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Magnetic magnesium ferrite biochar composite microsphere phosphorus removal adsorbent, and preparation method and application thereof

A technology of composite microspheres and phosphorus adsorbents, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., can solve problems such as limiting the industrialization of biochar application materials, fixed bed clogging, and easy shedding , to achieve the effect of preventing the loss of nano-magnesium ferrite, good regeneration, and increasing mass transfer performance

Inactive Publication Date: 2020-09-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the exposed nano-magnesium ferrite particles are directly exposed to the water body and are easy to fall off, and the powdered adsorbent is easy to cause the fixed bed to be blocked.
These factors limit the application of biochar in practical engineering and the development of material industrialization

Method used

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  • Magnetic magnesium ferrite biochar composite microsphere phosphorus removal adsorbent, and preparation method and application thereof
  • Magnetic magnesium ferrite biochar composite microsphere phosphorus removal adsorbent, and preparation method and application thereof
  • Magnetic magnesium ferrite biochar composite microsphere phosphorus removal adsorbent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 0.03mol MgCl 2 and 0.06mol FeCl 3 Dissolve in 100mL of ultra-pure water, add 5.0g of reed biomass powder, stir evenly, add 1mol / L NaOH solution drop by drop to pH 11, vibrate at 150rpm at 70°C for 2h, filter, wash and dry . Add the precursor to an aqueous solution of sodium alginate (mass concentration of 2% w / v), stir evenly, and drop the mixed slurry into the crosslinking solution of lanthanum chloride (mass concentration of 3% w / v) with a dropper , to obtain cross-linked pellets, after hardening for 15 hours, wash and dry. The dried pellets were placed in a tube furnace and pyrolyzed at 600° C. for 2 h under the protection of nitrogen to obtain a magnetic magnesium ferrite biochar composite microsphere phosphorus-removing adsorbent.

Embodiment 2

[0041] 0.03mol MgCl 2 and 0.05mol FeCl 3 Dissolve in 100mL of ultra-pure water, add 5.0g of reed biomass powder, stir evenly, add 1mol / L NaOH solution drop by drop to pH 11, vibrate at 150rpm at 70°C for 2h, filter, wash and dry . Add the precursor to the sodium alginate aqueous solution (mass concentration is 3% w / v), after stirring evenly, drop the mixed slurry into the cross-linking solution of lanthanum chloride (mass concentration is 4% w / v) with a dropper , to obtain cross-linked pellets, after hardening for 15 hours, wash and dry. The dried pellets were placed in a tube furnace and pyrolyzed at 700°C for 2 hours under the protection of nitrogen to obtain a magnetic magnesium ferrite biochar composite microsphere phosphorus-removing adsorbent.

Embodiment 3

[0043] 0.03mol MgCl 2 and 0.05mol FeCl 3Dissolve in 100mL of ultra-pure water, add 5.0g of reed biomass powder, stir evenly, add 1mol / L NaOH solution drop by drop to pH 11, vibrate at 150rpm at 70°C for 2h, filter, wash and dry . Add the precursor to the sodium alginate aqueous solution (mass concentration is 3% w / v), after stirring evenly, use a dropper to drop the mixed slurry into the crosslinking solution of lanthanum chloride (mass concentration is 5% w / v) , to obtain cross-linked pellets, after hardening for 15 hours, wash and dry. The dried pellets were placed in a tube furnace and pyrolyzed at 800°C for 2 hours under the protection of nitrogen to obtain a magnetic magnesium ferrite biochar composite microsphere phosphorus-removing adsorbent.

[0044] From figure 1 It can be seen that the prepared example 3 becomes reddish brown, and the diameter of the microspheres is between 2.5-3.5mm, and has stronger magnetic properties ( figure 1 middle g-h). The surface of b...

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Abstract

The invention discloses a magnetic magnesium ferrite biochar composite microsphere phosphorus removal adsorbent, and a preparation method and application thereof. The magnetic magnesium ferrite biochar composite microsphere phosphorus removal adsorbent is prepared by using reed as a raw material and conducting magnesium ferrite modification, lanthanum alginate embedding and balling and high-temperature carbonization. A magnetic magnesium ferrite biochar composite microsphere prepared by the method has a diameter of 2.5-3.5 mm, has high adsorption capacity on phosphate, and is excellent in masstransfer performance and regeneration effect; magnetic magnesium ferrite modified biochar is wrapped in the porous microsphere, so the loss of nanometer magnesium ferrite is prevented, the mass transfer performance of the microsphere is improved, and meanwhile, the effective recovery and regeneration of the adsorbent are realized by utilizing the advantages of easy settling performance of the microsphere and the magnetism of the magnesium ferrite in the microspheres; and the preparation method has the advantages of easy availability of raw materials, simple technique and mild conditions, andis suitable for large-scale industrial production and use.

Description

technical field [0001] The invention belongs to the field of adsorbent preparation and wastewater treatment, and relates to a magnetic magnesium ferrite biochar composite microsphere dephosphorization adsorbent and a preparation method and application thereof. Background technique [0002] Phosphorus is one of the very important non-metallic mineral resources that are difficult to regenerate on the earth, and it is also the main limiting factor that causes water eutrophication. When the phosphorus content in water is greater than 0.018mg·P / L, it will cause a substantial increase in plankton. Therefore, it is necessary to strictly control the phosphorus content in wastewater. Adsorption is widely used in water phosphorus removal technology. [0003] Biochar has a wide range of sources, is cheap, and has rich pore structures and surface functional groups. It is often used as an adsorbent for the removal of pollutants in water bodies. However, the surface of biochar is mainl...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/10
CPCB01J20/20B01J20/28009B01J20/28021B01J20/3028B01J20/3078B01J2220/4825C02F1/288C02F2101/105
Inventor 王丽王靖宜冯江涛李珊珊杨柳
Owner XI AN JIAOTONG UNIV
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