Preparation method of phosphate ion-based particles
A phosphate ion and particle technology, which is applied in the field of preparation of calcium phosphate and magnesium phosphate, can solve the problem that the morphology and structure of calcium phosphate particles and magnesium phosphate particles are difficult to control
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example 1
[0102] This example illustrates method M1. According to method 1, calcium phosphate hollow spherical particles and / or magnesium phosphate particles are synthesized by calcium / phosphate ions and magnesium / calcium in different molar ratios, specifically: the phosphate solution containing phosphate ions is directly mixed with magnesium ions and calcium The cation solution of ions is mixed to form a clear aqueous solution, and the ionic ratio in the clear aqueous solution obtained by mixing different concentrations of phosphate solution and cationic solution is also different; then the clear aqueous solution is placed in an oven at 100°C for hydrothermal reaction for 6 hours; The pH of the clear aqueous solution was adjusted to 7 prior to hydrothermal treatment.
[0103] Table 1 shows the molar ratios of calcium / phosphate ions and magnesium / calcium in the clarified aqueous solutions and the morphology and composition of the corresponding precipitates.
[0104]
[0105] Table 1...
example 2
[0127] This example illustrates M2. Specifically: prepare different concentrations of disodium phosphate solutions and different concentrations of calcium chloride and magnesium chloride solutions according to the ratio in Table 3, and then heat them to 100° C. respectively, and then mix them.
[0128] Table 3 Morphology of particles obtained by reacting calcium ions, magnesium ions and phosphate ions at different concentrations.
[0129]
[0130] The precipitates are all hollow spherical nanoparticles with a size ranging from 50nm to 200nm, wherein, Figure 19 , Figure 20 , Figure 21 with Figure 22 The morphology of the precipitates synthesized by M2-1, M2-2, M2-3 and M2-4 methods are shown respectively. Figure 23 The XRD pattern corresponding to M2-2 shows that it is amorphous and its composition is calcium phosphate substituted with magnesium. Amorphous spherical particles have a shorter degradation time compared to crystalline calcium phosphate particles.
example 3
[0132] This example is described in terms of M1-LW. Specifically: 1) the lake water is sampled from Lake Mälaren, and the molar ratio of magnesium / calcium measured by inductively coupled plasma atomic emission spectrometry is 0.35; 2) disodium phosphate is then dissolved in undiluted lake water to form a 1.4 mM clear aqueous solution of phosphate ions; 3) Adjust the clear aqueous solution to pH 7, then heat it in an oven to 100°C and keep it warm for 3 hours. This process yields calcium phosphate nanoparticles with a particle size of about 100-250 nm, see Figure 24 . Its XRD spectrum shows that it is amorphous, see Figure 26 Curve a in.
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