Bismuth ferrite/sepiolite composite visible-light-driven photocatalyst and preparation method thereof

A technology of sepiolite and bismuth ferrite, applied in the field of photocatalytic degradation of organic pollutants

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

At present, there is no relevant literature disclosing BiFeO 3 / Sepiolite composite photocatalyst and preparation method thereof

Method used

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  • Bismuth ferrite/sepiolite composite visible-light-driven photocatalyst and preparation method thereof
  • Bismuth ferrite/sepiolite composite visible-light-driven photocatalyst and preparation method thereof
  • Bismuth ferrite/sepiolite composite visible-light-driven photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) get 2.70g content and be that 99.0% bismuth nitrate pentahydrate is dissolved in 110mL deionized water to prepare Fe 3+ Concentration is 0.050mol / L solution, then take 2.26g ferric nitrate content is 98.5% and dissolve in 122mL deionized water to prepare Bi 3+ The concentration is 0.045mol / L solution; the two solutions are mixed, ultrasonically stirred for 2 hours, and bismuth nitrate-ferric nitrate solution A is obtained.

[0034] (2) Adjust the pH to 13.5 with 8 mol / L KOH solution, and continue ultrasonic stirring at room temperature for 2 hours to obtain mixture B;

[0035] (3) Add 0.27g of purified sepiolite to mixture B, and ultrasonically stir for 1.5h to obtain mixture C;

[0036] (4) Transfer the mixture C prepared in step (3) into a high-pressure reactor, and the reaction time at 200°C is 6h; cool to room temperature, filter, and wash the filter residue 3 times with deionized water and ethanol respectively, and heat it at 80°C After drying to constant wei...

Embodiment 2

[0039] (1) Get 2.70g of bismuth nitrate pentahydrate with a content of 99.0% and dissolve it in 100mL0.1mol / L dilute nitric acid to prepare Bi 3+ The concentration is 0.055mol / L solution, then take 2.21g ferric nitrate with a content of 98.5% and dissolve it in 108mL0.1mol / L dilute nitric acid to prepare Fe 3+ The concentration is 0.050 mol / L solution; the two solutions are mixed and ultrasonically stirred for 1.5 hours to obtain bismuth nitrate-ferric nitrate solution A.

[0040] (2) Use 8mol / L KOH solution to adjust the pH to 13.0, and continue ultrasonic stirring at room temperature for 1.5h to obtain mixture B;

[0041] (3) Add 0.22 g of purified sepiolite to mixture B, and ultrasonically stir for 1.5 h to obtain mixture C;

[0042] (4) Transfer the mixture C prepared in step (3) into a high-pressure reactor, and the reaction time is 7h at 190°C; cool to room temperature, filter, and wash the filter residue 4 times with deionized water and ethanol, and then wash it at 75°...

Embodiment 3

[0045] (1) 2.70g content of 99.0% bismuth nitrate pentahydrate was dissolved in 92mL deionized water to prepare Bi 3+ Concentration is 0.060mol / L solution, then take 2.21g ferric nitrate with content of 98.5% and dissolve it in 95mL deionized water to prepare Fe 3+ The concentration is 0.055mol / L solution; the two solutions are mixed and stirred ultrasonically for 1 hour to obtain bismuth nitrate-ferric nitrate solution A.

[0046] (2) Adjust the pH to 12.6 with 6mol / L KOH solution, and continue ultrasonic stirring at room temperature for 1 hour to obtain mixture B;

[0047] (3) Add 0.54 g of purified sepiolite to mixture B, and ultrasonically stir for 1 hour to obtain mixture C;

[0048] (4) Transfer the mixture C prepared in step (3) to a high-pressure reactor, and the reaction time is 8h at 180°C; cool to room temperature, filter, and wash the filter residue 4 times with deionized water and ethanol, Dry to constant weight to obtain 2.20 g of bismuth ferrite / sepiolite comp...

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Abstract

The invention relates to a bismuth ferrite / sepiolite composite visible-light-driven photocatalyst and a preparation method thereof. The preparation method comprises the following steps: by taking soluble bismuth salt and ferric salt as raw materials, fully mixing solutions of the two raw materials, regulating the pH value of the solution by using strong base, adding treated purified sepiolite, performing ultrasonic stirring and full mixing, transferring the treated system into a polytetrafluoroethylene autoclave, and performing hydrothermal reaction, so as to generate the porous bismuth ferrite / sepiolite composite visible-light-driven photocatalyst which is based on sepiolite and has good morphology. Bismuth ferrite is generated on line in the presence of sepiolite, and the structure and morphology of the generated bismuth ferrite are effectively regulated and controlled under the combined action of rich oxygen-containing groups on the surface of the sepiolite and an interfacial effect, so that the component integration and the material stability in the prepared bismuth ferrite / sepiolite composite visible-light-driven photocatalyst are improved, the recombination rate of an energy band gap and a photon-generated carrier is reduced, and the absorption and utilization rate of visible light, the adsorption performance on organic pollutants and the visible light catalytic degradation performance and mineralization effect on the organic pollutants are improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic degradation of organic pollutants, in particular to a bismuth ferrite / sepiolite composite visible light catalyst and a preparation method thereof. Background technique [0002] With the rapid development of the printing and dyeing industry, various dyes are widely used, resulting in a large amount of dye-containing wastewater being discharged into the environment. Due to its complex structure, difficult degradation, high toxicity, and bright colors, printing and dyeing can easily cause serious pollution to the ecological environment and pose a serious threat to human health when discharged into the environment. A variety of printing and dyeing wastewater treatment technologies have been developed, such as adsorption, reverse osmosis, biodegradation, chemical oxidation, advanced oxidation and photocatalytic degradation. Among them, photocatalytic degradation technology uses light energy to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/843B01J35/10C02F1/30C02F101/30C02F101/38
CPCB01J23/8437B01J35/004C02F1/30B01J35/1014C02F2305/10C02F2101/30C02F2101/38
Inventor 刘立华粟刚牛梦媛匡秋娟唐安平刘星薛建荣
Owner HUNAN UNIV OF SCI & TECH
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