Photocatalyst with core-shell structure and preparation method of photocatalyst

[0032] Example 1

[0033] The photocatalyst of this embodiment has a core-shell structure, wherein the core is titanium dioxide nanoparticles, and the shell is LaPO coated on the surface of the titanium dioxide nanoparticles. 4 ; Titanium dioxide nanoparticles are cup-shaped structure, and anatase crystal phase, the particle size of titanium dioxide nanoparticles is 110nm.

[0034] The preparation method of the photocatalyst in this embodiment includes the following steps:

[0035] (1) Preparation of LaPO 4 ;

[0036] Dissolve phosphorus source—sodium phosphate in solvent A—ethylene glycol to prepare a phosphorus source solution with a concentration of 1.2 mol / L; dissolve lanthanum source—lanthanum nitrate in solvent B—deionized water to obtain a concentration of 0.5mol / L lanthanum source solution; add phosphorus source solution dropwise to the lanthanum source solution while stirring, continue stirring for 90 minutes, adjust the pH of the mixed solution to 6, react at 90°C for 24 ho

[0044] Example 2

[0045] The structure of the photocatalyst of this embodiment is different from that of Embodiment 1 in that the particle size of the titanium dioxide nanoparticles is 120 nm.

[0046] The preparation method of the photocatalyst in this embodiment includes the following steps:

[0047] (1) Preparation of LaPO 4 ;

[0048] Dissolve phosphorus source—ammonium phosphate in solvent A—deionized water to prepare a phosphorus source solution with a concentration of 2.0 mol / L; dissolve lanthanum source—lanthanum chloride in solvent B—ethanol to obtain a concentration of 0.8 mol / L lanthanum source solution; add phosphorus source solution dropwise to the lanthanum source solution while stirring, continue stirring for 100 minutes, adjust the pH of the mixed solution to 8, react at 180°C for 18 hours, and wash the resulting precipitate with water and ethanol by centrifugation , To ion concentration 4 .

[0049] (2) Preparation of LaPO 4 C;

[0050] The LaPO prepared in step (1)

[0056] Example 3

[0057] The structure of the photocatalyst of this embodiment is different from that of Embodiment 1 in that the particle size of the titanium dioxide nanoparticles is 130 nm.

[0058] The preparation method of the photocatalyst in this embodiment includes the following steps:

[0059] (1) Preparation of LaPO 4 ;

[0060] The phosphorus source—ammonium hydrogen phosphate was dissolved in solvent A—ethanol to prepare a phosphorus source solution with a concentration of 2.8 mol / L; the lanthanum source—lanthanum acetate was dissolved in solvent B—ethylene glycol to obtain a concentration of 1.1mol / L lanthanum source solution; add phosphorus source solution dropwise to the lanthanum source solution while stirring, continue stirring for 120 minutes, adjust the pH of the mixed solution to 10, react at 240°C for 12 hours, and centrifuge the resulting precipitate with water and ethanol Washing to ion concentration 4 .

[0061] (2) Preparation of LaPO 4 C;

[0062] The LaPO p