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Preparation method and application of biochar/iron oxide composite material

A technology of composite materials and iron oxides, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve problems such as restriction removal, achieve good effect and good effect of repeated use

Inactive Publication Date: 2019-11-15
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large amount of negative charge on the surface of biochar restricts its removal of anionic pollutants in aqueous solution.

Method used

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  • Preparation method and application of biochar/iron oxide composite material
  • Preparation method and application of biochar/iron oxide composite material
  • Preparation method and application of biochar/iron oxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Pass the fruit shell biochar pyrolyzed at 900°C through a 200-mesh sieve.

[0041] (2) Weigh 5 g of fruit shell biochar, 2.7 g of ferric chloride hexahydrate and 1.0 g of ferrous chloride tetrahydrate into a 250 mL beaker, dissolve in 100 mL of distilled water, and record it as solution A; prepare 1 mol of / L NaOH solution, denoted as solution B.

[0042] (3) The solution A was sonicated for 0.5 h until it was evenly mixed, then added to a four-necked flask, and stirred for 1.5 h at an ambient temperature of 60 °C, a rotational speed of 140 r / min, and a nitrogen atmosphere. Add solution B dropwise to the suspension in the four-neck flask, adjust the pH to about 10, and stir at 90°C for 1.5 h.

[0043] (4) After the reaction is completed, the mixed solution is washed until neutral, and the obtained precipitate is freeze-dried for later use.

[0044]At room temperature, 0.06 g of biochar / magnetite composite material was added to 20 mL of 8 mg / L phosphate solution, s...

Embodiment 2

[0046] (1) Pass the fruit shell biochar pyrolyzed at 900°C through a 200-mesh sieve.

[0047] (2) Weigh 5 g of fruit shell biochar, 7.6 g of ferric chloride hexahydrate and 2.8 g of ferrous chloride tetrahydrate into a 250 mL beaker, dissolve with 100 mL of distilled water, and record it as solution A; prepare 1 mol of / L NaOH solution, denoted as solution B.

[0048] (3) The solution A was sonicated for 0.5 h until it was evenly mixed, then added to a four-necked flask, and stirred for 1.5 h at an ambient temperature of 60 °C, a rotational speed of 140 r / min, and a nitrogen atmosphere. Add solution B dropwise to the suspension in the four-neck flask, adjust the pH to about 10, and stir at 90°C for 1.5 h.

[0049] (4) After the reaction is completed, the mixed solution is washed until neutral, and the obtained precipitate is freeze-dried for later use.

[0050] At room temperature, 0.06 g of biochar / magnetite composite material was added to 20 mL of 8 mg / L phosphate solution...

Embodiment 3

[0052] (1) Pass the fruit shell biochar pyrolyzed at 900°C through a 200-mesh sieve.

[0053] (2) Weigh 5 g of fruit shell biochar and 2.5 g of ferric nitrate nonahydrate into a 250 mL beaker, add 50 mL of distilled water, and stir with high-speed magnetic force for 0.5 h. Add 1 mol / L KOH dropwise to the above mixed solution, adjust the pH to about 7, and continue stirring for 0.5 h.

[0054] (3) After the reaction is completed, the mixed solution is washed until neutral, and the obtained precipitate is vacuum-dried at 60°C for later use.

[0055] At room temperature, 0.05 g of biochar / ferrihydrite composite material was added to 20 mL of 8 mg / L phosphate solution, shaken for 4 h, and the adsorption rate reached 15.5%.

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Abstract

The invention relates to a preparation method and application of a biochar / iron oxide composite material. Iron oxide particles are loaded to the surface of biochar by a simple coprecipitation method to form the composite material with good pore structure and large specific surface area, and the composite material is applied to removal of phosphates in aqueous solutions. The synthesis conditions ofbiochar / iron oxide are studied to compare the phosphate removal effect of the synthesized material. By studying the adsorption properties of the biochar / iron oxide composite material on phosphates inwater, optimal adsorbent dosage, adsorption time, adsorption concentration and other values can be obtained. Biochar has a porous structure and large surface area, also has wide sources, and is low in cost. The surface of the iron oxide contains a lot of hydroxyl radicals, which can be converted into positively charged adsorption sites. The biochar / iron oxide composite material prepared by the method has good removal ability on phosphates in water, and also has strong stability and recyclability.

Description

technical field [0001] The invention relates to the field of phosphate pollution treatment in sewage, in particular to a biochar / iron oxide composite material. Background technique [0002] With the continuous expansion of human industrial activities and urbanization, the problem of water eutrophication has gradually intensified and has become a global environmental problem. Eutrophication of water body can lead to excessive reproduction of characteristic algae such as blue-green algae, reduce the transparency of water body, and cause a sharp drop in dissolved oxygen content, which seriously damages the ecological system environment such as lakes and reservoirs. Domestic and foreign studies have shown that phosphorus is the key factor causing water eutrophication. Phosphorus is a very important mineral element in life, but if there is excessive phosphorus in the water body, the water quality will deteriorate and water shortages will occur. Therefore, the phosphorus removal...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/10
CPCB01J20/06B01J20/20B01J2220/42B01J2220/4806C02F1/281C02F2101/105
Inventor 张照然闫良国
Owner UNIV OF JINAN
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