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Vulcanized nano zero-valent iron-acid activated montmorillonite composite material, and preparation method and application thereof

A nano-zero-valent iron and composite material technology is applied in the field of soil pollution remediation, which can solve the problems of poor alkaline polluted soil effect, difficulty in meeting remediation requirements, and high sulfate content, and achieves the promotion of interlayer cation dissolution and effective adsorption sites. The effect of increasing the number of dots and increasing the specific surface area

Active Publication Date: 2020-09-29
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these iron-based remediation agents have a good reduction effect on acidic and neutral soils and low-concentration Cr(Ⅵ) polluted soils, but are often not effective on alkaline polluted soils.
However, in many chromium products industries (such as chromium chemical industry, chromium smelting industry), the production process of Cr-contaminated soil often has a pH between 9 and 11, and the alkalinity is very strong, so it is difficult to repair.
Adding a single repair material is difficult to meet the repair requirements, and usually requires other auxiliary agents to repair
For example, the detoxification of Cr(Ⅵ) slag with strong alkalinity and high concentration, the current mainstream process is to use sulfuric acid plus ferrous sulfate wet detoxification, which requires high concentration of chemicals and large dosage, and the soil moisture content after treatment High, pH drops significantly, and the sulfate content in the soil is high, there is a risk of salinity, which is not conducive to reuse
Therefore, in view of the poor remediation effect of a single remediation agent on alkaline Cr(Ⅵ)-contaminated soil, it is urgent to study new, green and non-polluting materials to achieve efficient remediation of alkaline Cr(Ⅵ)-contaminated soil.

Method used

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  • Vulcanized nano zero-valent iron-acid activated montmorillonite composite material, and preparation method and application thereof
  • Vulcanized nano zero-valent iron-acid activated montmorillonite composite material, and preparation method and application thereof
  • Vulcanized nano zero-valent iron-acid activated montmorillonite composite material, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Embodiment 1: Different FeS / Fe 0 Preparation of Sulfurized Nanoscale Zero-Valent Iron-Acid-Activated Montmorillonite Composite Materials (One-Step Method)

[0046] Take 20g of calcium montmorillonite and disperse it in 100mL volume concentration of 20% sulfuric acid solution, react in a constant temperature oscillating reactor at 60°C for 8h, centrifuge after cooling, wash repeatedly with deionized water until no sulfate ion is detected in the waste liquid, After centrifugation, the solid was dried in a constant temperature drying oven at 105° C. for 12 hours to obtain an acid-activated montmorillonite product. Weigh 2.8g acid-activated montmorillonite in 100ml deoxidized deionized water, stir evenly, add 13.9g FeSO 4 ·7H 2 O, adsorb for 4 hours under nitrogen atmosphere, add 50mL sodium borohydride and 50mL Na 2 S solution. Press BH 4 - / Fe molar ratio of 2, 1.8 and 1 to control the concentration of sodium borohydride dosing is 2, 1.8 and 1mol / L; according to the...

Embodiment 2

[0047] Example 2: FeS / Fe 0 Preparation of 1 / 1 Sulfurized Nano-ZVF-Acid-Activated Montmorillonite Composite (Two-step Method)

[0048] Take 20g of calcium montmorillonite and disperse it in 100mL volume concentration of 20% sulfuric acid solution, react in a constant temperature oscillating reactor at 60°C for 8h, centrifuge after cooling, wash repeatedly with deionized water until no sulfate ion is detected in the waste liquid, After centrifugation, the solid was dried in a constant temperature drying oven at 105° C. for 12 hours to obtain an acid-activated montmorillonite product. Weigh 2.8g acid-activated montmorillonite in 100ml deoxidized deionized water, stir evenly, add 13.9g FeSO 4 ·7H 2 O, adsorbed under nitrogen atmosphere for 4h, at a rate of 0.5 ~ 3mL / min, according to BH 4 - Add 50mL of 1mol / L sodium borohydride solution at a / Fe molar ratio of 1, and then continue to react for 30min; then continue to drop 50mL of 0.5mol / L Na 2 S solution, and then continue to...

Embodiment 3

[0049] Example 3: FeS / Fe 0 Preparation of 1 / 1 sulfide nano-ZVI-montmorillonite composites (two-step method)

[0050] Weigh 2.8g calcium montmorillonite in 100ml deoxidized deionized water, stir evenly, adjust the pH value to 2, add 13.9g FeSO 4 ·7H 2 O, adsorbed under nitrogen atmosphere for 4h, at a rate of 0.5 ~ 3mL / min, according to BH 4 - Add 50mL of 1mol / L sodium borohydride solution at a / Fe molar ratio of 1, and then continue to react for 30min; then continue to drop 50mL of 0.5mol / L Na 2 S solution, and then continue to react for 30 minutes after completion. Centrifuge, rinse with deoxygenated and deionized water repeatedly, and finally dry in a freeze dryer for 24 hours to obtain FeS / Fe synthesized by two-step method 0 Sulfurized nano zero-valent-montmorillonite composite material with a ratio of 1 / 1.

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Abstract

The invention discloses a vulcanized nano zero-valent iron-acid activated montmorillonite composite material, and a preparation method and application thereof. The composite material is composed of spherical particles with nano zero-valent iron as a core and ferrous sulfide as a shell, is of a nano long-chain structure, has uniformly distributed and highly dispersed iron and sulfur elements, and has typical structural characteristics of silicate and zero-valent iron. The vulcanized nano zero-valent iron-acid activated montmorillonite composite material prepared by the invention is simple in raw material components, green, pollution-free and low in cost; and the product is convenient to transport and store. The prepared vulcanized nano zero-valent iron-acid activated montmorillonite composite material can be applied to in-situ remediation of soil polluted by various alkaline Cr (VI), the process is simple and rapid, the applicability is good, and the remediation effect is good.

Description

technical field [0001] The invention relates to the technical field of soil pollution remediation, in particular to a sulfurized nano zero-valent iron-acid activated montmorillonite composite material, a preparation method thereof and its application in Cr(VI) contaminated soil remediation. Background technique [0002] Due to the improper stockpiling and treatment of chromium-containing waste residue and wastewater in history, the problem of Cr-contaminated soil in my country is very serious. Cr-contaminated soil sites are mainly concentrated in industrial land and industrial waste land. Aiming at the problem of Cr-contaminated soil, the current domestic and foreign research ideas mainly include: 1. Change the occurrence form of Cr in the soil, reduce Cr(Ⅵ) to relatively less toxic Cr(Ⅲ), reduce its migration ability and biological Availability (such as reduction stabilization technology, electric remediation technology board); Second, the removal of Cr from contaminated s...

Claims

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Application Information

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IPC IPC(8): C09K17/08
CPCC09K17/08
Inventor 杨卫春张晓明杨志辉李晓敏石岩廖骐王海鹰李青竹熊子璇
Owner CENT SOUTH UNIV
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