Precious metal nanoparticle composite material and preparation method thereof
A technology of composite materials and nanoparticles, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the problems of easy aggregation of nanoparticles, low stability, and separation of catalysts , The recycling process is cumbersome, time-consuming and labor-intensive, etc.
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[0030] A kind of preparation method of dopamine / multi-acid burden ferric oxide in-situ synthesis precious metal nano particle composite material, comprises the following steps:
[0031] 1) Fe 3 o4 (0.10 g) magnetic carrier was dispersed in Tris buffer (pH=8.5; 40 mL), and ultrasonicated for 30 minutes to obtain a uniformly dispersed suspension. Dopamine (80 mg) and polyoxometalates (K 6 [SiW 11 V IV o 40 ]·7H 2 O; 0.160 mmol), continuously magnetically stirred at 20°C for 4 hours, the product was separated from the solution by magnetic separation, washed three times with deionized water, and vacuum-dried at 50°C for 12 hours to obtain Fe 3 o 4 @PDA / SiW 11 V complex (as figure 2 shown).
[0032] 2) Fe 3 o 4 @PDA / SiW 11 The V (0.1g) complex was dispersed into a mixed solution containing isopropanol (5 mL) and water (50 mL), and stirred for 10 min (1000 r / min) to disperse the complex to obtain a uniform suspension. The above suspension was irradiated with a 300W mer...
Embodiment 1
[0041] 1) Fe 3 o 4 (0.10 g) magnetic carrier was dispersed in Tris buffer (pH=8.5; 40 mL), and ultrasonicated for 30 minutes to obtain a uniformly dispersed suspension. Dopamine (80 mg) and polyoxometalates (K 6 [SiW 11 V IV o 40 ]·7H 2 O; 0.160 mmol), continuously magnetically stirred at 20°C for 4 hours, the product was separated from the solution by magnetic separation, washed three times with deionized water, and vacuum-dried at 50°C for 12 hours to obtain Fe 3 o 4 @PDA / SiW 11 V complex.
[0042] 2) Fe 3 o 4 @PDA / SiW 11 The V (0.1g) complex was dispersed into a mixed solution containing isopropanol (5 mL) and water (50 mL), and stirred for 10 min (1000 r / min) to disperse the complex to obtain a uniform suspension. The above suspension was irradiated with a 300W mercury lamp for 1 hour to make the SiW deposited on the surface of the composite 11 V is restored. Turn off the light, and dissolve 1mL of 0.25mol·L under vigorous stirring -1 AgNO 3 The aqueous sol...
Embodiment 2
[0045] 1) Fe 3 o 4 (0.10 g) magnetic carrier was dispersed in Tris buffer (pH=8.5; 40 mL), and ultrasonicated for 30 minutes to obtain a uniformly dispersed suspension. Dopamine (80 mg) and polyoxometalates (K 6 [SiW 11 V IV o 40 ]·7H 2 O; 0.160 mmol), continuously magnetically stirred at 20°C for 4 hours, the product was separated from the solution by magnetic separation, washed three times with deionized water, and vacuum-dried at 50°C for 12 hours to obtain Fe 3 o 4 @PDA / SiW 11 V complex.
[0046] 2) Fe 3 o 4 @PDA / SiW 11 The V (0.1g) complex was dispersed into a mixed solution containing isopropanol (5 mL) and water (50 mL), and stirred for 10 min (1000 r / min) to disperse the complex to obtain a uniform suspension. The above suspension was irradiated with a 300W mercury lamp for 1 hour to make the SiW deposited on the surface of the composite 11 V is restored. Turn off the light, and dissolve 1.5 mL of 0.25 mol·L under vigorous stirring -1 AgNO 3 The aqueous...
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