Strontium modified hydroxyapatite as well as synthesis and application methods thereof

A technology of hydroxyapatite and synthesis method, which is applied in the direction of phosphorus compounds, chemical instruments and methods, and other chemical processes, can solve the problems of inability to achieve removal effect and limited adsorption capacity, achieve good adsorption effect, low cost, and widely used The effect of application range

Pending Publication Date: 2022-03-25
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although hydroxyapatite adsorbent can remove pollutants in water to a certain exten

Method used

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  • Strontium modified hydroxyapatite as well as synthesis and application methods thereof
  • Strontium modified hydroxyapatite as well as synthesis and application methods thereof
  • Strontium modified hydroxyapatite as well as synthesis and application methods thereof

Examples

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preparation example Construction

[0027] According to the technical scheme of the present invention, some specific synthetic methods of strontium-modified hydroxyapatite include:

[0028] (1) Mix a total of 10mmol of calcium chloride and strontium chloride according to the ratio of n(Ca):n(Sr)=(93~99):(1~7), add 100ml of deionized water and dissolve it to no color transparent;

[0029] (2) Add 6 mmol of sodium dihydrogen phosphate into 100 ml of deionized water and dissolve it to colorless and transparent, then mix the solution obtained in (1) with it;

[0030] (3) Adjust the pH of the mixed solution obtained in step (2) to 6.0-7.0 with sodium hydroxide, and stir at a constant speed, and then age for 6-18h;

[0031] (4) The aged material in step (3) is centrifugally washed with deionized water, dried in an oven, and ground to obtain strontium-modified hydroxyapatite.

Embodiment 1

[0033] Dissolve a total of 10mmol of calcium chloride and strontium chloride in different proportions in 100ml of deionized water, and also dissolve 6mmol of sodium dihydrogen phosphate in 100ml of deionized water, mix the two solutions, and then adjust the pH to 6 with sodium hydroxide , the pH-adjusted solution was stirred at room temperature for 1 h, then aged at room temperature for 12 h, then centrifuged, washed and dried, dried at 60°C, and ground into fine powder to obtain different samples.

[0034] In the obtained sample, when n(Ca):n(Sr)=1:0, it is hydroxyapatite (referred to as HAP), and when n(Ca):n(Sr)=93:7, it is the present invention Strontium-modified hydroxyapatite (referred to as Sr-HAP), the two samples were subjected to X-ray crystal diffraction analysis, and their structures are shown in the attached figure 1 shown. Depend on figure 1 It can be seen that the HAP sample has typical hydroxyapatite crystal diffraction peaks, and after strontium doped into h...

Embodiment 2

[0036] Prepare different concentrations of sodium fluoride solutions, respectively 5mg / L, 10mg / L, 15mg / L, 20mg / L, 25mg / L, 30mg / L, 35mg / L, 40mg / L, 45mg / L, 50mg / L , and adjust its pH to be 5, at room temperature, select a 50ml centrifuge tube, get 40ml sodium fluoride solution, add HAP or Sr-HAP obtained in Example 1 according to a feeding ratio of 1g / L, and mix well at room temperature Rotate and stir at 70 rpm on the machine for 12 hours. After the reaction, filter the supernatant with a syringe, and use colorimetry to measure the remaining fluoride ions in the solution after the reaction. figure 2 The comparison of the isotherms for the adsorption of fluoride ions shown shows that the adsorption of fluoride ions by Sr-HAP is obviously better than that of HAP. The equilibrium adsorption capacity of HAP for fluoride ions was 12.19 mg / g, and the equilibrium adsorption capacity of Sr-HAP for fluoride ions was 20.75 mg / g. Compared with HAP, the adsorption efficiency of Sr-HAP fo...

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Abstract

The invention discloses strontium modified hydroxyapatite and a synthesis and application method thereof.The synthesis method comprises the steps that a first mixed solution containing calcium ions and strontium ions and a sodium dihydrogen phosphate aqueous solution are mixed to obtain a second mixed solution, the pH of the second mixed solution is adjusted to 6.0-7.0 for a reaction, then aging is conducted for 6-18 h, and the strontium modified hydroxyapatite is obtained. The strontium modified hydroxyapatite is obtained. The synthesis method disclosed by the invention is simple in process, low in cost and environment-friendly, and the obtained product has efficient fluorine adsorption capacity.

Description

technical field [0001] The invention relates to the technical field of fluoride ion adsorbents. Background technique [0002] Hydroxyapatite (HAP), chemical formula (Ca 10 (PO 4 ) 6 (OH) 2 ), is the main inorganic component of human and animal bones, has good biocompatibility, and is often used as a dental material. At the same time, HAP is also a good water treatment material, its OH - It can be replaced by fluoride, chloride and carbonate ions to generate fluoroapatite or chloroapatite, so as to achieve the purpose of removing free fluoride ions in water. Although hydroxyapatite adsorbent can remove pollutants in water to a certain extent, its adsorption capacity is very limited and cannot achieve a good removal effect. Contents of the invention [0003] The object of the present invention is to propose a strontium-modified hydroxyapatite and its synthesis and application method. The strontium-modified hydroxyapatite can efficiently adsorb and remove fluoride ions ...

Claims

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Application Information

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IPC IPC(8): C01B25/45B01J20/04B01J20/30C02F1/28C02F101/14C02F101/16
CPCC01B25/45B01J20/048C02F1/281C02F2101/14C02F2101/16
Inventor 王雅博刘雨秋张永奎
Owner SICHUAN UNIV
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