Preparation method of nano zero-valent iron loaded hydrophilic porous biochar composite material

A technology of nano-zero-valent iron and composite materials, which is applied in the direction of water pollutants, chemical instruments and methods, and alkali metal compounds, etc., can solve the problems of low performance of adsorption and removal of heavy metals, instability of nano-zero-valent iron, and high cost of substrates. Achieve the effect of increasing utilization value, reducing synthesis cost and improving utilization efficiency

Active Publication Date: 2018-11-02
NORTHEAST AGRICULTURAL UNIVERSITY
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high cost of the existing substrates loaded with metal particles, unstable and prone to agglomeration of nano-zero-valent iron, and low performance in the process of applying adsorption to remove heavy metals, and to provide a nano-zero-valent iron-loaded pro- Preparation method of water-based porous biochar composite material

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  • Preparation method of nano zero-valent iron loaded hydrophilic porous biochar composite material
  • Preparation method of nano zero-valent iron loaded hydrophilic porous biochar composite material
  • Preparation method of nano zero-valent iron loaded hydrophilic porous biochar composite material

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specific Embodiment approach 1

[0028] Specific embodiment 1: This embodiment is a preparation method of nano zero valent iron supported hydrophilic porous biochar composite material, which is specifically completed according to the following steps:

[0029] 1. Biomass pyrolysis molten salt activation:

[0030] ① Cut and crush the raw material of biochar, wash it 5-10 times with distilled water, and then dry it at a temperature of 70℃~90℃, and then pass the dried biochar raw material through a 100-200 mesh sieve to obtain a biological Fine powder of carbon raw materials;

[0031] ②. Grind and mix the fine powder of biochar raw material and metal salt to obtain reactants; place the reactants in a tube furnace, pass inert gas into the tube furnace, and heat the tube furnace to 700 under the protection of inert gas ℃~900℃, and then pyrolyze 1h~3h under the protection of inert gas atmosphere at 700℃~900℃ to obtain porous biochar material after pyrolysis and carbonization;

[0032] The inert gas mentioned in step 1 ② is...

specific Embodiment approach 2

[0048] Specific embodiment two: this embodiment is different from specific embodiment one in that: the biochar raw material mentioned in step one ① is one or several of corn stalk, wheat stalk, soybean stalk, rice stalk and rice husk mixture. Others are the same as the first embodiment.

specific Embodiment approach 3

[0049] Specific embodiment three: this embodiment is different from specific embodiment one or two in that the metal salt described in step one (2) is KHCO 3 Or NaHCO 3 . Others are the same as the first or second embodiment.

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Abstract

The invention discloses a preparation method of a nano zero-valent iron loaded hydrophilic porous biochar composite material, relates to preparation methods of hydrophilic porous biochar composite materials, and aims to solve the problems that an existing matrix loading metal particles is high cost, and nano zero-valent iron is unstable and prone to agglomeration and is low in performance when being applied to heavy metal adsorption. The method includes the steps of firstly, subjecting biomass to pyrolysis and molten salt activation; secondly, preparing a hydrophilic porous biochar material; thirdly, loading the nano zero-valent iron to obtain the nano zero-valent iron loaded hydrophilic porous biochar composite material. The specific surface area of the prepared nano zero-valent iron loaded hydrophilic porous biochar composite material can reach 603.4m<2>*g<-1>. Due to the fact that corn straw is agricultural waste which is low in cost and wide in source, the cost of the preparation method is lowered by using the pyrolysis product of the corn straw as the matrix material. The prepared nano zero-valent iron loaded hydrophilic porous biochar composite material is applicable to the field of environmental pollution remediation.

Description

Technical field [0001] The invention relates to a preparation method of a hydrophilic porous biochar composite material. Background technique [0002] Nano-zero-valent iron is an environmentally friendly material with the advantages of small particle size, large surface area, strong reduction ability, and fast reaction speed. Therefore, nano-zero-valent iron is widely used in the field of water restoration. However, because nano-zero-valent iron has poor stability in the air and is difficult to store, it easily reacts with water or oxygen in the surrounding medium, resulting in the formation of an oxide layer to inhibit further reactions with pollutants. In addition, due to its high surface energy, nano-zero-valent iron is easily aggregated into larger particles, thereby reducing the reaction activity, and therefore, the utilization rate of nano-zero-valent iron is low. [0003] In recent years, the use of silica, polymers, clay minerals, activated carbon, graphene, carbon nanotu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/0229B01J20/20B01J20/28064B01J2220/4825C02F1/281C02F2101/20
Inventor 杨帆张帅帅李天霄
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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