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A kind of preparation method and application of biochar-supported iron-manganese material

A biochar and iron-manganese technology, applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve problems such as pollution, high treatment costs, and small scale

Active Publication Date: 2021-05-21
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Physical methods mainly include membrane method, electrocoagulation method, electrodialysis method, etc. The treatment effect is very good, but the scale is generally small, and the treatment cost is relatively high, and a certain degree of pretreatment is generally required; chemical methods generally include chemical precipitation, mixing Coagulation precipitation method, etc., the treatment effect is generally worse than the physical method, but the treatment scale is more flexible and the applicable conditions are wider. However, due to the addition of chemical agents, the chemical method may cause new pollution due to operational errors; physical and chemical methods include ion exchange. These methods have good effect on the treatment of fluorine pollutants, and the treatment scale is small, and certain pretreatment is also required, and the requirements for pretreatment are lower than those of physical methods.

Method used

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  • A kind of preparation method and application of biochar-supported iron-manganese material
  • A kind of preparation method and application of biochar-supported iron-manganese material
  • A kind of preparation method and application of biochar-supported iron-manganese material

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Embodiment 1

[0024] Such as figure 1 Shown is the flow chart of the preparation method of the biochar-loaded iron-manganese material in the embodiment of the present invention; the specific preparation process is as follows:

[0025] 1. Use corncobs as biomass materials and wash them with deionized water for 2 to 3 times, mainly to wash the dust and insect fragments on the surface;

[0026] 2. Dry it in an oven at 105°C for 24 hours, then crush it to a diameter of about 1 cm to obtain corncob powder;

[0027] 3. Put the corn cob powder into the quartz tube furnace, under the flowing nitrogen atmosphere, to isolate the air, raise the temperature of the corn cob powder to 400 °C according to the heating rate of 5 °C / min, keep the constant temperature state for 1 h, and the calcined product cool down;

[0028] 4. Grind the cooled calcined product and pass it through a 100-mesh sieve, wash the sieved product 2 to 3 times with deionized water, dry it at 60°C, wash the dried product with clean...

Embodiment 2

[0043] The steps in this example are basically the same as those in Example 1, except that in step 2, the drying temperature is 100°C; in step 3, the heating rate is 6°C / min; the calcination temperature is 380°C, and the constant temperature calcination time 2h; in step 4, the drying temperature is 70°C; in step 5, the mass of biochar is 90g, Fe 3+ , Fe 2+ and Mn 2+ The amount of substance is 1.8mol, 0.18mol and 0.9mol respectively, the quality of sodium acetate is 35g, the quality of polyethylene glycol is 24g, and the quality of urea is 45g; In step 6, the heating rate is 6 ℃ / min, and the calcining temperature is 210°C, the constant temperature calcination time is 2h; in step 7, the drying temperature is 80°C.

[0044] Under the condition that the initial fluorine concentration is 5mg / L of coalbed methane drainage, 2g of the biochar-loaded iron-manganese material prepared in this example is added to each liter of coalbed methane drainage, the adsorption time is 24h, and th...

Embodiment 3

[0046] The steps in this embodiment are basically the same as those in Example 1, except that in step 2, the drying temperature is 110°C; in step 3, the heating rate is 8°C / min; the calcination temperature is 420°C, and the constant temperature calcination time 3h; in step 4, the drying temperature is 80°C; in step 5, the quality of biochar is 110g, Fe 3+ , Fe 2+ and Mn 2+ The amount of substance is 2.2mol, 0.22mol and 1.1mol respectively, the quality of sodium acetate is 40g, the quality of polyethylene glycol is 28g, and the quality of urea is 50g; In step 6, the heating rate is 8 ℃ / min, and the calcination temperature is 230°C, the constant temperature calcination time is 3h; in step 7, the drying temperature is 70°C.

[0047] Under the condition that the initial fluorine concentration is 10mg / L of coalbed methane drainage, 3g of the biochar-loaded iron-manganese material prepared in this example is added to each liter of coalbed methane drainage, the adsorption time is 2...

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Abstract

The invention discloses a preparation method and application of a biochar-loaded iron-manganese material. The method is to combine biochar with Fe-containing 3+ , Fe 2+ and Mn 2+ Mix the aqueous solution, add dispersant, urea and pH buffering agent therein, maintain the pH value of the whole solution system at 3 to 4.5, stir well, get its mixed solution, collect the precipitate in the mixed solution; keep the temperature of the precipitate After anaerobic calcination for a period of time, the biochar-supported iron-manganese material can be obtained. This method loads iron and manganese elements on the biochar to form Fe-O and Mn-O functional groups. These functional groups have strong complexation ability with anion pollutants and make the surface of biochar rougher; the adsorption sites will be greatly increased. Compared with traditional adsorbents, the biochar-loaded iron-manganese material has enhanced physical adsorption and chemical complexation ability, and its adsorption capacity and adsorption performance for anion pollutants are further improved; and the preparation method is low in cost and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of groundwater fluorine pollution treatment, in particular to a preparation method and application of a biochar-loaded iron-manganese material. Background technique [0002] Fluoride is ubiquitous in the water environment and has become a global environmental problem. Fluorine pollution can come from natural activities such as the dissolution of fluorine-containing minerals, volcanic emissions, and marine aerosols; and in human production activities, coal combustion, steel production Fluoride pollution is also generated by various industrial processes such as semiconductor production, glass and ceramics manufacturing, and aluminum smelters. [0003] Coalbed methane drainage is the main pollution produced in coalbed methane mining, and fluorine is its main harmful substance, usually with a content of 5-20mg / L drainage. In my country's coalbed methane mining industry, due to the extensive discharge of coalbed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/14C02F103/10
CPCB01J20/0222B01J20/0229B01J20/20C02F1/281C02F1/283C02F2101/14C02F2103/10
Inventor 高旭波
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)