Novel nano-composite visible light catalyst and preparation method thereof
A nanocomposite, visible light technology, applied in the field of photocatalytic materials, can solve the problems of uncontrollable tin tungsten oxide particle size, decreased photocatalytic activity, and decreased specific surface area, so as to improve catalyst activity, reduce recombination rate, and promote separation. Effect
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[0024] Example 1
[0025] Weigh 1 g of graphene oxide prepared by the improved Hummer method, add 5 g of NaOH, grind it uniformly, and then place it in a tube furnace and heat it at 760 °C for 1 h under a nitrogen atmosphere with a programmed heating rate of 5 °C / min to obtain Porous graphene; the specific surface area of porous graphene is 350 m 2 / g; its conductivity is 60 S m -1 ; The weight loss at 900 °C is 4 wt%.
[0026] 22.6 mg of SnCl 2 ·2H 2 O and 33 mg of Na 2 WO 4 ·2H 2 O solid (weighed according to the substance ratio of 1:1) was successively added to 50 mL of deionized water, then 1 mg of anhydrous sodium acetate and 1 mg of ethylene glycol were added, and the precursor was obtained by magnetic stirring for 30 min.
[0027] The precursor was transferred into a reaction tank, placed in a stainless steel reaction kettle, added with 1 g of porous graphene, sealed and placed in an oven to react at 170 °C for 6 h. After the reaction, it was cooled to room ...
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[0032] Example 2
[0033] Weigh 1 g of graphene oxide prepared by the improved Hummer method, add 4 g of KOH, grind it uniformly, and then place it in a tube furnace and heat it at 760 °C for 1 h under a nitrogen protective atmosphere with a programmed heating rate of 5 °C / min to obtain Porous graphene; the specific surface area of porous graphene is 370 m 2 / g; its conductivity is 50 S m -1 ; The weight loss at 900 °C is 4.5 wt%.
[0034] 22.6 mg of SnCl 2 ·2H 2 O and 33 mg of Na 2 WO 4 ·2H 2 O solid (weighed according to the mass ratio of 1:1) was successively added to 75 mL of deionized water, then 1.5 mg of anhydrous sodium acetate and 3 mg of ethylene glycol were added, and the precursor was obtained by magnetic stirring for 30 min.
[0035] The precursor was transferred into a reaction tank, placed in a stainless steel reaction kettle, added with 1.5 g of porous graphene, sealed and placed in an oven to react at 180 °C for 7 h. After the reaction, it was cool...
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[0037] Example 3
[0038] Weigh 1 g of graphene oxide prepared by the improved Hummer method, add 3 g of NaOH, grind uniformly, and then heat at 760 °C for 1 h in a tube furnace under nitrogen protection, with a programmed heating rate of 5 °C / min, to obtain porous graphene; Porous graphene has a specific surface area of 390 m 2 / g; its conductivity is 40 S m -1 ; The weight loss at 900 °C is 5 wt%.
[0039] 22.6 mg of SnCl 2 ·2H 2 O and 33 mg of Na 2 WO 4 ·2H 2 O solid (weighed according to the mass ratio of 1:1) was successively added to 75 mL of deionized water, then 2 mg of anhydrous sodium acetate and 1 mg of ethylene glycol were added, and the precursor was obtained by magnetic stirring for 30 min.
[0040] The precursor was moved into a reaction tank, placed in a stainless steel reaction kettle, added with 2 g of porous graphene, sealed and placed in an oven to react at 180 °C for 8 h. After the reaction, it was cooled to room temperature to obtain a yellow-...
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