a kind of sio 2 Preparation method and application of @zno core-shell structure multi-legged sphere nanocomposite
A technology of nanocomposite material and core-shell structure is applied in the field of preparation of SiO2@ZnO core-shell structure multipodal nanocomposite materials, which can solve the problems of difficult preparation and separation of composite materials, and improve the photocatalytic activity and dispersibility. Good results with mild preparation conditions
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Embodiment 1
[0036] (1) First, 0.01g SiO 2 The pellets were added to the 0.5g / L ZnO seed solution, shaken for 24 hours, and filtered to obtain SiO with ZnO seeds. 2 small ball;
[0037] (2) get 20mL 0.625mmol / L hexamethylenetetramine (HMT) and 20mL 0.625mmol / L zinc nitrate preparation mixed aqueous solution, the above-mentioned SiO with ZnO seed crystal 2 The pellets are added to the above-mentioned mixed aqueous solution;
[0038] (3) Put the above mixed solution on an electric furnace and heat it so that the temperature of the mixed solution is 70°C, put the probe of an ultrasonic pulverizer into the mixed solution, and after ultrasonic pulverization for 4 hours, stand for sedimentation separation, washing and drying to obtain SiO 2 @ZnO core-shell structured multipodal microsphere nanocomposites.
[0039] The products were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM).
[0040] refer to figure 1 , respectively give the SiO with ZnO seeds prepared in Ex...
Embodiment 2
[0044] The difference between this example and Example 1 is that the concentration of the ZnO seed crystal is 0.2 g / L. The obtained product is basically the same as that of Example 1, but because the solubility of the seed crystal is relatively small, the SiO 2 The ZnO nanorods on the ball are not dense, and the scanning electron microscope image is as follows image 3 shown. image 3 In (a) is the SEM image of the prepared sample. It can be seen from the figure that there is SiO in the sample at the same time. 2 @ZnO core-shell particles and ZnO nanorods are difficult to separate, so a large number of ZnO nanorods can be seen in the figure at the same time. (b) is a SiO in the sample 2 SEM image of @ZnO core-shell particles, from which we can see obvious ZnO seed particles, SiO 2 The size of the ZnO nanorods on the surface of the pellets is not uniform.
Embodiment 3
[0046] The difference between this example and Example 1 is that the concentration of the ZnO seed crystal is 1.0 g / L. The obtained product is basically consistent with embodiment 1, and its scanning electron microscope diagram is as follows Figure 4 shown. where (a) is the SEM image of the as-prepared sample, and (b) is a single SiO 2 SEM image of the @ZnO core-shell particles. From (a), it can be seen that the prepared samples are composed of uniform SiO 2 @ZnO core-shell structure particles, basically no ZnO nanorods were found; it can be seen from (b) that SiO 2 The surface is completely covered by ZnO nanorods, forming a complete SiO 2 @ZnO core-shell structure.
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