovery difficulties and poor recycling performance

Method used

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  • Magnetic core-shell bismuth sub-carbonate/sepiolite composite photocatalyst and preparation method thereof
  • Magnetic core-shell bismuth sub-carbonate/sepiolite composite photocatalyst and preparation method thereof
  • Magnetic core-shell bismuth sub-carbonate/sepiolite composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Take 5.83g of cetyltrimethylammonium bromide and add it to 128mL of ethylene glycol, stir it ultrasonically for 20 minutes, and prepare cetyltrimethylammonium bromide-ethylene diol with a concentration of 0.125mol / L Alcoholic solution A;

[0034] (2) Take 3.14g of bismuth nitrate pentahydrate with a content of 99.0% and 2.62g of ferric nitrate nonahydrate with a content of 98.5% and add them to 320mL of deionized water at the same time, stir ultrasonically for 20min to dissolve into Bi 3+ The concentration is 0.020mol / L, Fe 3+ Concentration is the bismuth nitrate-iron nitrate mixed solution B of 0.020mol / L;

[0035] (3) Slowly add the mixed solution B prepared in step (2) to the solution A prepared in step (1), stir ultrasonically for 15 minutes, then adjust the pH to 10.5 with 10mol / L KOH solution, and continue ultrasonically stirring at room temperature 4h, to obtain mixture C;

[0036] (4) Take 1.79g of Fe with a particle size of about 500nm 3 o 4 @SiO 2 Th...

Embodiment 2

[0039] (1) Take 5.83g of cetyltrimethylammonium bromide and add it to 107mL of ethylene glycol, stir it ultrasonically for 25 minutes, and prepare cetyltrimethylammonium bromide-ethylene diol with a concentration of 0.15mol / L Alcoholic solution A;

[0040] (2) Take 3.14g of bismuth nitrate pentahydrate with a content of 99.0% and 2.57g of ferric nitrate nonahydrate with a content of 98.5% and add them to 256mL of deionized water at the same time, and ultrasonically stir for 25min to dissolve into Bi 3+ The concentration is 0.025mol / L, Fe 3+ Concentration is the bismuth nitrate-iron nitrate mixed solution B of 0.024mol / L;

[0041](3) Slowly add the mixed solution B prepared in step (2) to the solution A prepared in step (1), stir ultrasonically for 20min, then adjust the pH to 10.0 with 10mol / L KOH solution, and continue ultrasonically stirring at room temperature 3.5h, to obtain mixture C;

[0042] (4) Take 1.57g of Fe with a particle size of about 500nm 3 o 4 @SiO 2 The...

Embodiment 3

[0045] (1) Take 5.83g of cetyltrimethylammonium bromide and add it to 80mL of ethylene glycol, stir it ultrasonically for 30min, and prepare cetyltrimethylammonium bromide-ethylene diol with a concentration of 0.20mol / L Alcoholic solution A;

[0046] (2) Take 3.14g of bismuth nitrate pentahydrate with a content of 99.0% and 2.49g of ferric nitrate nonahydrate with a content of 98.5% and add them to 213mL of deionized water at the same time, stir ultrasonically for 25min to dissolve into Bi 3+ The concentration is 0.030mol / L, Fe 3+ Concentration is the bismuth nitrate-iron nitrate mixed solution B of 0.029mol / L;

[0047] (3) Slowly add the mixed solution B prepared in step (2) to the solution A prepared in step (1), stir ultrasonically for 20min, then adjust the pH to 9.8 with 8mol / L KOH solution, and continue ultrasonically stirring at room temperature 3h, to obtain mixture C;

[0048] (4) Take 1.41g of Fe with a particle size of about 450nm 3 o 4 @SiO 2 The microspheres...

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Abstract

The invention relates to a magnetic core-shell bismuth sub-carbonate / sepiolite composite photocatalyst and a preparation method thereof. The preparation method comprises the following steps: dissolving cetyl trimethyl ammonium bromide (CTAB) in ethylene glycol (EG) to prepare a CTAB-EG solution as a template agent and a reducing agent, taking a bismuth nitrate-ferric nitrate solution as a raw material, adjusting the pH value, sequentially adding magnetic core-shell type Fe3O4@SiO2 microspheres and purified sepiolite, fully mixing, and carrying out a hydrothermal reaction to generate the shape-controllable core-shell type bismuth sub-carbonate / sepiolite composite photocatalyst. EG or CTAB is oxidized and decomposed under a hydrothermal condition to generate carbonate radicals, and the structure and morphology of the product are effectively controlled through the surface activity and template action of CTAB and the interfacial effect of sepiolite, so that the recombination rate of an energy band gap and a photon-generated carrier is reduced, the absorption and utilization rate of visible light and the adsorption performance on organic matters are improved, the catalyst is endowed with excellent magnetic separation performance, and the photocatalytic activity and the separation recovery and recycling performance of the catalyst are improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic degradation of organic pollutants, in particular to a magnetic core-shell type bismuth oxycarbonate / sepiolite composite photocatalyst and a preparation method thereof. Background technique [0002] The discharge of organic matter such as organic dyes and antibiotics into the environment has caused serious pollution to the ecological environment and constituted an increasingly serious threat to human health, which has become a serious global environmental problem. Aiming at these pollutions, people have developed a variety of treatment methods, such as adsorption, ion exchange, reverse osmosis, biodegradation, chemical oxidation, advanced oxidation, photocatalytic degradation, etc. Among them, the photocatalytic degradation method uses light energy to excite the catalyst to generate photogenerated carriers to degrade pollutants. It can be realized by artificial or natural light. It is conven...

Claims

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Application Information

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IPC IPC(8): B01J27/232B01J35/02B01J35/10C02F1/30C02F101/30C02F101/38
CPCB01J27/232C02F1/30C02F2305/10C02F2101/30C02F2101/40B01J35/396B01J35/39B01J35/33B01J35/40B01J35/615
Inventor 刘立华粟刚董文豪匡秋娟唐安平刘星薛建荣
Owner HUNAN UNIV OF SCI & TECH