การสังเคราะห์วัสดุคาร์บอนสูงจากแคลเซียมคาร์ไบด์
Carbide-derived Carbon (CDC) has been used in many applications, such as electronic devices and adsorbents. Typically, CDC synthesis requires high temperature and expensive carbide materials. In this work, calcium carbide was used as a low-cost carbon source. It was assumed that oxidizing agents and...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Senior Project |
| Language: | Thai |
| Published: |
จุฬาลงกรณ์มหาวิทยาลัย
2014
|
| Subjects: | |
| Online Access: | https://digiverse.chula.ac.th/Info/item/dc:9829 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Chulalongkorn University |
| Language: | Thai |
| Summary: | Carbide-derived Carbon (CDC) has been used in many applications, such as electronic devices and adsorbents. Typically, CDC synthesis requires high temperature and expensive carbide materials. In this work, calcium carbide was used as a low-cost carbon source. It was assumed that oxidizing agents and radical initiators could be used as reagent to synthesize carbon materials at low temperature. KNO₃, NaClO₄∙H₂O, Benzoyl peroxide, Oxone®, Pd(OAc)₂ and Azobisisobutyronitrile (AIBN) were selected as reagent. Solid-state reaction was selected as a synthesis method. Mixture of calcium carbide and reagent was grinded and resulting product was washed. It was found that Oxone® and Pd(OAc)₂ gave higher yields than other reagents. Optimized condition for reaction using Oxone® was using 0.025 equivalent of Oxone®, grinding for 10 minutes and washing with 6M HCl. This condition gave 0.2808 g of dark gray solid as a product per 1 g of initial calcium carbide. The product was characterized by FT-IR, FT-Raman, elemental analysis and optical microscope. The result showed that most of product was CaCO₃ formed during washing process. After washed with acid, remaining calcium (II) ion reacted with sodium bicarbonate, a washing solution, to give calcium carbonate. Synthesis using Pd(OAc)₂ as a reagent under the same condition gave 0.3300 g of black solid per 1 g of starting calcium carbide. The product was characterized by FT-IR, FT-Raman, elemental analysis and optical microscope. The result showed that 22.51% of the product was carbon, but the product also contained CaCO₃. The washing method was modified to remove CaCO₃. Only Pd(OAc)₂ gave higher yield than control group and gave 0.1152 g of black solid per 1 g of initial calcium carbide. It was found that the product did not show any significant signal in IR spectrum. To conclude, synthesis of CDC from calcium carbide using KNO₃, NaClO₄∙H₂O, Benzoyl peroxide, Oxone® and AIBN could not give desired product. But synthesis using Pd(OAc)₂ might give desired carbon materials. This product is subject for further study. |
|---|