Three-dimensional porous graphite-coated nano zero-valent copper composite material and preparation method
A graphene-wrapped, nano-zero-valent technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of zero-valent material agglomeration, dissolution and deactivation, etc. Activity delay and prevention, high efficiency of the preparation process
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Embodiment 1
[0029] First prepare graphene oxide (GO), the steps are as follows: add 106mL of concentrated sulfuric acid and 1.0g of expandable graphite into the reaction vessel, stir in an ice-water bath for 30min; slowly add 5g of potassium permanganate, and keep the system temperature not exceeding 15 ℃; after the reaction is completed, withdraw from the ice-water bath, and stir at a constant temperature of 35±1℃ for 3 days; then add ultrapure water three times, add 40mL for the first time, stir at 60±1℃ for 60min, and add 40mL for the second time , keep at 90±1°C for 30min, add 40mL ultrapure water directly for the third time; finally add 10mL 30wt% H 2 o 2 , centrifuged at 12000r / min for 30min while hot, after removing the supernatant, centrifuged and washed several times with hydrochloric acid and ultrapure water with a volume ratio of 1:10, and freeze-dried for later use, wherein the concentration of hydrochloric acid was 36-38%. (In other embodiments, conventional methods can also...
Embodiment 2
[0035] The preparation process of graphene oxide (GO) is the same as in Example 1. KBH 4 Under the condition that the stirring time of the reduced graphene is 1 h, the preparation steps of the three-dimensional porous graphene-wrapped nano-zero-valent copper composite material are as follows: first, 0.8 g of freeze-dried graphene oxide is ultrasonically dispersed in 100 ml of ultrapure water for 2 h; with 3g KBH 4 Mix, stir and react at room temperature for 1 h, pass argon to make the reaction vessel in an oxygen-free state; then drop 0.04 mol / L CuSO into the reaction vessel at a rate of 1 ml / min 4 ·5H 2 O solution 50ml, during the reaction process, argon gas was blown in to keep the reaction in the anaerobic state and prevent the agglomeration of nanoparticles, and kept stirring to keep the solution in a uniformly mixed state. After reacting for 1h, the synthesized composite material was naturally precipitated, discarded Supernatant liquid; adding the same amount of ultrap...
Embodiment 3
[0038] The preparation process of graphene oxide (GO) is the same as in Example 1. KBH 4 Under the condition that the stirring time of the reduced graphene is 25h, the preparation steps of the three-dimensional porous graphene-wrapped nano-zero-valent copper composite material are as follows: first, 0.8g of freeze-dried graphene oxide is ultrasonically dispersed in 100ml of ultrapure water for 2h; with 6.5g KBH 4 Mix, stir and react at room temperature for 25 hours, pass argon to make the reaction vessel in an oxygen-free state; then drop 0.04mol / L CuSO into the reaction vessel at a rate of 1ml / min 4 ·5H 2 O solution 50ml, during the reaction process, argon gas was blown in to keep the reaction in the anaerobic state and prevent the agglomeration of nanoparticles, and kept stirring to keep the solution in a uniformly mixed state. After reacting for 1h, the synthesized composite material was naturally precipitated, discarded Supernatant liquid; add the same amount of ultrapu...
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