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A kind of biological type zero-valent iron sulfide material and its preparation method and application

A zero-valent iron and bio-based technology, applied in biochemical equipment and methods, microbial-based methods, chemical instruments and methods, etc., can solve the problems of reduced mobility and reactivity, and limitations on the large-scale application of zero-valent iron technology , to achieve long-lasting repair of heavy metal pollution, good dispersion and chemical stability, and high interface activity

Active Publication Date: 2022-02-18
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ZVI is prone to agglomeration and passivation, resulting in reduced mobility and reactivity, which limits the large-scale application of ZVI technology.

Method used

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  • A kind of biological type zero-valent iron sulfide material and its preparation method and application
  • A kind of biological type zero-valent iron sulfide material and its preparation method and application
  • A kind of biological type zero-valent iron sulfide material and its preparation method and application

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preparation example Construction

[0024] The invention provides a preparation method of biological type zero-valent iron sulfide material, comprising the following steps:

[0025] adding the template material into the culture medium for sulfate-reducing bacteria, and performing anaerobic sterilization to obtain a sterilized culture solution;

[0026] After mixing the sterilized culture solution and ferrous salt, inoculate sulfate-reducing bacteria, and perform microbial reduction in an anaerobic environment to obtain microbial reduction;

[0027] Under an inert gas atmosphere, the microbial reduction product is mixed with a reducing agent to carry out a chemical reduction reaction to obtain the biological zero-valent iron sulfide material.

[0028] In the invention, the template material is added into the culture medium of sulfate-reducing bacteria, anaerobically sterilized, and the sterilized culture solution is obtained.

[0029] In the present invention, the template material preferably includes one or mor...

Embodiment 1

[0063] figure 1 It is a schematic diagram of the process flow for preparing bio-type zero-valent iron sulfide material in Example 1 of the present invention.

[0064] A biological type zero-valent iron sulfide material, the specific preparation method is as follows:

[0065] (1) Prepare improved Baar's medium, the formula is as follows: KH 2 PO 4 0.5 g / L, NH 4 Cl 1g / L, CaSO 4 2H 2 O1g / L, MgSO 4 2 g / L, sodium citrate 5g / L, sodium lactate 3.5g / L, yeast extract 1g / L; adjust the pH value to 7.5; add kaolin to control the liquid-solid ratio to 100:1; fill the above solution to anaerobic In the bottle, sterilize at 121°C for 15 minutes; after the anaerobic bottle is cooled, add Fe(NH 4 ) 2 ·(SO 4 ) 2 ·6H 2 O to 2g / L, and inoculate sulfate-reducing bacteria in an anaerobic incubator with an initial bacterial concentration of 5×10 7 CFU / mL; seal to ensure an anaerobic environment in the anaerobic bottle, and place it in a constant temperature shaker for cultivation at 30°C...

Embodiment 2

[0070] A biological type zero-valent iron sulfide material, the specific preparation method is as follows:

[0071] (1) Prepare improved Baar's medium, the formulation of improved Baar's medium is the same as in Example 1; adjust the pH value to 7.5; add kaolin to control the liquid-solid ratio to 100:0.5; put the above solution in an anaerobic bottle at 121°C sterilized for 15 minutes; after the anaerobic bottle cools down, add Fe(NH 4 ) 2 ·(SO 4 ) 2 ·6H 2 O to 3g / L, and inoculate sulfate-reducing bacteria in an anaerobic incubator with an initial bacterial concentration of 1×10 7 CFU / mL; seal to ensure an anaerobic environment in the anaerobic bottle, and place it in a constant temperature shaker for cultivation at 30°C;

[0072] (2) Potassium borohydride solution is prepared, and the molar concentration of potassium borohydride is 1mol / L;

[0073](3) After the microorganisms in step (1) are cultivated for 72h, under the protection of nitrogen atmosphere, slowly add th...

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Abstract

A biological sulfide zero-valent iron material and its preparation method and application belong to the technical field of heavy metal pollution remediation. The invention utilizes the template material, combines the biological reduction method and the chemical reduction method, and synthesizes the sulfurized zero-valent iron material under the joint action of the sulfate-reducing bacteria and the reducing agent. In addition, during the synthesis process, sulfate-reducing bacteria and their metabolites are loaded on the surface and pores of the template material, thereby adding a variety of active groups to the material and enhancing the adsorption effect of the material on metal ions. Compared with the material synthesized by the direct chemical method, the sulfide zero-valent iron material prepared by the method has better electron transfer performance, adsorption performance and dispersion performance. The raw materials adopted in the invention are all environment-friendly, the material preparation process is simple, the cost is low, the adsorption efficiency is high, and heavy metals in soil and water can be repaired at the same time.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal pollution, and in particular relates to a biological type zero-valent iron sulfide material and a preparation method thereof and its application in heavy metal polluted soil and water bodies. Background technique [0002] With the acceleration of industrialization and urbanization, chromium (Cr), arsenic (As), cadmium (Cd), copper (Cu), mercury (Hg), lead (Pb), selenium (Se), zinc (Zn ), nickel (Ni) and other heavy metal pollution is becoming more and more serious. Heavy metals have become a major threat to human and environmental health due to their non-biodegradability, high toxicity, persistence, and possible continuous accumulation in organisms through the food chain. Heavy metals can strongly interact with proteins and various enzymes in the human body, making them inactive, leading to various human diseases, including cardiovascular disease, cancer, chronic anemia and dam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/00C12P3/00C02F3/34C12R1/01C02F101/20
CPCB09C1/08B09C1/002C12P3/00C02F3/34C02F2101/20B09C2101/00
Inventor 李骞许瑞陈许玲南小龙姜涛杨永斌金胜明尹华群蒋国清姜必广徐斌王丽敏尹哲董斯宇韩雨琪
Owner CENT SOUTH UNIV
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