I am interested in synthesizing (graphitic) carbon nitride (g-CN) from Urea.
Almost all literature states that the synthesis is performed at a heating rate of 2-3°C/min, 500-600°C for 3-4 hours.
I have attempted the synthesis (using 15g of urea) at 550°C for 3h, at a heating rate of 10°C/min (Currently it is not possible to alter the heating rate of the furnace). However, my final product was only melem/melam and not g-CN (i have attached its data).
I am aware that the heating rate can influence the crystallinity, morphology and other such properties; however, will it also determine what my final product will be?
As in, without a heating rate of 2-3°C/min, will I not be able to successfully produce g-CN at all?
This is my main query. I have already posted a question about the influence of the heating rate, but I did not express my query appropriately.
I do intend on repeating the synthesis at 600°C for 4H (15g of urea and 10°C/min ) as these results could simply be due to incomplete polymerization, but I earnestly need some clarity regarding the rate of heating.
hi
Slower heating rate is good for high quality however not compulsory. After this carbonization you got the multilayered CN or you can say particles of CN. If you will do the acid treatment, it will be exfoliated to single sheets. Also you can seperate the high quality CN from your materials.
You can find various papers for this, one such treatment and seperation method is attached herewith.
Best Regards.
Dear Joshua Nigel Fernandes thanks for your interesting question. Please see the following article entitled "Simple Pyrolysis of Urea into Graphitic Carbon Nitride with Recyclable Adsorption and Photocatalytic Activity". The paper is available as public full text on RG. In the experimental procedure it is stated: "After drying at 80 °C for 24 hours, the urea was put in a covered crucible and heated in an oven. The yellow colored g-C3N4 was obtained by heating at 550 °C for 3 hours." Thus the authors don't specify the heating rate at all. Perhaps the drying of the urea prior to the pyrolysis plays some role.
Article Simple Pyrolysis of Urea into Graphitic Carbon Nitride with ...
Please also find attached the Supplementary Information for this article. It does not contain any further details about the heating rate either. Apparently the heating rate is not crucial in this process.
- Badges
- Science topic