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Preparation method and application of green synthesis novel iron-carbon material

A green synthesis and new technology, applied in chemical instruments and methods, metal processing equipment, transportation and packaging, etc., can solve the problems of reduced activity, degradation rate, limited preservation and service life, etc., to achieve strong antioxidant capacity, prevent The effect of agglomeration and prevention of deactivation

Inactive Publication Date: 2019-12-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the outstanding problems currently restricting the application of zero-valent iron are: (1) The surface is easily passivated during use and storage, which limits its preservation and service life, and occupies the reactive sites on the surface of the material, preventing it from contacting with pollutants , so that the activity is reduced and the degradation rate is reduced; (2) In practical applications, due to the magnetic force and van der Waals force, the particles attract each other and aggregate into micro-scale or even larger particles, thus affecting their reactivity and migration and diffusion capabilities
At present, most of the biochar materials are crop straws, fruit shells, vegetables, sawdust and sludge, etc. There are relatively few studies on the use of aquatic plants to make biochar.

Method used

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  • Preparation method and application of green synthesis novel iron-carbon material
  • Preparation method and application of green synthesis novel iron-carbon material
  • Preparation method and application of green synthesis novel iron-carbon material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Pretreatment of biomass materials: Wash the duckweed with deionized water, dry it at 60-80°C, crush it to 20-50mm with a grinder, and set it aside.

[0028] (2) Preparation of biochar: The biomass material in step (1) was placed in a porcelain boat and placed in a tube furnace under N 2 Pyrolysis was carried out in the atmosphere, the initial temperature was 40°C, and the temperature was raised to 600°C at a heating rate of 5°C / min, and kept for 2 hours to obtain biochar, which was ground and passed through a 100-mesh sieve for later use.

[0029] (3) Preparation of red clover extract: weigh 6g of red clover powder, place it in a 250mL round bottom flask, add a certain amount of mixture of absolute ethanol and deionized water (volume ratio V 水 :V 乙醇 =4:6), placed in an ultrasonic cleaner, refluxed in a water bath at 60°C for extraction, and transferred to a sample bottle after centrifugal filtration.

[0030] (4) Preparation of iron salt solution: 4.47gFeSO 4 ﹒ ...

Embodiment 2

[0036] The new iron-carbon material prepared was applied to the removal experiment of Cr(Ⅵ) in water. Take 0.10 g of the new iron-carbon material and add it to 100 mL of Cr(VI) solution with a concentration of 50 mg / L, put it into a constant temperature shaking box and shake it at room temperature at a speed of 100 r / min for 3 hours. In the middle, samples were taken at 10 min, 30 min, 60 min, 90 min, 120 min and 180 min, filtered with a 0.45 μm filter, and the concentration of Cr(VI) in the sample was measured by ultraviolet spectrophotometry, and the new iron-carbon material was obtained. Cr(Ⅵ) degradation curve.

Embodiment 3

[0038] The new iron-carbon material prepared was applied to the removal experiment of methylene blue in water. Take 0.05g of the new iron-carbon material and add it to 60mL of methylene blue solution with a concentration of 0.1g / L, put it into a constant temperature shaking box and shake it at room temperature at a speed of 100r / min for 1h. Samples were taken at 10 min and 30 min in the middle, filtered with a 0.45 μm filter, and the absorbance was measured at a wavelength of 664 nm with a spectrophotometer to obtain the degradation curve of the new iron-carbon material to methylene blue.

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Abstract

The invention relates to the field of preparation and application of environmental remediation materials, in particular to a preparation method of a green synthesis novel iron-carbon material. The preparation method is characterized in that red clover extract is adopted as a reducing agent to replace NaBH4 for preparing zero-valent iron. In addition, according to the preparation, duckweeds are adopted as a biochar raw material; soluble starch is added into a biochar / zero-valent iron system; the biochar, the soluble starch and the zero-valent iron are combined; the starch can serve as a good template or a good dispersing agent to promote dispersion of nano-iron; meanwhile, the starch is better stabilized on the biochar, and accordingly, the removal effect of the material on pollutants is improved. The invention provides a high-efficiency and environment-friendly environmental remediation material. The problem that zero-valent iron is agglomerated and passivated easily is solved. The removal efficiency of the material on the pollutants is improved. Moreover, the synthetic method is green and free of pollution.

Description

technical field [0001] The invention relates to the field of preparation of environmental restoration materials, in particular to a preparation method of a green synthetic new-type iron-carbon material. Background technique [0002] Since the 1980s, zero-valent iron has gradually become the research focus of environmental remediation materials due to its non-toxic, abundant content, cheap and easy production, and good effect on pollutant removal. However, the outstanding problems currently restricting the application of zero-valent iron are: (1) The surface is easily passivated during use and storage, which limits its preservation and service life, and occupies the reactive sites on the surface of the material, preventing it from contacting with pollutants , so that the activity is reduced and the degradation rate is reduced; (2) In practical applications, due to the magnetic force and van der Waals force, the particles attract each other and aggregate into micro-scale or ev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02C02F1/28C02F1/70C02F101/22C02F101/38
CPCB22F9/24C02F1/283C02F1/70C02F2101/22C02F2101/38C02F2101/40B22F1/054B22F1/17
Inventor 林爱军杨春杨文杰
Owner BEIJING UNIV OF CHEM TECH
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