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Preparation method of bismuth tungstate nitrogen and sulfur co-modified biochar

A technology of biochar and bismuth tungstate, applied in chemical instruments and methods, catalyst activation/preparation, chemical/physical processes, etc., can solve problems such as poor photocatalytic activity and easy recombination of photogenerated electrons and holes

Pending Publication Date: 2020-08-14
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there exists Bi 2 WO 6 The photogenerated electrons and holes are easy to recombine, resulting in poor photocatalytic activity and other problems.

Method used

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  • Preparation method of bismuth tungstate nitrogen and sulfur co-modified biochar
  • Preparation method of bismuth tungstate nitrogen and sulfur co-modified biochar
  • Preparation method of bismuth tungstate nitrogen and sulfur co-modified biochar

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preparation example Construction

[0035] The embodiment of the present invention provides a preparation method of bismuth tungstate nitrogen and sulfur co-modified biochar, which includes the following steps:

[0036] S1. The biochar raw material is infiltrated and modified with thiourea, and the modified material is placed in nitrogen to react to obtain nitrogen and sulfur doped modified biochar NSBC;

[0037] S2, using ethylene glycol as a solvent to prepare a mixed solution of sodium oleate and bismuth nitrate pentahydrate;

[0038] S3. Add sodium tungstate dihydrate to the mixed solution of sodium oleate and bismuth nitrate;

[0039] S4, adding the nitrogen-sulfur-doped modified biochar NSBC obtained in step S1 to the mixed solution obtained in step S3;

[0040] S5, reacting the mixed solution obtained in step S4;

[0041] S6. Obtain the reactant solid obtained after the reaction in step S5;

[0042] S7. Dry the reactant solid to obtain bismuth tungstate nitrogen and sulfur co-modified biochar Bi 2 WO 6 / NSBC.

[0043]...

Embodiment 1

[0055] Collect fresh corn stalks, clean the surface silt with distilled water, then dry, pulverize with a grinder, pass through a 60-mesh sieve, drop two drops of dilute nitric acid for 20h, dry in an oven at 80℃, take 8g Thiourea was dissolved in 50mL of distilled water, added 4g of dried corn stalks and fully stirred for 1 hour, dried at 80℃, and the modified material was placed in a porcelain crucible, in a vacuum muffle furnace with nitrogen gas for 600 Reaction at ℃ for 3h, after cooling, NSBC-1 was obtained; meanwhile, 4mmol of sodium oleate was dissolved in 40mL of ethylene glycol, and 4mmol of bismuth nitrate pentahydrate was added when sodium oleate was completely dissolved; 2mmol of sodium tungstate dihydrate was heated at 60℃ Dissolve it in 20mL ethylene glycol, and add it to the mixed solution of sodium oleate and bismuth nitrate after it is completely dissolved and stir for 30 minutes; take 0.05g of NSBC-1 prepared in the first step and dissolve it in 10mL ethylene ...

Embodiment 2

[0058] Collect fresh corn stalks, clean the surface sediment with distilled water, then dry, pulverize it with a pulverizer, pass through a 60-mesh sieve, drop two drops of dilute nitric acid for 20h, dry in an oven at 80℃, take 6g Thiourea was dissolved in 50mL of distilled water, added 4g of dried corn stalks and fully stirred for 1 hour, dried at 80℃, and the modified material was placed in a porcelain crucible, in a vacuum muffle furnace with nitrogen gas for 600 Reaction at ℃ for 3h, after cooling, NSBC-2 was obtained; at the same time, 4mmol of sodium oleate was dissolved in 40mL of ethylene glycol, and 4mmol of bismuth nitrate pentahydrate was added when sodium oleate was completely dissolved; 2mmol of sodium tungstate dihydrate was heated at 60℃ Dissolve it in 20mL ethylene glycol under the condition, add sodium oleate and bismuth nitrate mixed solution after it is completely dissolved and stir for 30min; take 0.05g of NSBC-2 prepared in the first step and dissolve it in...

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Abstract

A preparation method of bismuth tungstate nitrogen and sulfur co-modified biochar is disclosed and comprises the following steps: S1, carrying out infiltration modification on a biochar raw material with thiourea, and placing the modified material in nitrogen for a reaction so as to obtain nitrogen and sulfur doped modified biochar, S2, preparing a mixed solution of sodium oleate and bismuth nitrate pentahydrate by taking ethylene glycol as a solvent, S3, adding sodium tungstate dehydrate into the mixed solution of sodium oleate and bismuth nitrate, S4, adding the nitrogen-sulfur doped modified biochar obtained in the step S1 into the mixed solution obtained in the step S3, S5, enabling the mixed solution obtained in the step S4 to react, S6, obtaining a reactant solid obtained after the reaction in the step S5, and S7, drying the reactant solid to obtain the bismuth tungstate nitrogen and sulfur co-modified biochar. The bismuth tungstate nitrogen and sulfur co-modified biochar can promote adsorption of organic matters and heavy metals and improve the photocatalytic performance.

Description

Technical field [0001] The invention relates to a method for modifying biochar, in particular to a method for preparing bismuth tungstate nitrogen and sulfur co-modified biochar. Background technique [0002] With the continuous improvement of agricultural mechanization, the world's food production is increasing, and the accompanying agricultural waste disposal is facing great challenges. In Northeast China, there are regulations prohibiting the burning of straw on the spot, and the utilization of straw is affected by this. extensive attention. Biochar has a large specific surface area, abundant surface energy groups (such as hydroxyl and carboxyl groups) and a large number of pore structures. Therefore, many studies have focused on the adsorption of heavy metals by biochar. Nitrogen can adjust the electronic properties of biochar to improve the mobility of electrons on it. [0003] Bismuth Tungstate (Bi 2 WO 6 ) Because of its typical perovskite structure and certain ability to ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08A62D3/17A62D101/43A62D101/26A62D101/28A62D101/22
CPCB01J27/24B01J37/082A62D3/17A62D2101/43A62D2101/26A62D2101/28A62D2101/22B01J35/39
Inventor 管运涛毛伟张立勋刘阳
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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