Plasma and Fusion Research
Volume 19, 1205012 (2024)
Rapid Communications
- 1)
- National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
- 2)
- The Graduate University for Advanced Studies, SOKENDAI, 322-6 Oroshi-cho, Toki 509-5292, Japan
- 3)
- ANAORI CARBON Co., Ltd., 6-20 Hatakeda-cho, Ibaraki 567-0028, Japan
- 4)
- Functional Materials & Nanotechnology CoE, Walailak University, Nakhon Si Thammarat, 80160, Thailand
Abstract
We developed a new silica (SiO2) removal technique that can maximize biomass-based activated carbon adsorption performance. SiO2 removal is one of the key processes in making activated carbon suitable for cryosorption pumps in fusion machines. In this study, we employed an evaporation process to remove SiO2 by high-temperature vacuum heating. The charcoal made from rice straw was heated at 1800℃ for 1 h at approximately 10 Pa in a vacuum furnace. We found that SiO2 amount was significantly reduced from 15.8 wt% to 4.20 wt% due to vacuum heating. In addition, the result of surface element mapping analysis using energy-dispersive X-ray spectroscopy (EDX) indicated a considerable decrease in the oxygen content of SiO2. We demonstrated the great potential of activated carbon derived from rice straw as an adsorbent for high-performance cryosorption pumps.
Keywords
cryosorption pump, activated carbon, silica, vacuum heating, unutilized biomass
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