Preparation method and application of biochar-loaded nano zero-valent iron sulfide material

A zero-valent iron and biochar technology, applied in chemical instruments and methods, physical/chemical process catalysts, water pollutants, etc., can solve the problems of reduced reaction rate, reduced flow performance, and reduced specific surface area

Active Publication Date: 2020-04-10
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, nZVI also faces limitations in in-situ repair and storage brought about by its own properties in practical applications: (1) Nano-sized zero-valent iron is prone to side reactions with water and air due to its small particle size and high activity. Rapidly loses its reactivity, resulting in a short lifetime of nano-ZVI
(2) Nano zero-valent iron is prone to agglomeration due to its own magnetism, which reduces its specific surface area, reduces its reaction rate, and reduces its fluidity in water, making it difficult for nZVI to diffuse unevenly and completely contact with pollutants. thereby reducing utilization
This method is not only complicated, but also expensive chemical reagents such as sodium borohydride limit the large-scale application of materials

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  • Preparation method and application of biochar-loaded nano zero-valent iron sulfide material
  • Preparation method and application of biochar-loaded nano zero-valent iron sulfide material
  • Preparation method and application of biochar-loaded nano zero-valent iron sulfide material

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[0028] The invention provides a preparation method of biochar-loaded nanometer zero-valent iron sulfide material, comprising the following steps:

[0029] Under vacuum or inert atmosphere, the biomass and FeSO 4 The solutions were mixed, evaporated to dryness, ground, and dried to obtain the loaded FeSO 4 biomass;

[0030] The loaded FeSO 4 The biomass is pyrolyzed at 800-1000°C under an inert atmosphere to obtain biochar-supported nano-zero-valent iron sulfide materials.

[0031] Compared with the prior art, the present invention adopts the one-pot pyrolysis method to prepare the biochar-loaded nano-sulfurized zero-valent iron material, without adding additional chemical reduction reagents and vulcanization reagents, and achieves simultaneous biochar reduction of zero-valent iron. The purpose of loading and vulcanization modification is simple, and the prepared material can quickly and effectively treat sewage containing halogenated organic matter.

[0032] In the present...

Embodiment 1

[0044] 1.1 Raw material pretreatment: pulverize the sawdust, sieve, keep the 100-200 mesh sieved sawdust, and dry it at 80°C for later use.

[0045] 1.2 Add 5mmol FeSO 4 ·7H 2 O. 5g of sawdust treated in 1.1 and 200ml of deoxygenated water were mixed and dispersed under the assistance of ultrasound, then the mixed solution was transferred to a flask, deoxygenated with nitrogen for 30min, shaken at 180r / m in a water bath shaker at 25°C for 12h, and then used The moisture in the flask was evaporated to dryness by a rotary evaporator, and the solid composite was dried in a vacuum drying oven at 80° C., and after uniform grinding, the biomass loaded with ferrous sulfate was obtained.

[0046] 1.3 Under a nitrogen atmosphere, use a rapid pyrolysis furnace to rapidly pyrolyze 2 g of the above-mentioned sawdust loaded with ferrous sulfate at 800 ° C for 1 hour to obtain biochar-supported nano-zero-valent iron sulfide (SBC-800) .

[0047] figure 1 It is the TEM figure of the bioch...

Embodiment 2

[0050] 1.1 Raw material pretreatment: pulverize the sawdust, sieve, keep the 100-200 mesh sieved sawdust, and dry it at 80°C for later use.

[0051] 1.2 Add 5mmol FeSO 4 ·7H 2 O. 5g of sawdust treated in 1.1 and 200ml of deoxygenated water were mixed and dispersed under the assistance of ultrasound, then the mixed solution was transferred to a flask, deoxygenated with nitrogen for 30min, shaken at 180r / m in a water bath shaker at 25°C for 12h, and then used The moisture in the flask was evaporated to dryness by a rotary evaporator, and the solid composite was dried in a vacuum drying oven at 80° C., and after uniform grinding, the biomass loaded with ferrous sulfate was obtained.

[0052] 1.3 Under a nitrogen atmosphere, use a rapid pyrolysis furnace to rapidly pyrolyze 2 g of the above-mentioned sawdust loaded with ferrous sulfate at 900 ° C for 1 hour to obtain biochar-supported nano-zero-valent iron sulfide (SBC-900) .

[0053] Biochar-loaded nano-zero-valent iron sulfid...

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Abstract

The invention provides a biochar-loaded nanometer sulfurized zero-valent iron material and a preparation method and application thereof. The method comprises the following steps: mixing biomass and aFeSO4 solution in a vacuum or inert atmosphere, evaporating to dryness, grinding and drying to obtain FeSO4-loaded biomass; and pyrolyzing the FeSO4-loaded biomass at 800-1000 DEG C in an inert atmosphere to obtain the biochar-loaded nano zero-valent iron sulfide material. The material is prepared by adopting a one-pot pyrolysis method, the method is simple, and the biochar-loaded nano zero-valentiron sulfide material can improve the dispersity and stability of nano zero-valent iron sulfide, so that the reaction activity of the nano zero-valent iron sulfide on halogenated organic matters is improved, and sewage containing the halogenated organic matters is rapidly and effectively treated. Vulcanization modification not only enhances the reaction activity of the material, but also improvesthe aging resistance of the material in water, and inhibits the passivation of the material, thereby prolonging the service life of the zero-valent iron and improving the degradability of zero-valentiron.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-sulfide zero-valent iron, in particular to a preparation method and application of a biochar-loaded nano-sulfide zero-valent iron material. Background technique [0002] Diclofenac (DCF) is a synthetic non-steroidal anti-inflammatory drug that is widely used as an analgesic. Due to its poor degradation effect in conventional sewage treatment plants, DCFs have been found in various environments including drinking water, surface water, and groundwater. Diclofenac interferes with biochemical functions in fish and causes tissue damage, so diclofenac concentrations are considered "emerging pollutants" even at ng / L levels. [0003] Nano zero-valent iron (nZVI) is used as an efficient improvement material for in-situ remediation of water pollution due to its superior adsorption performance, reduction activity, reaction rate and good environmental compatibility. It is used in the fields of se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/70B01J27/043C02F101/36
CPCB01J27/043C02F1/281C02F1/283C02F1/70C02F2101/36
Inventor 江鸿徐步德
Owner UNIV OF SCI & TECH OF CHINA
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