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Pyrolytic carbon loaded zero-valent iron composite material, and preparation method and application thereof

A composite material and pyrolytic carbon technology, which is applied in the field of pyrolytic carbon-loaded zero-valent iron composite materials and their preparation, can solve the problems of lack of composite material characterization data, inaccurate judgment, and long time required to improve the removal of heavy metals Ability, electrochemical performance advantage, time-consuming effect

Pending Publication Date: 2020-03-27
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned pyrolytic reduction method can effectively prepare pyrolytic carbon zero-valent iron composite materials, there are also some shortcomings. For example, it is necessary to set up a condensation reflux device and an exhaust port baffle during microwave pyrolysis; Iron salt as the precursor of ZVI; pyrolysis temperature 500 o C, the temperature is low and the characterization data of the composite material in this technology is lacking, so it cannot be accurately judged whether the zero-valent iron particles are successfully loaded
During dry distillation, the temperature needs to be raised several times and the heating rate is slow, and the time required is long; choose Fe 2 o 3 , Fe 3 o 4 Pure reagent is iron source, high cost

Method used

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  • Pyrolytic carbon loaded zero-valent iron composite material, and preparation method and application thereof
  • Pyrolytic carbon loaded zero-valent iron composite material, and preparation method and application thereof
  • Pyrolytic carbon loaded zero-valent iron composite material, and preparation method and application thereof

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preparation example Construction

[0051] The preparation method of the pyrolytic carbon loaded zero-valent iron composite material prepared by the one-step method in this embodiment, the steps are:

[0052] Step 1: Mix pine wood biomass and natural hematite powder according to the mass ratio of 1:5 (1:6—1:4), add an appropriate volume of water to immerse the mixed raw materials, and perform ultrasonic treatment for 30 minutes. The material is put into the drying box, 60 o Dry under C conditions;

[0053] The second step: the dried material obtained in the first step is placed in a tube furnace, and pyrolyzed with limited oxygen under a hydrogen-argon mixed gas atmosphere, with 5 o C / min heating rate at target temperature 1000 o Pyrolysis at C for 1 h;

[0054] The third step: collect the solid material obtained in the second step, wash it alternately with ethanol and deionized water for three to five times, and place it in a vacuum drying oven for 60 o C collected after drying for 24 h, marked as composite...

example 1

[0067] The natural hematite powder and the crushed pine biomass are mixed according to the mass ratio of 1:5, and an appropriate volume of water is added to ultrasonically mix evenly, and then put into an oven for drying. Then the dried material was placed in a tube furnace, under a hydrogen-argon gas mixture atmosphere, at 600 o Pyrolyze at 0°C, collect the resulting solid material, wash, dry, grind, and collect. Pure hematite powder was also prepared under the same pyrolysis conditions. X-ray diffraction pattern (XRD) such as figure 1 Shown, 600 o The C composite material has a weaker zero-valent iron characteristic peak, while the 600 o C hematite still exists in the form of iron oxide after pyrolysis, and no zero-valent iron is generated.

example 2

[0069] The natural hematite powder and the crushed pine biomass are mixed according to the mass ratio of 1:5, and an appropriate volume of water is added to ultrasonically mix evenly, and then put into an oven for drying. Then the dried material was placed in a tube furnace, under a hydrogen-argon mixed gas atmosphere, at 800 o Pyrolyze at 0°C, collect the resulting solid material, wash, dry, grind, and collect. Pure hematite powder was also prepared under the same conditions. X-ray diffraction pattern (XRD) such as figure 1 Shown, 800 o The characteristic peak of zero-valent iron in C composite material is obvious (2θ=44.8 o ) and high purity, while 800 o Although C hematite produces a small amount of zero-valent iron, other iron oxides still exist.

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Abstract

The invention discloses a pyrolytic carbon loaded zero-valent iron (ZVI) composite material, and a preparation method and an application thereof. The method comprises the following steps: mixing natural hematite powder with crushed pine biomass according to a mass ratio, adding water, performing ultrasonic dispersion, drying the obtained raw material mixture, putting the obtained dried raw material mixture into a tubular furnace, carrying out oxygen-limiting pyrolysis in a hydrogen-argon mixed gas atmosphere, raising the temperature to a target temperature of 800-1500 DEG C at a preset heatingrate, and carrying out joint pyrolysis on pine biomass and natural hematite (the main component is Fe2O3) to reduce Fe2O3 into ZVI and generate the composite material PC / ZVI. Doping with graphene and / or p-benzoquinone can supplement functional group loss of a carbon material after high-temperature pyrolysis, further promotes zero-valent iron electron transfer and remarkably improves the heavy metal removal capacity.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration materials, and in particular relates to a pyrolytic carbon-loaded zero-valent iron composite material and a preparation method and application thereof. Background technique [0002] The situation of metal pollution in water bodies is severe. Compared with other treatment methods, adsorbent-based technology is a commonly used sewage treatment method. Commonly used adsorbents such as activated carbon, zeolite, etc. have a good removal effect on cationic heavy metals such as lead, but have poor removal effects on anionic heavy metals and metalloids, and most of the adsorbent materials are not easy to separate after treatment, and the cost is high. The widespread and effective application of the technology is greatly limited. Based on this, it is the general trend to prepare water heavy metal pollution remediation materials with good adsorption performance, high removal efficiency a...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F1/46C02F101/22
CPCB01J20/20B01J20/28009C02F1/283C02F1/46C02F2101/22
Inventor 王圣森赵明月杨仙妮王小治尹微琴赵海涛
Owner YANGZHOU UNIV
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