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Synthesis method of magnetic phosphorus adsorbent based on lanthanum loaded fly ash beads

A synthesis method, phosphorus adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, silicon compounds, etc., can solve the problems of phosphorus removal, precipitation, and low efficiency of phosphorus removal in wastewater, and achieve good application prospects , simple process and low cost

Active Publication Date: 2017-01-11
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that although the fly ash magnetic bead adsorbent can achieve high-efficiency magnetic separation, the phosphorus removal efficiency of the fly ash magnetic beads itself is low, and the fly ash magnetic beads themselves contain traces of harmful heavy metal elements, which have the risk of precipitation, so they cannot meet the requirements. Wastewater Phosphorus Removal Demand

Method used

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  • Synthesis method of magnetic phosphorus adsorbent based on lanthanum loaded fly ash beads
  • Synthesis method of magnetic phosphorus adsorbent based on lanthanum loaded fly ash beads
  • Synthesis method of magnetic phosphorus adsorbent based on lanthanum loaded fly ash beads

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Experimental program
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Effect test

Embodiment 1

[0026] This embodiment prepares lanthanum-loaded fly ash magnetic beads according to the following steps:

[0027] 1) Through sieving, magnetic separation, ball milling and re-magnetic separation and other processes, obtain strong magnetic micro-magnetic beads with an average particle size of 4.6 μm, a specific saturation magnetization of 26.44emu / g, and an iron grade of 56.1%. Set aside to dry.

[0028] 2) Put 3 g of strong magnetic micro-magnetic beads in a beaker, add 100 mL of water, 400 mL of absolute ethanol and 25 mL of ammonia water with a mass concentration of 28%, and stir for 10 minutes to fully infiltrate and suspend the strong magnetic micro-magnetic beads state. 1.63 mL of tetraethyl orthosilicate with a mass concentration of 98.6% was added dropwise at a speed of 0.5 mL / min, and then electric stirring was performed at a speed of 500 r / min for 6 hours. Finally, solid-liquid separation is assisted by a strong NdFeB magnet, washed once with ethanol and water, and...

Embodiment 2

[0035] Using the lanthanum-loaded fly ash magnetic beads obtained in Example 1 to treat simulated phosphorus-containing wastewater, the maximum saturated phosphorus adsorption capacity of the lanthanum-loaded fly ash magnetic beads is 18.359 mg / g, compared with the strong magnetic micro-magnetic beads The adsorption capacity has increased by 258.8%. Systematic orthogonal experiments show that the saturated phosphorus adsorption capacity of lanthanum-loaded fly ash magnetic beads increases with the decrease of pH, and is close to the maximum value near pH=4.0; with the increase of temperature, the phosphorus adsorption capacity increases slightly. At the same temperature, the adsorption capacity of lanthanum-loaded fly ash magnetic beads did not change much for different concentrations of phosphorus-containing wastewater.

[0036] Studies have shown that the adsorption of lanthanum-loaded fly ash magnetic beads can be divided into three stages. In the first stage of 0-10 minut...

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Abstract

The invention discloses a synthesis method of a magnetic phosphorus adsorbent based on lanthanum loaded fly ash beads, belonging to the fields of resource recycling and environmental protection. The synthesis method is characterized by comprising the following steps: carrying out multi-step magnetic separation and ball milling on fly ash to obtain strong magnetic micro-beads of which the average particle size is less than or equal to 5mu m, and coating a layer of silicon oxide on the surfaces of the strong magnetic micro-beads; and then putting the silicon-coated micro-beads in a lanthanum chloride solution, dropwise adding an alkali solution until the pH value is greater than 10, and cleaning and baking to obtain lanthanum loaded fly ash beads, namely the magnetic phosphorus adsorbent. The adsorption capacity of saturated phosphorus of the magnetic phosphorus adsorbent prepared by the method can reach 18.36mg / g, and after adsorbing phosphorus, the adsorbent can realize efficient magnetic separation through a magnetic separation method; and the method disclosed by the invention can realize environment-friendly efficient preparation of the magnetic phosphorus adsorbent, is simple in synthesis process, and is suitable for industrial production after improvement.

Description

technical field [0001] The invention relates to a synthesis method of a magnetic phosphorus adsorbent, in particular to a method for preparing the magnetic phosphorus adsorbent by coating lanthanum hydrate on the surface of fly ash magnetic beads. Background technique [0002] Phosphorus pollution is one of the main sources of water eutrophication, so effective removal of phosphorus ions in sewage is an effective way to eliminate water eutrophication. Adsorption is the most common method for removing medium and low concentrations of solute phosphorus. It mainly uses the physical adsorption and chemical adsorption properties of solid adsorbents to remove phosphorus in wastewater. Among the commonly used phosphorus adsorbents, fly ash, as an industrial waste, has the advantages of wide sources, low price, and large specific surface area, and has great potential in the field of phosphorus adsorption. The invention patent with the publication number CN105293614A shows that usin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28
CPCB01J20/0207B01J20/103B01J20/28009B01J20/28019C02F1/281C02F2101/105C02F2101/30C02F2303/16
Inventor 李建军张同庆但宏兵张丽亭李想朱金波苏万福余海洋
Owner ANHUI UNIV OF SCI & TECH
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