Preparation method and application of Z-type photocatalyst MgAl LDH/CN-H
A photocatalyst, g-c3n4 technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of high photogenerated electron-hole recombination rate, narrow light absorption range, and poor utilization Advanced problems, to achieve the effect of improving the separation rate of photogenerated carriers and increasing the comparison area
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[0033] Example 1
[0034] (1) Preparation of CN-H material
[0035] Place the melamine in a crucible with a lid, heat it to 500°C at a heating rate of 2°C / min in a muffle furnace, keep it for 2 hours, and then heat it to 520°C for 2 hours. After cooling to room temperature, the yellow product was collected and ground into powder to obtain g-C 3 N 4 (Marked as CN). 1g g-C 3 N 4 HNO dispersed in 200ml 3 (8mol / L) solution, refluxed at 90℃ for 3h, cooled to room temperature, centrifuged and washed several times, and dried at 80℃ overnight. After grinding, the sample powder was obtained, and the acidified g-C 3 N 4 The sample is labeled CN-H.
[0036] g-C 3 N 4 See the TEM image of CN-H figure 1 . From figure 1 It can be seen: the original g-C 3 N 4 It appears as a thin layer with wrinkles (a layer with a larger two-dimensional size), while CN-H has a small flake shape, and there are more pores between the small flakes. Shows that the acidification process makes g-C 3 N 4 It broke an...
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[0043] Example 2
[0044] (1) Preparation of CN-H material
[0045] Place the melamine in a crucible with a lid, heat it to 500°C at a heating rate of 2°C / min in a muffle furnace, keep it for 2 hours, and then heat it to 520°C for 2 hours. After cooling to room temperature, the yellow product was collected and ground into powder to obtain g-C 3 N 4 (Marked as CN). 1g g-C 3 N 4 HNO dispersed in 200ml 3 8mol / L) solution, refluxed at 95℃ for 2h, cooled to room temperature, centrifuged and washed several times, and dried at 80℃ overnight. After grinding, the sample powder was obtained, and the acidified g-C 3 N 4 The sample is labeled CN-H.
[0046] (2) Preparation of MgAl LDH material
[0047] Add 0.252g citric acid and 1.21g urea to the mixed solution of 60mL ethanol and water (V Ethanol :V water =1:1), stirring for 30 minutes. Then add 1.026g of Mg(NO 3 ) 2 ·6H 2 O and 0.75g Al(NO 3 ) 3 ·9H 2 O, completely dispersed in the above solution, hydrothermally reacted at 160°C for 48h. ...
Example Embodiment
[0060] Example 3
[0061] (1) Preparation of CN-H material
[0062] Place the melamine in a crucible with a lid, heat it to 500°C at a heating rate of 2°C / min in a muffle furnace, keep it for 2 hours, and then heat it to 520°C for 2 hours. After cooling to room temperature, the yellow product was collected and ground into powder to obtain g-C 3 N 4 (Marked as CN). 1g g-C 3 N 4 HNO dispersed in 200ml 3 (4mol / L) solution, reflux at 100℃ for 1h, cool to room temperature, centrifuge and wash for several times, and dry at 80℃ overnight. After grinding, sample powder is obtained, and the acidified g-C 3 N 4 The sample is labeled CN-H.
[0063] (2) Preparation of MgAl LDH material
[0064] Add 0.126g citric acid and 0.605g urea to the mixed solution of 60mL ethanol and water (V Ethanol :V water =1:1), stirring for 30 minutes. Then add 0.513g of Mg(NO 3 ) 2 ·6H 2 O and 0.375g Al(NO 3 ) 3 ·9H 2 O, completely dispersed in the above solution, hydrothermally reacted at 180°C for 24h. The Mg...
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