阅读说明：本技术 一种钨酸铋氮硫共同改性生物炭的制备方法 (Preparation method of bismuth tungstate nitrogen sulfur co-modified biochar ) 是由 管运涛 毛伟 张立勋 刘阳 于 2020-04-29 设计创作，主要内容包括：一种钨酸铋氮硫共同改性生物炭的制备方法,包括如下步骤：S1、将生物炭原料用硫脲进行浸润改性,将改性之后的材料放置在氮气中反应,得到氮硫掺杂改性生物炭；S2、以乙二醇为溶剂,制备油酸钠和五水合硝酸铋的混合溶液；S3、将二水合钨酸钠加入油酸钠硝酸铋混合溶液中；S4、将步骤S1得到的氮硫掺杂改性生物炭加入步骤S3得到的混合溶液中；S5、使步骤S4得到的混合溶液进行反应；S6、获取步骤S5反应后得到的反应物固体；S7、将所述反应物固体干燥后得到钨酸铋氮硫共同改性生物炭。本发明氮硫共同改性后的钨酸铋氮硫共同改性生物炭能促进对有机物和重金属的吸附,提高光催化性能。(A preparation method of bismuth tungstate nitrogen sulfur co-modified biochar comprises the following steps: s1, soaking and modifying the biochar raw material by using thiourea, and placing the modified material in nitrogen for reaction to obtain nitrogen-sulfur doped modified biochar; s2, preparing a mixed solution of sodium oleate and pentahydrate bismuth nitrate by using ethylene glycol as a solvent; s3, adding sodium tungstate dihydrate into the sodium oleate bismuth nitrate mixed solution; s4, adding the nitrogen and sulfur doped modified biochar obtained in the step S1 into the mixed solution obtained in the step S3; s5, reacting the mixed solution obtained in the step S4; 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 sulfur co-modified biochar. The bismuth tungstate nitrogen sulfur co-modified charcoal subjected to nitrogen sulfur co-modification can promote adsorption of organic matters and heavy metals and improve photocatalytic performance.)

1. A preparation method of bismuth tungstate nitrogen sulfur co-modified biochar is characterized by comprising the following steps:

s1, soaking and modifying the biochar raw material by using thiourea, and placing the modified material in nitrogen for reaction to obtain nitrogen-sulfur co-modified biochar NSBC;

s2, preparing a mixed solution of sodium oleate and pentahydrate bismuth nitrate by using ethylene glycol as a solvent;

s3, adding sodium tungstate dihydrate into the sodium oleate bismuth nitrate mixed solution;

s4, adding the nitrogen and sulfur co-modified biochar NSBC obtained in the step S1 into the mixed solution obtained in the step S3;

s5, reacting the mixed solution obtained in the step S4;

s6, obtaining a reactant solid obtained after the reaction in the step S5;

s7, drying the reactant solid to obtain bismuth tungstate nitrogen sulfur co-modified biochar Bi₂WO₆/NSBC。

2. The method for preparing bismuth tungstate, nitrogen sulfide co-modified biochar as claimed in claim 1, wherein the biochar raw material is corn stalks.

3. The method for preparing bismuth tungstate nitrogen sulfur co-modified biochar as claimed in claim 1 or 2, wherein in step S1, the biochar raw material is crushed, soaked in dilute nitric acid to remove surface organic matters, improve the affinity of the biochar raw material surface to nitrogen sulfur elements, dried, soaked and modified with thiourea, dried, and the modified material is reacted in a vacuum muffle furnace with nitrogen gas at 600 ℃ for 3h, and then cooled to obtain nitrogen sulfur co-modified biochar NSBC.

4. The method for preparing bismuth tungstate nitrogen sulfur co-modified biochar as claimed in any one of claims 1 to 3, wherein in step S2, sodium oleate is dissolved in ethylene glycol, and bismuth nitrate pentahydrate is added when the sodium oleate is completely dissolved.

5. The method for preparing bismuth tungstate nitrogen sulfur co-modified biochar as claimed in any one of claims 1 to 4, wherein in step S3, sodium tungstate dihydrate is dissolved in ethylene glycol at 60 ℃, and after complete dissolution, the sodium tungstate dihydrate is added into the mixed solution of sodium oleate and bismuth nitrate and stirred for 30 min.

6. The method for preparing bismuth tungstate nitrogen sulfur co-modified biochar as claimed in any one of claims 1 to 5, wherein in step S4, nitrogen sulfur doped modified biochar NSBC is dissolved in ethylene glycol and subjected to ultrasonic treatment for 20min, then added to the mixed solution obtained in step S3, and stirred for 1.5h before being uniformly mixed.

7. The method for preparing bismuth tungstate nitrogen sulfur co-modified biochar as claimed in any one of claims 1 to 6, wherein in step S5, the mixed solution obtained in step S4 is reacted in a reaction kettle at 200 ℃ for 24 h.

8. The method for preparing bismuth tungstate nitrogen sulfur co-modified biochar as claimed in any one of claims 1 to 7, wherein in step S6, after cooling to room temperature, the reactant solid is taken out and washed with a mixed solution of ethanol and water by suction filtration.

9. The method for preparing bismuth tungstate nitrogen sulfur co-modified biochar as claimed in any one of claims 1 to 8, wherein in step S7, the washed reactant solid is dried at 80 ℃ for 4h to obtain bismuth tungstate nitrogen sulfur co-modified biochar Bi₂WO₆/NSBC。

10. The preparation method of bismuth tungstate nitrogen sulfur co-modified biochar as claimed in any one of claims 1 to 9, wherein in step S1, the weight ratio of thiourea to the biochar raw material is 2: 1-1: 1, such as 3: 2; preferably, in steps S2-S7, the following proportioning relationship is adopted: 0.1-0.05g of 4mmol of sodium oleate, 4mmol of bismuth nitrate pentahydrate, 2mmol of sodium tungstate dihydrate and nitrogen-sulfur doped modified biochar NSBC.