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

A technology of composite materials and zero-valent iron, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of large-scale engineering applications, multiple chemical reagents, and less preparation, etc. problems, to achieve the effect of easy large-scale production and application, simple preparation process and short time-consuming

Active Publication Date: 2019-12-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 applications of vulcanized modified zero-valent iron composite material
  • Preparation method and applications of vulcanized modified zero-valent iron composite material
  • Preparation method and applications of 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 vulcanized modified zero-valent iron composite material preparation method, which comprises: (1) mixing pyrite and zero-valent iron according to a certain mass ratio, and putting the mixture into a ball milling tank; (2) adding ball-milling beads with a diameter of 3-12 mm, uniformly mixing the ball-milling beads, the pyrite and the zero-valent iron, and directly performing dry ball-milling without auxiliary agents and atmosphere; (3) setting the rotating speed of ball milling at 200-800 rpm, performing ball milling for 5-10 min each time, pausing for the same time, changing the ball milling steering, and sequentially circulating 3-6 times; and (4) after the ball milling is finished, screening with a 100-200 mesh sieve mesh, placing the collected vulcanized modified zero-valent iron composite material in a dryer so as to be stored. The method disclosed by the invention is simple in preparation process and low in cost, has reinforced removal effect on heavy metals and chlorinated organic pollutants in wastewater, 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 Applications(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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