Organic silicon dioxide loaded PMoW polyacid photocatalytic material as well as preparation method and application thereof
A technology of organic silicon dioxide and photocatalytic materials, applied in the direction of organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of heteropolyacid loss and shedding , Heteropoly acid and silicon dioxide are not firmly combined to achieve the effect of improving dispersion, strong electronegativity, and fast reversible redox ability
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Embodiment 1
[0025] A kind of preparation method of silicon dioxide loaded PMoW multi-acid photocatalytic material, comprises the following steps:
[0026] Step 1) Preparation of silica microspheres: Dissolve tetraethoxysilane (CTAB, 0.3g) and hexadecyltrimethylammonium bromide (TEOS, 1ml) in ethanol aqueous solution (ethanol 103.8mL, distilled water 82.8 mL)), add ammonia water dropwise to adjust to pH = 8, stir at 50°C for 48 hours, cool the mixture to room temperature, centrifuge the slurry, and wash with distilled water for 3 times; the obtained product is freeze-dried and placed in a quartz crucible , Calcined at 773 K for 6 hours to prepare silica microspheres.
[0027] Step 2) Organicization of silica microspheres: ultrasonically disperse the silica microspheres prepared in step 1) in N,N-dimethylformamide solution, add a certain amount of silane coupling agent KH-560, Add 1 mol / L sodium hydroxide solution to adjust pH=9, stir at room temperature for 2 hours, transfer the resulting...
Embodiment 2
[0030] A kind of preparation method of organic silicon dioxide loaded PMoW multi-acid photocatalytic material, concrete steps are as follows:
[0031] Step 1) Preparation of silica microspheres: Dissolve tetraethoxysilane (CTAB, 0.3g) and hexadecyltrimethylammonium bromide (TEOS, 1ml) in ethanol aqueous solution (ethanol 103.8mL, distilled water 82.8 mL)), add ammonia water dropwise to adjust to pH = 8, stir at 50°C for 48 hours, cool the mixture to room temperature, centrifuge the slurry, and wash with distilled water for 3 times; the obtained product is freeze-dried and placed in a quartz crucible , Calcined at 773 K for 6 hours to prepare silica microspheres.
[0032]Step 2) Organicization of silica microspheres: ultrasonically disperse the silica microspheres prepared in step 1) in N,N-dimethylformamide solution, add a certain amount of silane coupling agent KH-560, Add 1 mol / L sodium hydroxide solution to adjust pH=9, stir at room temperature for 2 hours, transfer the re...
example 3
[0037] The silica-supported PMoW multi-acid composite material prepared in Example 2 is used as a photocatalyst in a photocatalytic sewage treatment device (simulated sewage in the laboratory), and the common refractory erythromycin and highly toxic algal toxin As the degradation object, the degradation efficiency of typical highly toxic and refractory pollutants in actual industrial wastewater was investigated. Such as Figure 4 Shown is the degradation rate figure that the silicon dioxide loaded PMoW polyacid photocatalytic material that embodiment 2 makes is used for degrading erythromycin and algae toxin, by Figure 4 It can be seen that the removal rate of erythromycin reached more than 90% when the organic silicon dioxide loaded PMoW polyacid photocatalytic material 50min made in embodiment 2 reached more than 90%, and the removal rate of algal toxins reached more than 90% during 60min. The photocatalytic degradation of erythromycin and algal toxins by the organic silic...
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