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mg/Fe oxide modified biochar nanocomposite material and preparation method thereof

A nanocomposite material and biochar technology, applied in the field of materials, can solve the problems of high energy and chemical substance consumption, slow reaction rate, long reaction time, etc., to increase adsorption sites and active sites, enrich types and quantities, The effect of optimizing the pore structure

Active Publication Date: 2021-12-03
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the present stage, the sulfate radical advanced oxidation method still has some shortcomings in the application of water treatment: some methods have extreme reaction conditions, consume a lot of energy and chemical substances, and have secondary pollution risks, so they cannot be put into large-scale water treatment
However, the original biochar has the following problems in the actual use process: first, the reaction rate is slow, and it takes a long time for the reaction to achieve the adsorption equilibrium and high adsorption effect of the antibiotic, so it cannot remove the water body effectively in time. Antibiotic contamination in
Second, the specific surface area, pore volume and pore size of the original biochar are relatively small, the antibiotic removal efficiency is not high, and the pore characteristics and functionality are insufficient compared with conventional carbon materials (such as activated carbon, carbon nanotubes, graphene, etc.); Third, the special function of biochar is closely related to its pore structure, specific surface area, surface active functional groups, ash content, aromatization degree and other characteristics, and these characteristics are greatly affected by factors such as raw materials for biochar preparation, preparation process and pyrolysis conditions. Large, unmodified or functionally modified biochar has limited adsorption sites and active sites, which limits its application in actual wastewater treatment; Fourth, after the original biochar has completed the adsorption of antibiotics in water, it has no Separation characteristics, unable to achieve rapid solid-liquid separation in water, with the risk of causing secondary pollution

Method used

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  • mg/Fe oxide modified biochar nanocomposite material and preparation method thereof
  • mg/Fe oxide modified biochar nanocomposite material and preparation method thereof
  • mg/Fe oxide modified biochar nanocomposite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] A method for preparing a biochar nanocomposite material modified by Mg / Fe oxides of the present invention. In this embodiment, the raw material of biochar is corn stalks, and the composite material includes a biochar matrix, and the surface of the matrix is ​​loaded with roasted Mg / Fe oxidized The material is mainly made of corn stalk biomass mixed solution by adding water to corn stalk, and the mixed reaction of corn stalk biomass mixed solution and iron salt and magnesium salt powder is prepared to obtain corn stalk biomass iron and magnesium modified compound, which is passed through a tubular atmosphere furnace in N 2 It is obtained by pyrolyzing the corn stalk biomass iron-magnesium modified compound under the atmosphere, wherein the iron salt and magnesium salt powder are ferric salt and divalent magnesium salt powder.

[0042] A preparation method of the biochar nanocomposite material modified by the Mg / Fe oxide of the above-mentioned present embodiment, specifica...

Embodiment 2

[0051] A kind of biochar nanocomposite material modified by Mg / Fe oxide, its preparation method comprises the following steps:

[0052] (1) Collect waste corn stalks from the corn field, wash the corn stalks with deionized water, and then dry them at 60° C. until their moisture content is 10% to 15% (the drying time is 24 hours). The dried corn stalks are pulverized and passed through a 100-mesh sieve to obtain corn stalk powder.

[0053] (2) Take 5 g of the corn stalk powder obtained in step (1) and add it into deionized water for stirring and dispersing, specifically: stirring and dispersing for 30 minutes in a constant temperature water shaking box at 25°C at a speed of 200 r / min to obtain a mixed suspension A .

[0054] (3) Add 0.04M MgCl to the mixed suspension A obtained in step (2) 2 ·6H 2 O and 0.08M FeCl 3 ·6H 2 O mixed and stirred, the stirring speed was 600r / min, and the stirring time was 30min. At the same time, the sodium hydroxide solution was added dropwise...

Embodiment 3

[0064] A kind of application of biochar nanocomposite material modified by Mg / Fe oxide of the present invention in degrading antibiotics in water body, its application method comprises the following steps:

[0065] (1) Add 30 mL of 5 mg / L sulfamethazine solution, 5 mM ammonium persulfate, and 60 mg Mg / Fe oxide-modified biochar nanocomposite into the reaction vessel to obtain a mixed solution.

[0066] (2) With a concentration of 2mol / L sodium hydroxide solution and a concentration of 2mol / L hydrochloric acid solution, the pH of the mixed solution in the above step (1) is adjusted to 3 by a pH meter, and after 30 minutes of reaction, use a high-efficiency liquid phase Chromatography (HPLC) detects the remaining concentration of sulfamethazine.

[0067] The results show that, using the method of this example, the degradation efficiency of sulfamethazine is about 97.8%. Activated ammonium persulfate to treat sulfamethazine in water, the principle of action is as follows Figure...

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Abstract

The invention discloses a biochar nanocomposite material modified by Mg / Fe oxide and a preparation method thereof. The biochar nanocomposite material modified by Mg / Fe oxide uses biochar as a matrix, and Mg / Fe is oxidized on the surface of biochar. things. The preparation method is as follows: pulverize agricultural and forestry wastes and suspend them in water to obtain suspension A; add Mg 2+ and Fe 3+ , stirring and dispersing to obtain a suspension B; performing aging and co-precipitating to obtain a biomass iron-magnesium modified composite; performing pyrolysis under an inert atmosphere. The biochar nano-composite material modified by Mg / Fe oxide in the present invention has the advantages of low price and high efficiency, large-scale production, strong adsorption capacity, rapid solid-liquid separation, and environmental friendliness, and is applied to the degradation of activated persulfate The antibiotic pollution in the water body has good removal effect and fast reaction speed.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a Mg / Fe oxide-modified biochar nanocomposite material and a preparation method thereof. Background technique [0002] With the rapid development of the economy and the continuous adjustment of the industrial structure, the livestock and poultry breeding industry is increasingly developing in the direction of intensification and scale. In order to prevent and treat bacterial diseases and promote animal growth, antibiotics are widely used in agricultural production activities such as livestock and poultry farming and aquaculture. A large number of antibiotic pollutants are discharged into water bodies. These pollutants are large in quantity and slow in biodegradation rate. The continuous enrichment in the actual water body has caused chronic poisoning of microorganisms, algae, invertebrates, fish and amphibians in the water body and sediment, resulting in serious organic pollutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28C02F1/28C02F1/72B01J23/745B01J20/30C02F101/30
CPCB01J20/20B01J20/28009B01J23/002B01J23/78C02F1/283C02F1/725C02F2101/30
Inventor 张辰秦钒治张祥东曾光明王荣忠彭一娇宋歌方清萱
Owner HUNAN UNIV
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