Photocatalytic carboxylation conversion of chlorophenols and carbon dioxide on carbon nitride nanotubes
A technology of carbon dioxide and nanotubes, applied in physical/chemical process catalysts, preparation of organic compounds, organic chemistry, etc., can solve problems such as reaction conditions hindering the practical application of carbon dioxide
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Embodiment example 1
[0033] 1) C 3 N 4 Preparation of (CN) photocatalysts:
[0034] 5.0 g of melamine was heated in a 500 °C ceramic crucible at a rate of 5 °C / min for 2 h to synthesize C 3 N 4 . A pale yellow sample was collected and ground into powder after pyrolysis.
[0035] 2) Tubular C 3 N 4 Preparation of (TCN) Photocatalysts:
[0036] 1.0 g of melamine was dispersed in 70 ml of water at 80°C. The solution was transferred to a 100 mL autoclave and heated at 180 °C for 10 hours. The precursor was obtained after centrifugation, washed with ethanol, and dried in a vacuum oven for 12 h. Tubular C was synthesized by heating at 500 °C for 2 h at a rate of 5 °C / min 3 N 4 . Subsequently, the samples were washed with water and ethanol and dried under vacuum. tubular C 3 N 4 was named TCN.
[0037] 3) Ammonium carbonate treated tubular C 3 N 4 (TCNA) Photocatalyst Preparation:
[0038] 1.0 g of melamine, 0.36 g of ammonium carbonate were dispersed in 70 ml of water at 80°C. The s...
Embodiment example 2（
[0047] Implementation Case 2 (Table 1, Entry 1):
[0048] 10.0 mg CN was added to a 10 mL two-neck round-bottom flask, and the air in the round-bottom flask was replaced with carbon dioxide. 5 mL of deionized water containing 0.2 mmol of p-chlorophenol was then injected into the round bottom flask. Subsequently, the reaction vessel was heated at 0.75 W / cm -2 After stirring under blue LED for 12 h, the conversion rate of p-chlorophenol was 32.4%, and the yield of carboxylated product was 27.5%.
[0049]
Embodiment example 3（
[0050] Implementation Case 3 (Table 1, Item 5):
[0051] 10.0 mg of TCN was added to a 10 mL two-neck round-bottom flask, and the air in the round-bottom flask was replaced with carbon dioxide. 5 mL of deionized water containing 0.2 mmol of p-chlorophenol was then injected into the round bottom flask. Subsequently, the reaction vessel was heated at 0.75 W / cm -2 After stirring under blue LED for 12 h, the conversion rate of p-chlorophenol was 40.6%, and the yield of carboxylated product was 31.5%.
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