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Preparation method of a composite magnetic hydroxyapatite macrosphere adsorption material

A technology of hydroxyapatite and composite magnetism, which is applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc. Problems such as overcoating and reduction of adsorption efficiency, etc., to achieve the effect of convenient magnetic recovery in small batches, easy promotion, and high adsorption capacity

Inactive Publication Date: 2019-07-12
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnetic hydroxyapatite prepared by this method often has no coating and uneven coating, and it is difficult to realize the preparation of high-performance magnetic hydroxyapatite in the true sense, which will further reduce the adsorption efficiency.

Method used

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  • Preparation method of a composite magnetic hydroxyapatite macrosphere adsorption material
  • Preparation method of a composite magnetic hydroxyapatite macrosphere adsorption material
  • Preparation method of a composite magnetic hydroxyapatite macrosphere adsorption material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Composite magnetic hydroxyapatite agarose macrosphere.

[0030] In this example, monodisperse magnetic hydroxyapatite is used as the adsorption core, and inert media such as agarose are used as composite coatings to prepare composite magnetic hydroxyapatite-agarose spheres.

[0031] (1) Preparation of magnetic ferric oxide

[0032] Weigh 2.7g of ferric chloride hexahydrate and place it in a beaker, add 80mL of ethylene glycol, stir and dissolve the ferric chloride hexahydrate until completely dissolved, and obtain a clear solution. Add 7.2 g of sodium acetate trihydrate and 2 g of polyethylene glycol 2000 to the clear solution and stir until completely dissolved. The solution was transferred to a reactor and reacted at 200°C for 8h. Magnetic iron oxide particles were obtained by washing with ethanol and distilled water several times, dried in vacuum and stored for later use.

[0033] (2) Preparation of monodisperse magnetic hydroxyapatite microspheres: Fe ...

Embodiment 2

[0039] Embodiment 2: Determination of adsorption thermodynamics

[0040] 1. Preparation of Composite Magnetic Hydroxyapatite Agarose Spheroids

[0041] The preparation method is the same as the steps in Example 1.

[0042] 2. Product testing

[0043] Evaluation of adsorption thermodynamics: Co 2+ , Pb 2+ Two kinds of heavy metal ions were used to investigate the adsorption thermodynamic behavior of this adsorption material. Take 20ml and the concentration is 10-200mg L -1 Cobalt ion solution, and the concentration is 50-2000mg L -1 Add 20 mg of composite magnetic hydroxyapatite agarose large ball adsorption material to a 50 mL centrifuge tube, shake at room temperature for 10 h, take the supernatant to measure the concentration of metal ions, and finally calculate the adsorption amount of metal ions.

[0044] Such as Figure 4 As shown, by fitting the Langmuir model and the Freundlich model to the adsorption experimental data of the two metal ions, it can be seen that t...

Embodiment 3

[0045] Embodiment 3 adsorption kinetics is measured

[0046] 1. Preparation of Composite Magnetic Hydroxyapatite Agarose Spheroids

[0047] The preparation method is the same as the steps in Example 1.

[0048] 2. Product testing

[0049] Evaluation of adsorption kinetics: Co 2+ , Pb 2+ Two kinds of heavy metal ions were used to investigate the adsorption kinetics of this adsorbent material. Take 20ml of cobalt ion and lead ion solution in a 50mL centrifuge tube, add 20mg of composite magnetic hydroxyapatite agarose large ball adsorption material, shake at room temperature for 0-10h, take the supernatant to measure the metal ion concentration, and finally calculate Adsorption of metal ions.

[0050] Such as Figure 5 As shown, with the increase of time, the effect of this kind of large ball on Pb 2+ 、Co 2+ The adsorption amount increases rapidly at first, then tends to be flat, and reaches equilibrium after the adsorption time reaches 4h. By fitting the first-order ki...

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Abstract

The invention relates to preparation and application of a composite magnetic hydroxyapatite macro-sphere adsorbing material and belongs to the fields of preparation of composite adsorbing materials and water treatment application. The preparation method comprises the following steps: modifying a carboxy group on the surface of prepared magnetic ferroferric oxide, and introducing calcium ion into the reaction system, so that the calcium ion can be adsorbed by carboxylate radical ion on the magnetic sphere surface, and finally monodisperse magnetic ferroferric oxide is formed; coating a porous inert medium on the magnetic sphere surface, and successfully preparing the composite magnetic hydroxyapatite macro-sphere adsorbing material. The material has the characteristics of large macro-sphere size and excellent magnetic response and can be simultaneously applied to large-scale industrial water pollution treatment and small-scale lab application; and moreover, nanoparticles coated in macro-spheres can effectively enlarge the specific surface area for adsorption, and the adsorption capacity is improved. The composite magnetic hydroxyapatite macro-sphere adsorbing material prepared by the method disclosed by the invention is simple in preparation method and high in reproducibility, and the prepared material has higher adsorption capacity on metal ions in the water body.

Description

technical field [0001] The invention relates to a method for preparing adsorption macrospheres, in particular to a method for preparing a composite magnetic hydroxyapatite macrosphere adsorption material. Background technique [0002] With the development of the economy, heavy metal pollution has become one of the major problems that human beings need to solve. At present, the main methods of water treatment are: chemical coprecipitation, ion exchange, electrochemical treatment, biochemical treatment, adsorption method, etc. Among them, adsorption method is the simplest, most efficient and flexible method for heavy metal water pollution treatment. At present, the commonly used adsorbents mainly include activated carbon, zeolite, clay, biomass and polymer materials. These materials often have the disadvantages of low adsorption capacity, difficult separation, and high cost. Therefore, the development of adsorbents with low cost, easy separation, and good adsorption effect to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/22B01J20/24B01J20/28009C02F1/285C02F2101/20
Inventor 杜开峰张琦杨敏
Owner SICHUAN UNIV