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Preparation method and application of nanometer zero-valence bimetal-supported functional charcoal

A nano-zero-valent, biochar technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., to achieve the effect of simple preparation method, uniform distribution, and improved porosity

Inactive Publication Date: 2016-08-17
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the modified biochar-supported nano-bimetallic system

Method used

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  • Preparation method and application of nanometer zero-valence bimetal-supported functional charcoal
  • Preparation method and application of nanometer zero-valence bimetal-supported functional charcoal
  • Preparation method and application of nanometer zero-valence bimetal-supported functional charcoal

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preparation example Construction

[0026] In this preparation method, the biochar modified by sodium hydroxide is used as the carrier, and the nanometer zero-valent metal iron and silver are used as the active components. The active components are loaded on the carrier by impregnation and liquid phase reduction. The amount is 0.1-15wt% of the weight of the functional biochar, and it is prepared to load nano-sized zero-valent bimetallic functional biochar; including the following steps:

[0027] 1) After washing and drying the biochar, immerse it in 1~8mol·L -1 Sodium hydroxide solution, with a solid-to-liquid ratio of 1:1 to 1:10, continuously stirred for 6 to 12 hours at a temperature of 50°C to 80°C to obtain modified biochar, washed with a large amount of primary water until nearly neutral, filtered, Dry and store at 85°C for later use;

[0028] 2), weigh 2g of ferrous sulfate and polyethylene glycol and dissolve in ethanol aqueous solution, the mass ratio of described ferrous sulfate and polyethylene glyco...

Embodiment 1

[0035] Embodiment 1: A kind of preparation method of loaded nanometer zero-valent bimetal functional biochar, comprises the following steps:

[0036] 1) After cleaning and drying the original biochar, immerse it in 1mol·L -1 Sodium hydroxide solution, with a solid-to-liquid ratio of 1:10, continued stirring for 6 hours at a temperature of 50°C to obtain modified biochar, filtered and washed with a large amount of primary water until it was nearly neutral, dried at 85°C and stored for later use.

[0037] 2) Weigh 2g of ferrous sulfate and polyethylene glycol (mass ratio: 40:1) and dissolve in aqueous ethanol (volume ratio: 1:1). The weighed and dried modified biochar was submerged in the mixed system of ferrous sulfate and polyethylene glycol, and ultrasonicated for 1 hour with a power of 200W.

[0038] 3) Prepare 60mL0.4mol L -1 Sodium borohydride solution was titrated into the biochar-ferrous sulfate-polyethylene glycol mixed system at a rate of 3mL per minute, the reaction...

Embodiment 2

[0041] Embodiment 2: a kind of preparation method of loaded nanometer zero-valent bimetal functional biochar, comprises the following steps:

[0042] 1) After cleaning and drying the original biochar, immerse it in 4mol·L -1 Sodium hydroxide solution with a solid-to-liquid ratio of 1:5, continuously stirred for 8 hours at 60°C to obtain modified biochar, filtered and washed with a large amount of primary water until nearly neutral, dried at 85°C and stored for later use.

[0043] 2) Weigh 2g of ferrous sulfate and polyethylene glycol (mass ratio: 100:1) and dissolve in aqueous ethanol (volume ratio: 2:1). The weighed and dried modified biochar was immersed in the mixed system of ferrous sulfate and polyethylene glycol, and ultrasonicated for 2 hours with a power of 350W.

[0044] 3) Prepare 60mL0.8mol L -1 Sodium borohydride solution was titrated into the biochar-ferrous sulfate-polyethylene glycol mixed system at a rate of 2mL per minute, the reaction temperature was 10°C, ...

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Abstract

The invention relates to a preparation method and an application of nanometer zero-valence bimetal-supported functional charcoal, and belongs to a preparation method and an application of charcoal for water pollution treatment. The preparation method comprises the following steps: immersing charcoal in a sodium hydroxide solution to modify the charcoal, immersing the modified charcoal in a ferrous sulfate and polyethylene glycol mixed solution, carrying out ultrasonic treatment to make an active component Fe be supported on the modified charcoal carrier, and titrating with sodium borohydride to prepare a zero-valence nanometer iron charcoal-based material; and filtering the nanometer zero-valence iron charcoal-based material, washing the filtered nanometer zero-valence iron charcoal-based material, gradually adding a silver nitrate solution to the above obtained zero-valence iron-supported charcoal solution, and strong stirring to obtain a nanometer zero-valence Ag / Fe bimetal charcoal-based adsorbent. The functional charcoal is prepared from abundant agricultural wastes, the specific surface area and the porosity of the charcoal are greatly improved through regulating the structure of the charcoal by using an in situ supporting and liquid phase reduction technologies, and the charcoal can be widely applied to the sewage treatment field.

Description

technical field [0001] The invention relates to a preparation method and application of biochar for water pollution treatment, in particular to a preparation method and application of nanometer zero-valent bimetallic functional biochar. Background technique [0002] At present, the exploitation of groundwater in our country accounts for about 20% of the total water supply. Many northern cities and vast rural areas are mainly supplied with groundwater. However, with the development of industry and agriculture, the quality of groundwater continues to deteriorate. Carbon tetrachloride is an important organic solvent and product intermediate, and the surrounding groundwater is seriously polluted due to leakage and discharge during use. Because of its carcinogenic effect, carbon tetrachloride has been included in the list of 129 priority pollutants in the United States and the list of 58 priority environmental monitoring and control organic substances in China. The common treatm...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28
CPCB01J20/20B01J20/02B01J2220/4806B01J2220/4812C02F1/281C02F1/283C02F1/288C02F2101/36
Inventor 吴鸿伟冯启言朱雪强李向东孟庆俊高波苗亦新徐潇李海红
Owner CHINA UNIV OF MINING & TECH
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