Preparation method and application of a vulcanized modified zero-valent iron composite material

A composite material, zero-valent iron technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sludge/sewage treatment, etc. problem, to achieve the effect of good universality, wide pH working band, and short time consumption

Active Publication Date: 2021-07-09
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the wet vulcanization modification requires more chemical reagents and less preparation, so it cannot be applied in large-scale engineering; dry vulcanization such as ball-milled iron powder and sulfur powder can also play a role in vulcanization strengthening, but because of the spontaneous combustion of sulfur powder, it is necessary to create Anaerobic environment (such as nitrogen or argon), higher cost

Method used

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  • Preparation method and application of a vulcanized modified zero-valent iron composite material
  • Preparation method and application of a vulcanized modified zero-valent iron composite material
  • Preparation method and application of a vulcanized modified zero-valent iron composite material

Examples

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Effect test

preparation example 1

[0037] This embodiment provides a method for preparing a sulfide-modified zero-valent iron composite material.

[0038] The room temperature is 20±2°C. According to the mass ratio (in this example, pyrite: iron powder = 1:9), weigh an appropriate amount of pyrite (10 mesh) and zero-valent iron powder (200 mesh) and mix them, add 9mm oxide Zirconium ball milling beads are placed in a 100mL lined zirconia ball milling tank, set the ball milling speed to 600rpm, pause for 10 minutes after ball milling for 10 minutes, change the direction and ball mill again, and cycle three times, take out after a total of 30 minutes of ball milling, pass through a 100-mesh screen and collect in a centrifuge tube Store in a desiccator. The nitrogen content in the desiccator is 85%, and the humidity is 10%.

Embodiment 2

[0040] This example uses the composite material prepared in Preparation Example 1 to provide a water treatment method for degrading heavy metal Cr(VI) under anaerobic conditions.

[0041] The room temperature is 18°C, add 250ml of acetic acid-sodium acetate buffer solution to the 250ml reaction bottle, control its pH between 5.5-6.5, add 1mL of 5mg / ml Cr(VI) stock solution, and prepare the artificial Synthesize Cr(VI) wastewater, sample 1.5mL, add 0.3g iron powder (Fe 0bm ), pyrite (FeS 2 bm ), iron powder mixed with pyrite ((Fe 0 +FeS 2 ) bm ), after ultrasonic reaction for 10 minutes, the reaction bottle was then placed in an overturning oscillator at 120 rpm and 25°C for anoxic reaction for 1 hour, and the oxygen content in the wastewater was 2 mg / L.

[0042] The result is as figure 1 As shown, the reaction effect in 60min is (Fe 0 +FeS 2 ) bm >FeS 2 bm >Fe 0bm , conforms to pseudo-first-order kinetics before the end of the reaction, that is, (Fe0 +FeS 2 ) bm ...

Embodiment 3

[0044] This implementation uses the composite material prepared in Preparation Example 1 to provide a water treatment method for degrading high-concentration organic chloride CAP under anaerobic conditions.

[0045] The room temperature is 18°C, add 250ml deionized water, 8mM Na 2 SO 4 Electrolyte, dilute sulfuric acid to adjust the pH to 3±0.2, add 0.5mL 50mg / ml CAP stock solution to prepare synthetic CAP organic wastewater with a concentration of 100mg / L, sample 1.5mL, and then add 0.1g ball-milled iron Powder (Fe 0bm ), pyrite (FeS 2 bm ), iron powder mixed with pyrite ((Fe 0 +FeS 2 ) bm ), the reaction bottle was placed in an overturning shaker at 120 rpm and 25° C. for 1.5 hours of anoxic reaction, and the oxygen content in the waste water was 8 mg / L.

[0046] The result is as figure 2 As shown, within 90min there is (Fe 0 +FeS 2 ) bm , Fe 0bm , FeS 2 bm The removal rate is 60%, 28%, 0% respectively, and the reaction effect is (Fe 0 +FeS 2 ) bm >Fe 0bm ...

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Abstract

The invention discloses a method for preparing a sulfide-modified zero-valent iron composite material, which comprises the following steps: (1) mixing pyrite and zero-valent iron in a certain mass ratio and placing them in a ball mill; 3‑12mm ball milling beads are evenly mixed with pyrite and zero-valent iron, without additives and atmosphere, directly dry ball milling; (3) Set the ball milling speed to 200‑800rpm, each ball milling 5‑10min, pause for the same time, Change the direction of the ball mill, and cycle 3-6 times in sequence; (4) pass through a 100-200 mesh screen after the ball mill is finished, and collect the vulcanized modified zero-valent iron composite material and store it in a desiccator. The method disclosed by the invention has simple preparation process and low cost, has enhanced removal effect on heavy metals and chlorinated organic pollutants in waste water, and has large-scale production and engineering application prospects.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a preparation method and application of a vulcanized modified zero-valent iron composite material. Background technique [0002] At present, whether it is surface water or groundwater, the pollution is very serious, especially with the rapid development of mining, metallurgy, chemical industry, electroplating and other industries, as well as the accidental discharge of heavy metals or the use of a large amount of chemical fertilizers and pesticides, resulting in heavy metals in the water. The pollution problem is becoming more and more serious. Heavy metals are difficult to control, and they have relatively high stability and refractory degradation in water bodies. Therefore, after water bodies are polluted by heavy metals, they will cause lasting harm. Hexavalent chromium (Cr(VI)) is considered to be one of the most harmful chemical substances to the human body, wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F101/20C02F101/36
CPCC02F1/725C02F2101/20C02F2101/36
Inventor 赵珊代银顺段良凤孙诗文修齐杨晓薇宋超王曙光
Owner SHANDONG UNIV
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