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Method for preparing nano-hydroxyapatite

A technology of nano-hydroxyapatite and phosphate solution, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of easy decomposition, loss, instability of nanoparticles, etc., and achieve good processability , Appropriate mechanical properties, and the effect of being convenient for wide application

Inactive Publication Date: 2016-10-26
宝武集团环境资源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation of hydroxyapatite by hydrothermal synthesis and solid-state synthesis consumes a lot of energy, and it is difficult to realize the high cost in practical industrial applications.
XinYang et al. put the magnetic Fe 3 o 4 Nanoparticles were decorated on reduced graphite, and its adsorption efficiency for lead ions was studied. Although the adsorption efficiency was high, due to Fe 3 o 4 Nanoparticles are unstable under acidic conditions and are easily decomposed, which is not conducive to the adsorption of heavy metal ions under acidic conditions
Qingchun Zhao et al synthesized Al(OH) by emulsion polymerization 3 / (PAA-co-PAM) ultrafine microspheres, and adsorb heavy metal ions, but this adsorbent is not suitable for large-scale production. On the one hand, its separation process adopts a conventional separation process, which will cause a large amount of loss; on the other hand , the adsorbent is not conducive to its recycling due to its lack of magnetic responsiveness

Method used

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  • Method for preparing nano-hydroxyapatite
  • Method for preparing nano-hydroxyapatite
  • Method for preparing nano-hydroxyapatite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Dissolve 30g of slag 1# in 620mL of 1.0mol / L dilute hydrochloric acid at room temperature of 20°C, stir magnetically, and centrifuge to obtain the filtrate.

[0037] (2) Adjust the pH of the filtrate to 10 with 1.0 mol / L ammonia water, and centrifuge to obtain the filtrate.

[0038] (3) Determination of Ca 2+ The concentration is 0.02mol / L, measure 100mL of 0.12mol / L diammonium hydrogen phosphate, adjust the pH to 10 with 0.0010mol / L ammonia water, drop it into the calcium source at 40°C, stir evenly, after the addition is completed Continue to stir for 1 hour, keep the pH constant during the process, age for 12 hours, wash with deionized water until neutral, and dry to obtain nano-hydroxyapatite.

[0039] The morphology and composition of the nano-hydroxyapatite obtained in embodiment 1 are characterized, and the scanning electron microscope image (SEM) obtained, and the X-ray diffraction pattern (XRD) are respectively determined by such as figure 1 with figure...

Embodiment 2

[0042] The nano-hydroxyapatite of embodiment 1 gained is carried out the adsorption experiment of heavy metal ion:

[0043] (1) Weigh 0.5g of nano-hydroxyapatite, lead ion concentration is 800mg / L, and sewage with pH=5.5 is adsorbed at 20°C with a stirring rate of 400rpm, regularly sampled, and titrated with 1.0000mmol / L of EDTA solution The concentration of lead ions remaining in solution until adsorption equilibrium is reached.

[0044] (2) The nano-hydroxyapatite prepared in Example 2 is drawn and analyzed at different concentrations, different pHs, and different temperatures to adsorb lead ion experimental data, as shown in table 2, the lead ion adsorption curve is as follows image 3 As shown, and the SEM after the adsorption of lead ions as Figure 4 a and Figure 4 As shown in b, compared with the adsorption effect of existing adsorption materials on heavy metals in sewage, the adsorption effect of nano-hydroxyapatite prepared by the present invention on heavy metal i...

Embodiment 3

[0048] (1) Dissolve 10 g of slag 2# in 17.5 mL of 12.0 mol / L dilute hydrochloric acid at room temperature of 20°C, stir magnetically, and centrifuge to obtain the filtrate.

[0049] (2) Adjust the pH of the filtrate to 10 with 12.0 mol / L ammonia water, and centrifuge to obtain the filtrate.

[0050] (3) Determination of Ca 2+ The concentration is 1.5mol / L, measure 100mL 0.27mol / L diamine hydrogen phosphate, adjust the pH to 10 with 12mol / L ammonia water, drop it into the calcium source at 40°C, stir evenly, continue to Stir for 1 hour, keep the pH constant during the process, age for 12 hours, wash with deionized water until neutral, and dry to obtain nano-hydroxyapatite.

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Abstract

The invention provides a method for preparing nano-hydroxyapatite. The method comprises the following steps of dissolving calcium-containing slag into acid, removing impurities which are not dissolved in the acid by means of filtering, adjusting a pH value to an alkaline level, removing impurities which are not dissolved in alkali by means of filtering again, and obtaining a calcium salt solution; mixing the calcium salt solution with a phosphate solution, adjusting the pH value of the mixed solution to the alkaline level, and reacting to obtain the nano-hydroxyapatite. Compared with the prior art, the nano-hydroxyapatite prepared according to the method provided by the invention has the advantages that factory slag is taken as a raw material, the factory slag is cheap and is easily and widely obtained, the effect of turning waste into treasure is achieved, the nano-hydroxyapatite is friendly and harmless to the environment, and the technology is simple; the dispersity is excellent, the particle diameters are uniform, and the adsorption of heavy metal ions in wastewater is beneficially performed; the prepared nano-hydroxyapatite has a proper mechanical property and an excellent processing property, and the environment can be prevented from secondary pollution during the process of treating heavy metal in the wastewater, therefore the nano-hydroxyapatite is widely used in the field of water treatment.

Description

technical field [0001] The invention relates to a method for preparing nano-hydroxyapatite from slag and its application in absorbing heavy metal ions in sewage, belonging to the field of environmental protection. Background technique [0002] Environmental pollution has intensified in recent years, posing a serious threat to ecological balance, human health, and sustainable socio-economic development. Environmental purification has received extensive attention from all over the world. Among the many pollutions, due to the large demand for water, water pollution has attracted more and more attention, and has become the focus of environmental purification. Water is the source of life, and any organism and source of life are inseparable from water. Since water comes from a wide range of sources, including drinking water, domestic water, food, industrial wastewater, etc., water pollution is an important factor that endangers human health. The pollutants in water are mainly mer...

Claims

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Application Information

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IPC IPC(8): C01B25/32C02F1/28C02F1/62B82Y30/00
CPCC01B25/325C01P2002/72C01P2002/82C01P2004/03C01P2004/62C01P2004/64C02F1/286C02F2101/20
Inventor 封羽涛李文童敏
Owner 宝武集团环境资源科技有限公司
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