Preparation method and application of slow-release micro-nano zero-valent iron material

A micro-nano, zero-valent iron technology, applied in chemical instruments and methods, improvement of process efficiency, contaminated groundwater/leachate treatment, etc., can solve unfavorable carbon-coated iron material preparation, low conversion rate of humic acid, humic acid Low acid yield and other problems, achieve the effect of maintaining particle size and shape, low cost, and high conversion rate of raw materials

Active Publication Date: 2022-07-08
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, directly using biomass as raw material to prepare humic acid through hydrothermal conversion has low conversion rate, low yield of humic acid, unstable product and poor quality, which is not conducive to the preparation of carbon-coated iron materials.

Method used

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  • Preparation method and application of slow-release micro-nano zero-valent iron material
  • Preparation method and application of slow-release micro-nano zero-valent iron material
  • Preparation method and application of slow-release micro-nano zero-valent iron material

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Embodiment 1

[0047] A preparation method of slow-release micro-nano zero-valent iron material, comprising the following steps:

[0048] S1 biomass high temperature pretreatment

[0049] Grind the rice straw biomass raw materials into powder, and in a pyrolysis furnace, under nitrogen protection, the temperature is raised to 300 °C at a rate of 5 °C / min and maintained for 1 h, and after natural cooling, the pretreated raw materials are obtained by grinding;

[0050] Preparation of Humic Acid by Hydrothermal Alkali Catalysis of S2 Pretreated Raw Material

[0051] Weigh 1 g of the pretreated raw material and mix it with 50 g of 1M NaOH solution, transfer it to a 100 ml reaction kettle, heat it with water at 200 ° C for 12 h, and after natural cooling, the reaction solution is centrifuged to remove the residue, and under stirring conditions, use 2 M The pH of the reaction solution was adjusted by the strong acid solution to be less than 2, and stirring was continued for 30 min. After the humi...

Embodiment 2

[0055] A preparation method of slow-release micro-nano zero-valent iron material, comprising the following steps:

[0056] S1 biomass high temperature pretreatment

[0057] Grind the rice straw biomass raw materials into powder, and in a pyrolysis furnace, under nitrogen protection, the temperature is raised to 300 °C at a rate of 5 °C / min and maintained for 1 h, and after natural cooling, the pretreated raw materials are obtained by grinding;

[0058] Preparation of Humic Acid by Hydrothermal Alkali Catalysis of S2 Pretreated Raw Material

[0059] Weigh 1 g of the pretreated raw material and mix it with 50 g of 1M NaOH solution, transfer it to a 100 ml reaction kettle, heat it with water at 200 ° C for 12 h, and after natural cooling, the reaction solution is centrifuged to remove the residue, and under stirring conditions, use 2 M The pH of the reaction solution was adjusted by the strong acid solution to be less than 2, and stirring was continued for 30 min. After the humi...

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Abstract

The invention discloses a preparation method of a slow-release micro-nano zero-valent iron material, which comprises the following steps: by taking natural biomass as a raw material, firstly obtaining high-concentration and good-quality humic acid mother liquor through high-temperature pretreatment-hydrothermal alkali catalysis, and then simultaneously removing an oxide layer on the surface of zero-valent iron and self-assembling humic acid into a shell through acid regulation and control, thereby obtaining the slow-release micro-nano zero-valent iron material. The slow-release micro-nano zero-valent iron material with the core-shell structure is prepared, the assumption that the surface of micro-nano zero-valent iron is coated with a carbon layer in situ is achieved, and the oxidation resistance, the reaction activity and the slow release property of the micro-nano zero-valent iron material are improved.

Description

technical field [0001] The invention relates to the field of functional composite materials, in particular to a preparation method and application of a sustained-release micro-nano zero-valent iron material. Background technique [0002] Zero-valent iron is a chemically active metal with strong reducing ability, good electrochemical properties, coordination chemical properties, and environmental friendliness. It can directly reduce or indirectly catalyze the oxidation and degradation of pollutants, thereby reducing its Toxicity, showing the characteristics of environmental friendliness, low price, strong catalytic effect and wide application range, it has been used in industrial water treatment or groundwater remediation. Micro-nano zero-valent iron has better activation effect due to its larger specific surface area, which can make the oxidation reaction more efficient. However, the surface of micro-nano zero-valent iron is easily passivated, forming a dense oxide film, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C02F1/72C02F101/30C02F101/34C02F103/06
CPCB01J23/745B01J35/0086C02F1/725C02F1/722C02F2103/06C02F2101/30C02F2101/345Y02W10/37
Inventor 张鹏王新华孙红文王翠苹黄鹏
Owner NANKAI UNIV
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