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A kind of selenium, nitrogen co-doped biochar catalytic material and its preparation method and application

A catalytic material, co-doping technology, applied in the field of chemical materials, to achieve the effect of improving cost-effectiveness, reducing loading, and high electron transfer capacity

Active Publication Date: 2021-12-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reduction of selenium is carried out inside the microbial cell, and the whole reduction process takes a long time (>10d) to transport nano-selenium outside the cell for resource utilization

Method used

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  • A kind of selenium, nitrogen co-doped biochar catalytic material and its preparation method and application
  • A kind of selenium, nitrogen co-doped biochar catalytic material and its preparation method and application
  • A kind of selenium, nitrogen co-doped biochar catalytic material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0050] Present embodiment 1 provides a kind of preparation method of selenium, nitrogen co-doped biochar catalytic material, it comprises the following steps:

[0051] (1) Inoculate the Bacillus megaterium B-10 thallus stored on the LB slope into the LB liquid medium, and expand the culture for 12 hours at a temperature of 30° C. to obtain the seed liquid of Bacillus megaterium B-10; wherein the LB liquid culture The ratio of each component of the base is: peptone 10g, yeast powder 5g, sodium chloride 10g, distilled water 1L; the LB slope is based on the above formula by adding 15g / L agar;

[0052] (2) Na 2 SeO 3 Add to LB medium for bioreduction, add Na 2 SeO 3 The final concentration is 1.7g / L, and the bioreduction time is 24h. After reduction, centrifuge at 7,000rpm for 5min to obtain the Bio-Se bacterial precursor;

[0053] (3) adding 0.4 times the wet weight of the Bio-Se bacterial precursor to the obtained Bio-Se bacterial precursor ammonium chloride as a nitrogen so...

Embodiment 2

[0058] (1) Cultivate according to steps (1) and (2) in Example 1 to obtain the seed liquid of Bacillus megaterium B-10.

[0059] (2) Na 2 SeO 3 Add to sterile medium for bioreduction, add Na 2 SeO 3 The final concentration is 1g / L, and the bioreduction time is 12h. After reduction, centrifuge at 7,000rpm for 5min to obtain the Bio-Se bacterial precursor;

[0060] (3) Add ammonium chloride of 0.5 times the wet weight of the cell to the obtained Bio-Se bacterial precursor as a nitrogen source for mixing, and obtain a Se / N composite bacterial precursor after vacuum freeze-drying;

[0061] (4) The obtained Se / N composite bacterial precursor is subjected to a pyrolysis reaction under an inert atmosphere to obtain a selenium and nitrogen co-doped biochar catalytic material. The atmosphere of the pyrolysis treatment is a nitrogen atmosphere, and the temperature is 700 ° C. Carbonization The treatment time is 3h, and the heating rate is 5°C / min;

[0062] According to the step of ...

Embodiment 3

[0064] (1) Cultivate according to steps (1) and (2) in Example 1 to obtain the seed liquid of Bacillus megaterium B-10.

[0065] (2) Na 2 SeO 3 Add to sterile medium for bioreduction, add Na 2 SeO 3 The final concentration is 0.5g / L, and the bioreduction time is 12h. After reduction, centrifuge at 7,000rpm for 5min to obtain the Bio-Se bacterial precursor;

[0066] (3) Add ammonium chloride of 0.5 times the wet weight of the cell to the obtained Bio-Se bacterial precursor as a nitrogen source for mixing, and obtain a Se / N composite bacterial precursor after vacuum freeze-drying;

[0067] (4) The obtained Se / N composite bacterial precursor is subjected to a pyrolysis reaction under an inert atmosphere to obtain a selenium and nitrogen co-doped biochar catalytic material. The atmosphere of the pyrolysis treatment is a nitrogen atmosphere, and the temperature is 800 ° C. The treatment time is 2h, and the heating rate is 5°C / min;

[0068] According to the step of using the cata...

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Abstract

The invention discloses a selenium and nitrogen co-doped biochar catalytic material as well as a preparation method and application thereof. The present invention utilizes the biological detoxification effect of bacteria (Bacillus megaterium B-10, preservation number CGMCC No.15753) to reduce highly toxic selenite to low-toxic biological nano-selenium, and then uses selenium-enriched bacteria as the carbon of biochar A new type of selenium and nitrogen co-doped biochar catalytic material was prepared by a simple one-step carbonization method by adding a nitrogen source. The preparation method of the selenium and nitrogen co-doped biochar proposed by the invention is simple, convenient, safe, cheap and easy to control, and can be produced on a large scale. At the same time, the reduction of high-valent selenium by bacteria can quickly detoxify selenite pollutants, which has the advantage of being environmentally friendly. In addition, the biochar can effectively degrade refractory organics or pollutants by activating monopersulfate, and the removal effect is good. The reaction speed is fast, and the application prospect in the field of wastewater restoration is very broad.

Description

technical field [0001] The invention belongs to the fields of chemical materials and pollutant treatment, and in particular relates to a selenium and nitrogen co-doped biochar catalytic material and a preparation method thereof, as well as an application in catalytically activating monopersulfate to degrade pollutants. Background technique [0002] The ever-increasing demand for water cleaning has motivated great efforts to develop advanced technologies for the removal of recalcitrant organic pollutants in water. Recently, persulfate-based advanced oxidation methods have attracted great interest because of their ability to generate powerful hydroxyl ( OH), sulfate (SO 4·– ) or produce two free radicals simultaneously. The monopersulfate (PMS) oxidation process has high oxidation potential and wide adaptability, which can overcome the shortcomings of the traditional Fenton process, such as narrow pH range, excessive iron slag, and high storage and transportation costs. To d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/08B01J37/16B01J37/32B01J37/36C02F1/72C02F101/34
CPCB01J27/24B01J35/1019B01J35/1061B01J37/084B01J37/16B01J37/32B01J37/36C02F1/725C02F2101/345
Inventor 石岩张可菁史美清司梦莹柴立元杨志辉
Owner CENT SOUTH UNIV
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