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A technology of hydroxyapatite and nanosheets, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of high synthesis temperature, influence on purity, complex process, etc., and achieve reduced production costs, easy production process, require simple effects
Inactive Publication Date: 2014-08-20
HUAIHAI INST OF TECH +2
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However, during the synthesis process, templates or surfactants need to be added. These additives can easily pollute the final product and affect the purity of hydroxyapatite.
[0005] In summary, the preparation of hydroxyapatite is relatively limited t...
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Embodiment 1
[0023] Embodiment 1, a preparation method of hydroxyapatite nanosheets, the steps are as follows: shell powder or egg shells are used as calcium source, ammonium phosphate is used as phosphorus source, and water is used as solvent. The reaction is made.
Embodiment 2
[0024] Embodiment 2, a preparation method of hydroxyapatite nanosheets, the specific steps are as follows:
[0025] (1) Weigh the calcium source and chemically pure ammonium phosphate according to the mass ratio of 2:1, then add distilled water with a volume-to-mass ratio of 500mL: 2g of shell powder and mix them, mix them evenly with a magnetic stirrer, and pour them into the reaction vessel , and then placed in a constant temperature water bath at 30°C for 30 h;
[0026] (2) After the reaction, centrifuge to obtain a white precipitate, wash with distilled water and absolute ethanol to remove impurities, and finally put it into a constant temperature drying oven at 55 °C to dry to obtain hydroxyapatite nanosheets.
Embodiment 3
[0027] Embodiment 3, a kind of preparation method of hydroxyapatite nanosheet, its specific steps are as follows:
[0028] (1) Weigh the calcium source and chemically pure ammonium phosphate according to the mass ratio of 4:1, then add distilled water with a volume-to-mass ratio of 1000mL: 4g of shell powder and mix them, mix them evenly with a magnetic stirrer, and pour them into the reaction vessel , and then placed in a constant temperature water bath at 70 °C for 18 h;
[0029] (2) After the reaction, centrifuge to obtain a white precipitate, wash with distilled water and absolute ethanol to remove impurities, and finally put it into a constant temperature drying oven at 65 °C to dry to obtain hydroxyapatite nanosheets.
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Abstract
The invention relates to a preparation method of hydroxyapatite nanosheets, which comprises the following step: by using shell powder or egg shells as a calcium source, ammonium phosphate as a phosphorus source and water as a solvent, reacting at 30-70 DEG C to obtain the hydroxyapatite nanosheets. According to the method, the reaction occurs at lower temperature, the prepared shell calcium carbonate crystal grains have favorable crystallinity and obvious oriented preferential growth shape, are sheet-shaped, and have low solubility in the water solution. In the reaction process, calcium carbonate crystal grain dissolution, hydroxyapatite recrystallization and hydroxyapatite grain growth are performed, the calcium carbonate sheet-like crystal grains gradually grow into the hydroxyapatite nanosheets. The method has simple requirements for reactors, and can perform production only by using a glass container, a stirrer, a thermostatic water bath box and other low-temperature reactors; and the production process is easy to operate and does not need any high-temperature high-pressure apparatus, thereby effectively lowering the production cost of hydroxyapatite.
Description
technical field [0001] The invention belongs to the preparation technology of hydroxyapatite, in particular to a method for preparing hydroxyapatite nanosheets on a large scale at low temperature. Background technique [0002] Hydroxyapatite (HAP) is a new type of adsorption material with strong adsorption. The structural channel in the crystal structure endows it with good ion exchange performance, which can adsorb and recycle various heavy metals and organic polymers in industrial wastewater. Pollutants have good coordination with the environment and are not easy to cause secondary pollution. For example containing Zn 2+ After the electroplating wastewater was adsorbed by nano-hydroxyapatite, the Zn in the wastewater 2+ The content is lower than the national first-level emission standard. And the adsorbent adsorbed Zn 2+ After elution with HCl, Ca(CH 3 COO) 2 It can be reused many times after regeneration (Luo Daocheng et al., Material Protection, 2009, 42, 73). It...
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