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Biological type sulfurized zero-valent iron material as well as preparation method and application thereof

A zero-valent iron, bio-based technology, applied in biochemical equipment and methods, microorganism-based methods, chemical instruments and methods, etc., can solve the problems of reduced mobility and reactivity, limiting the large-scale application of zero-valent iron technology, etc. , to achieve the effect of lasting repair of heavy metal pollution, good dispersibility and chemical stability, and high interfacial activity

Active Publication Date: 2021-06-29
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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  • Biological type sulfurized zero-valent iron material as well as preparation method and application thereof
  • Biological type sulfurized zero-valent iron material as well as preparation method and application thereof
  • Biological type sulfurized zero-valent iron material as well as preparation method and application thereof

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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 formula of improved Baar's medium is the same as that in Example 1; adjust the pH value to 7.5; add kaolin, control the liquid-solid ratio to be 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 ...

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Abstract

The invention discloses a biological type sulfurized zero-valent iron material and a preparation method and application thereof, belonging to the technical field of heavy metal pollution remediation. According to the invention, a template material is utilized, a biological reduction method and a chemical reduction method are combined, and the sulfurized zero-valent iron material is synthesized under the combined action of sulfate reducing bacteria and a reducing agent. Besides, in a synthesis process, sulfate reducing bacteria and metabolites thereof are loaded on the surface and in pores of the template material, so various active groups are added to the material, and the adsorption effect of the material on metal ions is enhanced. Compared with a material synthesized by a direct chemical method, the sulfurized zero-valent iron material prepared by the method has better electron transfer performance, adsorption performance and dispersion performance. The raw materials adopted by the invention are environment-friendly, a material preparation process is simple, cost is low, adsorption efficiency is high, and heavy metals in the soil and a water body can be restored 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 Applications(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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