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Bismuth subcarbonate/sepiolite composite photocatalyst and preparation method thereof

A technology of bismuth oxycarbonate and sepiolite, which is applied in the field of photocatalytic degradation of organic pollutants, and can solve problems such as Sepiolite composite photocatalysts that have not yet been developed

Active Publication Date: 2021-05-11
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, no Bi 2 o 2 CO 3 / Sepiolite Composite Photocatalyst Research Report

Method used

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  • Bismuth subcarbonate/sepiolite composite photocatalyst and preparation method thereof
  • Bismuth subcarbonate/sepiolite composite photocatalyst and preparation method thereof
  • Bismuth subcarbonate/sepiolite composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Take 5.47g of cetyltrimethylammonium bromide and add it to 120mL of ethylene glycol, stir it ultrasonically for 20 minutes, and prepare cetyltrimethylammonium bromide-ethylene diethyl ammonium bromide with a concentration of 0.125mol / L Alcoholic solution A;

[0033] (2) Take 2.94g of bismuth nitrate pentahydrate with a content of 99.0% and 2.46g of ferric nitrate nonahydrate with a content of 98.5% and add them to 300mL of deionized water at the same time, stir ultrasonically for 20min to dissolve into Bi 3+ The concentration is 0.02mol / L, Fe 3+ Concentration is the bismuth nitrate-iron nitrate mixed solution B of 0.020mol / L;

[0034] (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;

[0035] (4) Add 0.24 g of purified sepiolite to the mixture C ob...

Embodiment 2

[0038] (1) Take 5.47g of cetyltrimethylammonium bromide and add it to 100mL of ethylene glycol, stir it ultrasonically for 25 minutes, and prepare cetyltrimethylammonium bromide-ethylene diethyl ammonium bromide with a concentration of 0.15mol / L Alcoholic solution A;

[0039] (2) Take 2.94g of bismuth nitrate pentahydrate with a content of 99.0% and 2.41g of ferric nitrate nonahydrate with a content of 98.5% and add them to 240mL of deionized water at the same time, stir ultrasonically 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;

[0040] (3) Slowly add the mixed solution B prepared in step (2) dropwise to the solution A prepared in step (1), stir ultrasonically for 20min, then adjust the pH to 10.3 with 12mol / L KOH solution, and continue ultrasonically stirring at room temperature 3.5h, to obtain mixture C;

[0041] (4) Add 0.29 g of purified sepiolite to the mixtur...

Embodiment 3

[0044] (1) Take 5.47g of cetyltrimethylammonium bromide and add it to 75mL of ethylene glycol, stir it ultrasonically for 30 minutes, and prepare cetyltrimethylammonium bromide-ethylene diol with a concentration of 0.20mol / L Alcoholic solution A;

[0045] (2) Take 2.94g of bismuth nitrate pentahydrate with a content of 99.0% and 2.34g of ferric nitrate nonahydrate with a content of 98.5% and add them to 200mL 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 0.0285mol / L;

[0046] (3) Slowly add the mixed solution B prepared in step (2) to the solution A prepared in step (1), stir ultrasonically for 25min, then adjust the pH to 10.1 with 11mol / L KOH solution, and continue ultrasonically stirring at room temperature 3h, to obtain mixture C;

[0047] (4) Add 0.59 g of purified sepiolite to the mixture C obtained in step (3), and u...

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Abstract

The invention relates to a bismuth subcarbonate / sepiolite composite photocatalyst and a preparation method thereof. The preparation method comprises the following steps: dissolving cetyltrimethylammonium bromide (CTAB) in ethylene glycol (EG) to prepare a CTAB-EG solution serving as a template agent and a reducing agent, adding a bismuth nitrate-ferric nitrate solution, adjusting the pH value of the mixed solution by using a strong alkali solution, adding purified sepiolite, fully conducting mixing, transferring the treated system into a polytetrafluoroethylene autoclave, and carrying out hydrothermal reaction to generate the porous bismuth subcarbonate / sepiolite composite photocatalyst with controllable morphology. EG or CTAB is oxidized and decomposed under a hydrothermal condition to generate carbonate, and bismuth subcarbonate is loaded and grown on sepiolite under the combined action of the surface activity and template action of CTAB and the interfacial effect of sepiolite, so that the structure and morphology of the bismuth subcarbonate can be effectively controlled, the recombination rate of an energy band gap and a photon-generated carrier is reduced, and the absorption and utilization rate of visible light and the adsorption performance on organic matters are improved, so that the photocatalytic degradation performance and the mineralization capability are improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic degradation of organic pollutants, in particular to a bismuth oxycarbonate / sepiolite composite photocatalyst and a preparation method thereof. Background technique [0002] The rapid development of industrial and agricultural production and the continuous improvement of people's living standards have led to an increase in the discharge of organic pollutants into the environment, and the pollution of the water environment has become increasingly serious. So far, people have developed a variety of treatment technologies to deal with the increasingly serious organic pollution, such as adsorption, flocculation, electrochemical methods, chemical reagent oxidation, ozone oxidation, Fenton oxidation, photo-Fenton oxidation and photocatalytic degradation. Among many treatment methods, photocatalytic degradation can use light energy to oxidize and decompose organic pollutants at room temperature. It...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/232C02F1/30C02F101/30C02F101/38
CPCB01J27/232C02F1/30C02F2305/10C02F2101/40C02F2101/38C02F2101/30C02F2101/308B01J35/39
Inventor 刘立华粟刚匡秋娟刘星唐安平薛建荣
Owner HUNAN UNIV OF SCI & TECH
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