Nitrogen doped carbon/carbon nitride photocatalyst material and one-step synthesis method thereof
A technology of nitrogen-doped carbon and synthesis method, which is applied in the field of photocatalysis and can solve environmental hazards and other problems
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preparation example Construction
[0020] Its concrete preparation method step is as follows:
[0021] 1) take a certain quality of urea and place it in a crucible, the quality of urea is 20g;
[0022] 2) Take a small amount of citric acid, and evenly disperse it in the urea weighed in step 1), the quality of citric acid is 10-1000mg;
[0023] 3) Cover the crucible in step 2, place it in a muffle furnace, and calcine it for 2-4 hours to obtain a nitrogen-doped carbon / carbon nitride photocatalyst material.
[0024] As a preferred solution, urea is used as the carbon nitride precursor.
[0025] As a preferred solution, a small amount of citric acid is used as the carbon source.
[0026] As a preferred solution, the calcination temperature in step 3) is 400-600° C., and the holding time is 2-4 hours.
[0027] The photocatalytic performance of nitrogen-doped carbon / carbon nitride photocatalysts was evaluated by splitting water to produce hydrogen under visible light (λ ≥ 420 nm). The experimental process is as ...
Embodiment 1
[0032] A kind of one-step synthetic method of nitrogen-doped carbon / carbon nitride photocatalyst is as follows: 1) take by weighing certain quality urea and place in crucible, the quality of urea is 20g; 2) take by weighing a small amount of citric acid, and evenly disperse to Step 1) In the weighed urea, the mass of citric acid is 20 mg; 3) Cover the crucible in step 2, place it in a muffle furnace, and calcinate at 550°C for 4 hours to obtain nitrogen-doped carbon / Carbon nitride photocatalyst material, denoted as CN-20.
Embodiment 2
[0034] In order to examine the effect of different citric acid additions on the photocatalytic performance of nitrogen-doped carbon / carbon nitride photocatalysts, except for the different additions of citric acid, other reaction conditions such as urea addition (20g), calcination temperature (550°C), Incubation time (4h) etc. are all identical with embodiment 1. The results show that: when the amount of citric acid added is 0mg (denoted as CN), when it is pure carbon nitride, its average photocatalytic hydrogen production is 14.5umolh -1 ; When the amount of citric acid added was 15mg (denoted as CN-15), its average photocatalytic hydrogen production was 44.9umolh -1 ; When the amount of citric acid added was 25mg (denoted as CN-25), its average photocatalytic hydrogen production was 39.3umolh -1 ; while in Example 1, when the amount of citric acid added was 20mg, its average photocatalytic hydrogen production was 63.7umolh-1 . This shows that the addition of citric acid to ...
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