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Preparation method and application of nanometer zero-valent ion composite material

A technology of nano-zero-valent iron and composite materials, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of loss of nano-characteristics, reduced reactivity, strong reactivity, etc., and achieve improved removal rate , solve the effect of agglomeration and activity reduction

Active Publication Date: 2017-05-31
山西省环境科学研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, highly active nano-zero-valent iron particles have large specific surface area, strong reactivity, easy oxidation, and poor stability. Due to the small particle size and large surface energy and the magnetic force between particles, they are very easy to agglomerate, making nano-zero-valent iron particles The size of iron particles becomes larger, loses many nano-characteristics based on small size, and the reactivity decreases, which affects its practical application value

Method used

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  • Preparation method and application of nanometer zero-valent ion composite material

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[0027] Because the nano zero-valent iron particles are easy to agglomerate, the particle size becomes larger, loses many nano-characteristics based on small size, and reduces the reactivity. Many studies at home and abroad have loaded nano-zero-valent iron on montmorillonite, bentonite, activated carbon, resin and other carriers to enhance its dispersion, but there are few reports on using biochar as a carrier, especially in the application of removing lead ions in water. has not been reported yet. Biochar (biochar) refers to the stable, highly aromatic carbon-rich solid material produced by high-temperature slow pyrolysis (usually <700 °C) of raw materials such as biomass and fossil fuels under oxygen-limited conditions. From the microstructure point of view, most biochars are composed of tightly packed and highly twisted aromatic ring sheets, with remarkable porosity. Compared with other carriers, biochar has a tubular porous structure and a larger specific surface area, wh...

Embodiment 1

[0041] Clean the corn stalks, dry them in an oven at 80°C for 48 hours, crush them, and set aside;

[0042] The crushed corn stalks were put into a crucible, placed in an anaerobic tube furnace, and fed with nitrogen for 30 minutes. Carbonize at 100°C for 1 hour, and carbonize at 400°C for 3 hours (heating rate is 10°C / min). After pyrolysis and cooling, take out the carbonized material, grind and pulverize it with a mortar, pass through an 80-mesh sieve, and make powdery biochar;

[0043] Under the condition of 85°C, modify the powdery biochar with 10% nitric acid solution for 8 hours, wash it with ultrapure water until neutral, dry it at 80°C, put it into a brown bottle and put it in a desiccator for later use;

[0044] 1gFeSO 4 •7H 2 O dissolved in 100mL ethanol solution (V 水 :V 乙醇 =1:4), ultrasonically oscillated for 5 minutes to make ferrous sulfate ethanol solution. The prepared ferrous sulfate solution and 1g of biochar powder were placed in a 500mL three-necked fl...

Embodiment 2

[0048] Clean the corn stalks, dry them in an oven at 80°C for 48 hours, crush them, and set aside;

[0049] The crushed corn stalks were put into a crucible, placed in an anaerobic tube furnace, and fed with nitrogen for 30 minutes. Carbonize at 100°C for 1 hour, and carbonize at 400°C for 3 hours (heating rate is 10°C / min). After pyrolysis and cooling, take out the carbonized material, grind and pulverize it with a mortar, pass through an 80-mesh sieve, and make powdery biochar;

[0050] Under the condition of 85°C, modify the powdery biochar with 20% nitric acid solution for 8 hours, wash it with ultrapure water until neutral, dry it at 80°C, put it into a brown bottle and put it in a desiccator for later use;

[0051] 1gFeSO 4 •7H 2 O dissolved in 100mL ethanol solution (V 水 :V 乙醇 =1:4), ultrasonically oscillated for 5 minutes to make ferrous sulfate ethanol solution. The prepared ferrous sulfate solution and 1g of biochar powder were placed in a 500mL three-necked fl...

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Abstract

The invention relates to a nanometer zero-valent ion composite material and a preparation method thereof. The preparation method comprises the steps that corn straw biochar is prepared, modified by being soaked with nitric acid, washed to be neutral and then dried for use; FeSO4.7H2O is reduced into zero-valent iron in a nitrogen environment through a liquid phase reduction method, and the zero-valent iron is loaded on the biochar; solid-liquid separation is conducted on the solution obtained after reacting, and the biochar-loaded nanometer zero-valent ion composite material is obtained. The material is used for removing lead in underground water, the agglomeration and activity reduction problems of iron nanoparticles in the using process are solved, secondary contamination cannot be generated in repair practice, a removal experiment of the lead in the underground water is simulated in a constructed organic glass simulation reaction column, and the removal rate can reach 90% or above.

Description

technical field [0001] The invention relates to the field of water treatment and material preparation, in particular to a preparation method of a nanometer zero-valent iron composite material and its application in repairing heavy metal lead in water bodies. Background technique [0002] Lead is a typical heavy metal pollutant with strong toxicity. Lead can affect the metabolism of plant cells, harm human organs and the central nervous system, especially the most harmful to children's health and intellectual development. Groundwater is an important part of water resources. In recent years, with the increase of lead pollution incidents, it is imperative to restore lead-contaminated groundwater. Adsorption is one of the most studied methods for removing heavy metals in water, but common adsorbents are costly and difficult to regenerate. Therefore, research and development of new adsorbents with low cost, high adsorption efficiency, and environmental friendliness are current r...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F101/20
CPCC02F1/705C02F2101/20
Inventor 史晓凯刘利军党晋华韩文辉颜道浩白雪梅李磊
Owner 山西省环境科学研究院
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