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Preparation method of amino iron-carrying composite modified biochar

A technology of composite modification and biochar, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., to achieve the effect of simple method, excellent adsorption effect and high reduction efficiency

Inactive Publication Date: 2017-02-08
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the modification method of improving the removal efficiency of copper ions in sewage by using amino-supported iron composite modified biochar materials has not been reported in the literature.

Method used

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  • Preparation method of amino iron-carrying composite modified biochar
  • Preparation method of amino iron-carrying composite modified biochar
  • Preparation method of amino iron-carrying composite modified biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Preparation, characterization and application of amino-supported iron composite modified biochar

[0023] (1) Under the protection of nitrogen, sieve rice husks with a particle size of 40 mesh, place them in a high-temperature muffle furnace, and pyrolyze them at a high temperature of 800 ° C for 3 hours to obtain biochar raw materials;

[0024] (2) Add 50 mL of concentrated sulfuric acid and 50 mL of concentrated nitric acid in the environment of ice bath condensation and reflux, mix well, weigh 6 g of biochar raw material, add it to the mixed acid solution, and stir for 2 hours. After the reaction, use the mixed solution Rinse and filter with ionized water and isopropanol until neutral, and dry the obtained solid in a vacuum oven at 70°C to obtain nitrated biochar;

[0025] (3) Weigh 3 g of dried biochar material and 10 g of solid ferrous sulfate heptahydrate, add them into 150 mL of deionized water and isopropanol mixed solution, add acid dropwise to adjus...

Embodiment 2

[0033] Example 2: Effect of mixed acid mass ratio on the adsorption performance of biochar materials

[0034] (1) Under the protection of nitrogen, sieve rice husks with a particle size of 40 mesh, place them in a high-temperature muffle furnace, and pyrolyze them at a high temperature of 800 ° C for 3 hours to obtain biochar raw materials;

[0035] (2) Add 40mL of concentrated sulfuric acid and 40mL of concentrated nitric acid in the environment of ice bath condensation and reflux, mix well, and prepare 60mL of concentrated sulfuric acid and concentrated nitric acid in the same environment, each weighing 6g of biochar raw materials, adding into the mixed acid solution and stirred for 2 hours. After the reaction, the mixed solution was washed and filtered with deionized water and isopropanol until neutral, and the obtained solid was dried in a vacuum oven at 70°C to obtain nitrated biological carbon;

[0036] (3) Weigh 3g of dried biochar material and 10g of solid ferrous sul...

Embodiment 3

[0038] Example 3: Effects of pyrolysis temperature and holding time on the adsorption performance of biochar materials

[0039] (1) Under the protection of nitrogen, sieve rice husks with a particle size of 40 mesh, place them in a high-temperature muffle furnace, and pyrolyze them at 1000°C for 3 hours, 800°C for 3 hours, and 600°C. 5 hours, obtained biochar materials obtained by different pyrolysis temperatures and holding times;

[0040] (2) Add 50 mL of concentrated sulfuric acid and 50 mL of concentrated nitric acid in the environment of ice bath condensation and reflux, mix well, weigh 6 g of biochar raw materials respectively, add them to the mixed acid solution, and stir for 2 hours. After the reaction is completed, use the mixed solution with Rinse and filter with deionized water and isopropanol until neutral, and dry the obtained solid in a vacuum oven at 70°C to obtain nitrated biochar;

[0041] (3) Weigh 3g of dried biochar material and 10g of solid ferrous sulfat...

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Abstract

The invention discloses a preparation method of amino iron-carrying composite modified biochar. The method comprises the following steps: carrying out pyrolysis on the raw material crop straws under oxygen-free conditions to obtain a biochar material, carrying out nitro modification on the biochar, adding iron ions and a reducer in the absence of air, stirring at normal temperature, reducing the nitro on the biochar surface into amino by a one-step reduction process, and reducing the iron ions into zero-valent iron and attaching the zero-valent iron onto the biochar surface. The aminated iron-carrying composite modified biochar material has the advantages of favorable stability, high separability, environment friendliness and energy saving. The biochar material modified by the method uses heavy-metal-copper-ion-containing heavy metal wastewater as the adsorption object, has favorable adsorption and removal effects, and thus, has important application value in copper-ion-containing industrial sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of agricultural waste recycling and water treatment, and in particular relates to a preparation method of amino-loaded iron composite modified biochar. Background technique [0002] Heavy metal ion wastewater often contains copper ions. A small amount of copper can promote the growth of animals and plants, but the toxicity of copper ions can be enhanced through the enrichment of animal bodies. Excessive copper accumulation in the human body will cause many diseases such as high blood pressure, coronary heart disease, arteriosclerosis, and endanger the human body healthy. Adsorption method is a method of using adsorbent to absorb heavy metals in wastewater. Traditional adsorbents include natural substances such as activated carbon, zeolite, and clay minerals. Biochar obtained by pyrolysis of waste plant residues has the same properties as activated carbon, and has the advantages of large specific surface a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/70C02F101/20
CPCB01J20/20B01J20/3085B01J2220/4825C02F1/283C02F1/705C02F2101/20
Inventor 沈锦优刘佳王连军欧昌进张德锦侯成孙秀云李健生刘晓东韩卫清
Owner NANJING UNIV OF SCI & TECH
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