Polyoxometalate and its composite, preparation method and application
A technology of polyoxometalates and complexes, applied in chemical instruments and methods, water treatment of special compounds, water pollutants, etc. Problems such as low utilization of light energy
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Embodiment 1
[0061] Polyoxometalate compounds (NH 4 ) 3 PW 11 o 39 Preparation of Sn:
[0062] Step 1. Weigh ammonium phosphotungstate and stannous chloride according to the mass ratio of 1:2, add them into 20mL distilled water respectively, and dissolve them ultrasonically to obtain stannous chloride solution and ammonium phosphotungstate dispersion;
[0063]Step 2: Pour the stannous chloride aqueous solution into the ammonium phosphotungstate dispersion liquid and ultrasonically mix to obtain a mixed dispersion liquid;
[0064] Step 3: Adjust the pH of the mixed dispersion to 1.0, place the adjusted mixed solution in a water bath, heat in a water bath at 60°C for 3 hours, cool, filter with suction, and dry at 40°C to obtain polyoxometalate compound.
Embodiment 2-5
[0066] In embodiment 2-5 polyoxometalate compound (NH 4 ) 3 PW 11 o 39 The preparation method of Sn is the same as that of Example 1, and the specific reaction conditions are shown in Table 1.
[0067] Table 1 embodiment 2-5 reaction conditions
[0068] Example (NH 4 ) 3 PW 12 o 40 and SnCl 2 mass ratio
pH 2 1:3 1.5 3 1:1 2.0 4 1:2 2.5 5 1:0.5 3.0
[0069] Taking Example 4 as an example, perform characterization, and the characterization results are as follows:
[0070] This embodiment is through scanning electron microscope SEM ( Figure 1a and Figure 1b ) It can be seen that after doping the transition metal tin, the particles become smaller, the particle distribution is uniform, and it is relatively fluffy. This fluffy structure is conducive to the contact between pollutants and the catalyst and improves the photocatalytic activity of the catalyst. Figure 1c and Figure 1d for (NH 4)3 PW 12 o 40 and (NH 4 ) ...
Embodiment 6
[0094] Complexes of polyoxometalates (NH 4 ) 3 PW 11 o 39 Sn / TiO 2 Preparation of:
[0095] Step a, weigh the polyoxometalate and titanium dioxide nanoparticles prepared in Example 4 respectively according to the mass ratio of 1:2, add them to 30mL of absolute ethanol, and ultrasonically dissolve them to form the polyoxometalate dispersion and titanium dioxide dispersion ;
[0096] Step b, adding the titanium dioxide dispersion into the polyoxometalate dispersion and ultrasonically mixing, mixing evenly, adjusting the pH to 1.0, transferring to a water bath, heating in a water bath at 60°C for 3 hours, cooling, and washing with suction, Dry at 40°C, and then grind to get powdered (NH 4 ) 3 PW 11 o 39 Sn / TiO 2 catalyst of light.
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