A kind of noble metal quantum dots and preparation method and application thereof
A technology of gold quantum dots and quantum dots, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the limitations of large-scale preparation of small-sized nanoparticles, To solve the problems of poor practicability, environmental pollution, etc., and achieve the effect of excellent catalytic performance
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Embodiment 1
[0052] The lithium vanadate LiV 3 O 8 The nano-powder is soaked in 0.001mol / L chloroauric acid solution, soaked for 1 h to perform ion exchange, and then undergoes solid-liquid separation, washing and drying at 50°C in sequence to obtain gold vanadate;
[0053] The obtained gold vanadate was calcined at a calcination temperature of 800 °C, a calcination time of 72 h, and a heating rate of 10 °C / min to obtain gold quantum dots embedded in V. 2 O 5 mixed powder;
[0054] The obtained mixed powder was washed with 1mol / L oxalic acid for 72h to remove V 2 O 5 , to obtain gold quantum dots, the size of which is less than 20 nm.
Embodiment 2
[0056] Lithium vanadate 0.01 V 3 O 8 The nano-powder is immersed in 1mol / L gold acetylacetonate solution, soaked for 72 hours for ion exchange, and then undergoes solid-liquid separation, washing and drying at 80°C in sequence to obtain gold vanadate;
[0057] The obtained gold vanadate was calcined at a calcination temperature of 200 °C, a calcination time of 1 h, and a heating rate of 0.5 °C / min to obtain gold quantum dots embedded in V. 2 O 5 mixed powder;
[0058] The obtained mixed powder was washed with 1 mol / L formic acid for 1 h to remove V 2 O 5 , to obtain gold quantum dots, the size of which is less than 20 nm.
Embodiment 3
[0060] Lithium vanadate 2 V 3 O 8 The nano-powder was soaked in 1 mol / L silver nitrate solution, soaked for 36 hours for ion exchange, and then successively underwent solid-liquid separation, washing and drying at 60 °C to obtain silver vanadate;
[0061] The obtained silver vanadate was calcined at a calcination temperature of 500 °C, a calcination time of 5 h, and a heating rate of 5 °C / min to obtain silver quantum dots embedded in V. 2 O 5 mixed powder;
[0062] The obtained mixed powder was washed with 1 mol / L acetic acid for 1 h to remove V 2 O 5 , the quantum dots of silver are obtained, and the size of the quantum dots is equal to 20 nm.
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