Preparation method and application of sulfhydrylation biochar for repairing heavy metal polluted water and soil

A sulfhydryl compound and biochar technology is applied in the restoration, application, soil conditioning materials and other directions of polluted soil, which can solve the problems of unfavorable scale application, complicated preparation process, high pharmaceutical price, etc., and achieves short treatment time and low preparation cost. , stable passivation effect

Active Publication Date: 2019-10-25
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

"CN 109135759 A" discloses a heavy metal remediation agent for soil, including modified porous ferric oxide, modified activated carbon and modified montmorillonite, which improves its complexation of heavy metals by grafting various functional groups including mercapto Combining and immobilizing properties, the repair agent can reduce the content of mobile cobalt and lead in the soil, but its preparation process is complicated, and some preparation steps need to be carried out under high temperature and high pressure conditions
"CN 109046260 A" invented a thiol-functionalized attapulgite and its application in cadmium-polluted water bodies. Although the adsorption capacity of attapulgite to heavy metals is greatly improved after mercapto-functionalization, it uses 3-mercaptopropyltrimethyl Oxysilane is used as a mercapto group donor, and the price of this agent is relatively expensive, which is not conducive to large-scale application

Method used

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  • Preparation method and application of sulfhydrylation biochar for repairing heavy metal polluted water and soil
  • Preparation method and application of sulfhydrylation biochar for repairing heavy metal polluted water and soil
  • Preparation method and application of sulfhydrylation biochar for repairing heavy metal polluted water and soil

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Embodiment 1

[0032] Embodiment 1, the preparation of thiolated biochar

[0033] The preparation method of a kind of thiolated biochar provided by the embodiment of the present invention comprises:

[0034] (1) Preparation of biochar: Dry and crush rice straw, heat up to 500°C at a rate of 20°C / min under anaerobic or anaerobic conditions, thermally crack until complete carbonization, cool naturally, and grind through a 60-mesh sieve , take the first sieve to obtain biochar.

[0035] (2) Mix 1 g of biochar prepared in step (1) with 4 mL of β-mercaptoethanol, add 2.8 mL of acetic anhydride and 0.2 mL of concentrated sulfuric acid, mix in a constant temperature water bath at 80°C for 18 hours, and cool to room temperature The mixture was washed with water and suction filtered, dried at 35°C for 18 hours, ground through a 60-mesh sieve, and the first sieve was taken to obtain thiolated biochar.

[0036] The esterification reaction of the above-mentioned thiol-treated biochar during the thiol ...

Embodiment 2

[0039] Example 2 Adsorption effect of thiolated biochar on single cadmium, lead, copper and zinc

[0040] At pH=5, the concentration is 0.05 mol•L -1 The acetic acid-sodium acetate buffer solution was used as a solvent to prepare cadmium ions, lead ions, copper ions and zinc ions at a concentration of 500 mg·L -1 single heavy metal contaminated solution. Accurately weigh a certain amount of thiolated biochar prepared in Example 1 and place it in a 15 mL centrifuge tube, add a certain volume of cadmium, lead, copper and zinc single heavy metal contamination solution at a solid-to-liquid ratio of 1:400, and centrifuge Tube placed at 25°C, 180 r·min -1 Under the condition of shaking for 24h.

[0041] Such as image 3The results showed that the adsorption capacity of thiolated biochar on cadmium ions, lead ions, copper ions and zinc ions in a single heavy metal-contaminated solution was 47.62 mg·g -1 , 56.67 mg·g -1 , 34.23 mg·g -1 and 22.14 mg g -1 . This indicated that ...

Embodiment 3

[0042] Example 3 Adsorption effect of thiolated biochar on complex pollution of cadmium, lead, copper and zinc

[0043] At pH=5, the concentration is 0.05 mol•L -1 The acetic acid-sodium acetate buffer solution was used as a solvent to prepare cadmium ions, lead ions, copper ions and zinc ions at a concentration of 500 mg L -1 Heavy metal compound polluted solution. Accurately weigh a certain amount of thiolated biochar prepared in Example 1 and place it in a 15 mL centrifuge tube, add a certain volume of heavy metal pollution solution of cadmium, lead, copper and zinc at a solid-to-liquid ratio of 1:400, and place the centrifuge tube Placed at 25°C, 180 r·min -1 Under the condition of shaking for 24h.

[0044] Such as Figure 4 As shown, the final adsorption capacity of thiolated biochar on cadmium ions, lead ions, copper ions and zinc ions in the heavy metal complex pollution solution was 13.98 mg g -1 , 14.20 mg·g -1 , 30.35 mg·g -1 and 7.59 mg·g -1 . This indicate...

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Abstract

The invention discloses a preparation method and application of sulfhydrylation biochar for repairing heavy metal polluted water and soil. The preparation method comprises the steps that biochar is prepared by biomass pyrolysis and carbonization, the biochar is mixed with beta-mercaptoethanol, acetic anhydride and concentrated sulfuric acid, the mixture reacts at 70-90 DEG C for 17-24 hours, and is cooled to the room temperature, and washing, suction filtration, drying and grinding are conducted to obtain the sulfhydrylation biochar. According to the preparation method of the sulfhydrylation biochar, the process is easy, required equipment is simple, and the preparation cost is low. The sulfhydrylation biochar can absorb heavy metal ions such as cadmium, lead, copper and zinc existing singly or compositely in a solution, further can passivate heavy metals such as the cadmium, the lead, the copper and the zinc in the soil compositely polluted by the heavy metals, the effectiveness of the heavy metals is lowered, the physical and chemical properties of the soil are improved, and wide application prospects are achieved.

Description

technical field [0001] The invention relates to the technical field of heavy metal remediation, in particular to the preparation and application of a mercaptolated biochar for remediating heavy metal polluted water and soil. Background technique [0002] With the rapid development of industrialization and urbanization, human activities such as mining and metal smelting and processing have caused a large amount of heavy metals to enter the soil. The "National Soil Pollution Survey Bulletin" published in 2014 showed that the total soil exceeding the standard rate was 16.1%. Among them, the excess rates of typical heavy metals cadmium, lead, copper and zinc were 7%, 1.5%, 2.1% and 0.9%, respectively. Heavy metals in the soil can be absorbed by crops and transmitted through the food chain to cause long-term harm to human health. In the face of severe soil heavy metal pollution, it is necessary to continue to develop effective soil heavy metal pollution remediation technologies ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00C09K17/40C09K101/00
CPCB09C1/08B09C1/002C09K17/40B09C2101/00C09K2101/00
Inventor 蔡超范家俊张又弛池海峰侯艳伟
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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