Preparation method of palladium-doped tin dioxide spherical nanomaterial
A technology of tin dioxide and nanomaterials, applied in the field of photocatalytic materials, can solve the problems of easy recombination of photogenerated carriers, and achieve the effects of simple preparation process, broadened response range scale, and good photocatalytic activity
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[0021] A kind of preparation method of palladium-doped tin dioxide spherical nano material of the present invention, comprises the following steps:
[0022] Step 1, after mixing stannous sulfate, citric acid and polyvinylpyrrolidone, add it to deionized water, stir to obtain a mixed solution, add palladium chloride to the mixed solution, and stir to obtain a mixed solution; stannous sulfate, citric acid, polyvinylpyrrolidone and palladium chloride in a molar ratio of 1:6:2:0.01 to 1:6:2:0.04.
[0023] SnO 2 It can be obtained by hydrolysis of tin salt, and the specific reaction is as follows:
[0024] S n 2+ +2H 2 O→S n (OH) 2 +2H+
[0025]
[0026]
[0027] S n (OH) 4 +2OH - →S n (OH) 6 2-
[0028] S n (OH) 6 2- →S n o 2 +2OH - +2H 2 o
[0029] Among them, citric acid and polyvinylpyrrolidone can play a role in regulating the morphology. Polyvinylpyrrolidone on SnO 2 play a crucial role in the formation of the structure. Polyvinylpyrrolidone has...
Embodiment 1
[0034] Step 1. After mixing 0.107g of stannous sulfate, 0.631g of citric acid and 0.1g of polyvinylpyrrolidone, add 50mL of deionized water, stir to obtain a mixed solution, add 0.0025g of palladium chloride to the mixed solution, and stir to obtain a mixed solution;
[0035] Step 2. Put the mixed solution in a polytetrafluoroethylene reactor for hydrothermal reaction. The reaction temperature is 180°C and the reaction time is 15 hours. After cooling, rinse the bottom product with deionized water and transfer it to a centrifuge tube, 5000r / min centrifuged for 1min, poured out the upper waste liquid after centrifugation, and obtained the sample in the centrifuge tube;
[0036] Step 3, adding deionized water to the centrifuge tube for washing, repeating four times; then repeating the above steps for washing four times with ethanol to obtain palladium-doped tin dioxide spherical nanomaterials.
Embodiment 2
[0038] Step 1. After mixing 0.108g of stannous sulfate, 0.635g of citric acid and 0.12g of polyvinylpyrrolidone, add 50mL of deionized water, stir to obtain a mixed solution, add 0.0051g of palladium chloride to the mixed solution, and stir to obtain a mixed solution;
[0039] Step 2. Put the mixed solution in a polytetrafluoroethylene reactor for hydrothermal reaction. The reaction temperature is 160°C and the reaction time is 18 hours. After cooling, the bottom product of the reactor is centrifuged to obtain a sample;
[0040] Step 3, washing the sample with deionized water and ethanol in sequence to obtain palladium-doped tin dioxide spherical nanomaterials. The SEM picture of the product is shown in figure 1 , high magnification SEM image see figure 2 , EDS diagram see image 3 . Depend on figure 1 figure 2 It can be seen that the prepared product is composed of a large number of hollow spherical substances, and the SnO prepared in Example 2 2 The diameter of the s...
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