Composite material with zero-valent iron immobilized by biochar, preparation method of composite material and application of composite material in removal of tetracycline in water

A composite material, zero-valent iron technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve problems such as hindering the degradation rate of pollutants, reducing the contact area between ZVI and pollutants, and improving electron transfer. ability, the effect of promoting adsorption and contact area, good electrical conductivity

Pending Publication Date: 2022-05-06
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, small particle size ZVI is prone to aggregation, which reduces the contact area between ZVI and pollutants, and also hinders the degradation rate of pollutants in practical applications.

Method used

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  • Composite material with zero-valent iron immobilized by biochar, preparation method of composite material and application of composite material in removal of tetracycline in water
  • Composite material with zero-valent iron immobilized by biochar, preparation method of composite material and application of composite material in removal of tetracycline in water
  • Composite material with zero-valent iron immobilized by biochar, preparation method of composite material and application of composite material in removal of tetracycline in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation steps of BC / ZVI composite materials are as follows: Weigh 1.0g hematite and 4.0g pine wood biomass (mass ratio 1:4) into a beaker, add 50mL deionized water, stir with a magnetic stirrer and then ultrasonicate for 30min to mix evenly. Centrifuge the homogeneous suspension and collect it in an oven at 60°C for drying, then take it out, pyrolyze the mixture in a tube furnace at 700°C for 1 hour, and inject 350mL min -1 Nitrogen is the protective carrier gas. The taken out BC / ZVI composites were washed three times with ethanol and deionized water respectively, and dried overnight in a vacuum oven at 60 °C.

[0030] Add the prepared biochar-fixed zero-valent iron composite material into water containing tetracycline, and shake at a constant speed of 140rpm for more than 720min;

[0031] Further, EDTA at a concentration of 0.8 mM was added to the tetracycline-containing water.

[0032] Further, add 18 mg L to the water containing tetracycline -1 Ca 2+ . ...

Embodiment 2

[0034] The preparation steps of BC / ZVI composite material are as follows: Weigh 1.0g hematite and 6.0g pine wood biomass (mass ratio 1:6) into a beaker, add 50mL deionized water, stir with a magnetic stirrer and ultrasonicate for 30min to mix evenly. The homogeneous suspension was centrifuged and collected in an oven at 60°C, dried and taken out. The mixture was pyrolyzed in a tube furnace at 900°C for 1 hour, and 450 mL min was passed through the whole process. -1 Nitrogen is the protective carrier gas. The taken out BC / ZVI composites were washed three times with ethanol and deionized water respectively, and dried overnight in a vacuum oven at 60 °C.

[0035] Add the prepared biochar-fixed zero-valent iron composite material into water containing tetracycline, and shake at a constant speed of 160rpm for more than 720min;

[0036] Further, EDTA at a concentration of 1.2 mM was added to the tetracycline-containing water.

[0037] Further, add 22mg L to the water containing t...

Embodiment 3

[0039] Preparation of BC / ZVI composites

[0040] The specific steps of material preparation are: weigh 1.0g hematite and 5.0g pine wood biomass (pine wood biomass is collected from a local furniture processing factory, after using a particle crusher to pulverize) (mass ratio is 1:5) into a beaker, Add 50 mL of deionized water, stir with a magnetic stirrer and then sonicate for 30 min to mix evenly. The homogeneous suspension was centrifuged and collected in an oven at 60°C, dried and taken out. The mixture was pyrolyzed in a tube furnace at 800°C for 1 hour, and 400 mL min was passed through the whole process. -1 Nitrogen is the protective carrier gas. The taken out BC / ZVI composites were washed three times with ethanol and deionized water respectively, and dried overnight in a vacuum oven at 60 °C. At the same time, pure biochar was prepared by pyrolyzing pine biomass separately under the same conditions as a control treatment (BC); ferric chloride was reduced by sodium bor...

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Abstract

The invention relates to the technical field of wastewater treatment, in particular to a composite material with zero-valent iron immobilized by biochar and application of the composite material in removal of tetracycline in water, hematite and biomass are added into deionized water, and ultrasonic treatment is performed after sufficient stirring; after drying, pyrolyzing in a tubular furnace at 700-900 DEG C, and introducing nitrogen as a protective carrier gas in the whole process; and respectively washing the pyrolyzed material with ethanol and deionized water, drying in a vacuum oven to obtain a BC/ZVI composite material, adding the BC/ZVI composite material into water containing tetracycline, and stirring at a constant speed. The method disclosed by the invention is relatively high in pollutant removal efficiency and relatively large in adsorption capacity.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a composite material for fixing zero-valent iron by biochar, a preparation method thereof and an application in removing tetracycline from water. Background technique [0002] In recent years, the excessive use and non-standard treatment of antibiotics have caused their excessive accumulation in water bodies and soils, seriously endangering human health. Tetracycline (TC), as a widely used antibiotic, is excessively used and treated improperly, resulting in its excessive accumulation in water bodies, which seriously endangers human health. Due to its low cost and good antibacterial properties, its demand is constantly increasing, and the greater demand is also accompanied by greater environmental risks. Due to the application of TC in the breeding industry, the tetracycline content in pig excrement can be as high as 9.09mg / g, and some studies have shown that there a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/38C02F101/34
CPCB01J20/20B01J20/02C02F1/283C02F2101/38C02F2101/34
Inventor 施俊王小治王圣森
Owner YANGZHOU UNIV
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