A kind of magnetic sulfur-iron-carbon composite porous environmental protection material and its green preparation method and application

An environmentally friendly material and carbon composite technology, applied in chemical instruments and methods, other chemical processes, alkali metal compounds, etc., can solve the problems of expensive preparation process of water purification materials, limited practical application, time-consuming environment, etc., to achieve good magnetic properties, The effect of low cost and low energy consumption

Active Publication Date: 2022-02-01
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they have some key disadvantages: (a) Separate biochar preparation and iron-sulfur loading process, i.e. first through slow pyrolysis, flash pyrolysis, vacuum pyrolysis, intermediate pyrolysis or hydropyrolysis, etc. High-temperature pyrolysis method is used to prepare carrier biochar materials, and then carry out related loading work; (b) the obtained pyrolyzed biochar materials need to be washed with inorganic acids such as hydrochloric acid to remove ash and activators, so as to endow biochar with a large number of oxygen-containing functional groups and improve Hydrophilic to facilitate iron ion impregnation and iron nanoparticle formation during subsequent loading
This makes the preparation process of water-purifying materials expensive, complicated, time-consuming, and environmentally unfriendly, thereby limiting their practical applications.

Method used

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  • A kind of magnetic sulfur-iron-carbon composite porous environmental protection material and its green preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of magnetic sulfur-iron-carbon composite porous environmental protection material:

[0033] 1) The green tide algae Enteromorpha salvaged from the beach is ground and homogenized and directly put into the hydrothermal reaction kettle, and at the same time, 0.5% by mass of pyrite powder and 0.01% by mass of dimethyl sulfoxide and cysteine ​​are added The acid is mixed to make a deoxidized sulfur-rich slurry, wherein the final concentration of cysteine ​​in the reaction system is 0.1mol / L;

[0034] 2) Add ferrous sulfate solid, sodium dithionite solid, surface dispersant and bischofite solid to the reaction kettle equipped with deoxygenated sulfur-rich slurry, mix well, and perform a rapid hydrothermal reaction at 170°C in a nitrogen atmosphere for 24 Hour. Among them, the mass ratio of iron and deoxidized sulfur-enriched slurry in the mixed system is controlled at 1:30, the molar ratio of iron to sulfur is controlled at 4:1, and the mass ratio of bischofite ...

Embodiment 2

[0040] Preparation of magnetic sulfur-iron-carbon composite porous environmental protection material:

[0041] 1) Collect cow dung from a farm and put it directly into the hydrothermal reaction kettle, add pyrite powder with a mass ratio of 2%, and mix with dimethyl sulfoxide and cysteine ​​with a mass ratio of 0.04% Make a deoxidized sulfur-rich slurry, wherein the final concentration of cysteine ​​in the reaction system is 0.3mol / L;

[0042] 2) Add ferric chloride solid, ferrous ammonium sulfate solid, surface dispersant and titanium tetrachloride to the reaction kettle equipped with deoxygenated sulfur-rich slurry, mix well, use tartaric acid to spray the slurry and the reaction vessel, and seal the reaction device, rapid hydrothermal reaction at 220°C for 1 hour. Control the mass ratio of iron and deoxidized sulfur-enriched slurry in the mixed system to 1:5, the molar ratio of iron to sulfur to 6:1, and the mass ratio of titanium tetrachloride to deoxidized sulfur-enriche...

Embodiment 3

[0047] Preparation of magnetic sulfur-iron-carbon composite porous environmental protection material:

[0048] 1) The activated sludge obtained from a sewage treatment plant is directly put into the hydrothermal reaction kettle, and at the same time, 5% pyrite powder and 0.1% dimethyl sulfoxide and cysteine ​​are added Acid mixing is made into deoxidized sulfur-rich slurry, wherein the final concentration of cysteine ​​in the reaction system is 0.2mol / L;

[0049] 2) Add ferric sulfate solid, sodium sulfide solid, surface dispersant and magnesium chloride to the reaction kettle equipped with deoxygenated sulfur-rich slurry, mix well, use ascorbic acid to spray the slurry and the reaction vessel, seal the reactor, and quickly Hydrothermal reaction for 8 hours. Control the mass ratio of iron and deoxygenated sulfur-enriched slurry in the mixed system at 1:20, the molar ratio of iron-sulfur at 1:1, the mass ratio of magnesium chloride and deoxygenated sulfur-enriched slurry at 1:...

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Abstract

The invention relates to a method in the technical field of environmental protection, in particular to a magnetic sulfur-iron-carbon composite porous environmental protection material and its green preparation method and application. After the biomass is homogenized, the magnetic sulfur-iron-carbon composite porous environmental protection material is obtained through a low-temperature hydrothermal one-step reduction reaction under the action of an iron source and a sulfur source. The prepared magnetic sulfur-iron-carbon composite porous environmental protection material can be applied in water pollution control, soil (sediment) improvement or contaminated environment remediation.

Description

technical field [0001] The invention relates to a method in the technical field of environmental protection, in particular to a magnetic sulfur-iron-carbon composite porous environmental protection material and its green preparation method and application. Background technique [0002] Nano zero-valent iron is a reducing agent with huge specific surface area and high reactivity. The standard oxidation electrode potential of zero-valent iron is low (E=-0.44V), which can reduce most pollutants. The reaction forms an iron oxide coating, which makes it passivate quickly, and it is difficult to separate it from the solution after use, so it has certain limitations in the actual wastewater treatment application. Studies have tried to promote the efficient transfer of electrons from zero-valent iron to iron by doping sulfur or noble metals (such as Pd, Pt, or Ag) or coating zero-valent iron with polymers to improve its colloidal stability and increase its surface area available for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B09C1/00C02F1/28C02F101/20C02F101/30
CPCB01J20/0229B01J20/0266B01J20/20B09C1/00B01J20/28009C02F1/281C02F2101/20C02F2101/30
Inventor 吕剑张翠武君
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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