Fabrication of porous SiO2/C composite from rice husks |
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| Affiliation: | 1. School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea;2. Fraunhofer Institute for Solar Energy System (ISE), Heidenhofstrasse 2, 79110 Freiburg, Germany;3. Nonproliferation System Research Division, Korea Atomic Energy Research Institute (KAERI), 989-111 Daedeok-daero, Yuseong-gu, Daejeon, Republic of Korea;4. Department of Environmental Engineering, Sangmyung University, 300 Anseo-dong, Dongnam-gu, Cheonan-si, Chungnam Province 330-720, Republic of Korea;1. Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, PR China;2. Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing 211816, PR China;3. Energy Research Institute@ NTU (ERIAN), Nanyang Technological University, 1 Clean Tech Loop, Singapore 637141, Singapore;4. Collaborative Innovation Center of Renewable Energy Materials, Guangxi University, Nanning 530004, PR China;1. Korea Institute of Ceramic Engineering and Technology (KICET), 202, Osongsaengmyeong 1-ro, Osong-eup, Heungdeok-gu, Chenongju-si, Chungcheongbuk-do 28160, Republic of Korea;2. Division of Chemical Engineering & Bio Engineering, Hanyang University, Seoul, Republic of Korea;3. School of Biological Sciences College of Natural Sciences, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju, Chungcheongbuk-do 28644, Republic of Korea |
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| Abstract: | Porous SiO2/carbon composites were fabricated by heating pellets composed of rice husk (RH) powders in small (<74 μm), medium(74–175 μm) and large(150–300 μm) sizes. The contents of the small RH were fixed at 30 mass% and the RH pellets molded at 10, 15, and 30 MPa were heated at 800–1150 °C in an inert atmosphere. The weight loss due to the thermal decomposition of the organic materials in the pellet peaked at 1000 °C, whereas the specimen heated at 1000 °C showed the lowest carbon content and density, 29 mass% and 0.40 g cm−3, respectively. The SiO2 phase of the specimens were amorphous at 800 and 1150 °C, but a cristobalite phase was visible at 1000 °C. The specimen fire at 1000 °C showed a higher compressive strength than the others, and the large RH particles were seen to increase the strength of the product while an increase in molding pressure decreased the medium pore size, from 17 to 7 μm, and increased the strength, from 0.25 to 3.52 MPa. The specific surface area (SSA) of the specimen peaked at 450 m2 g−1, at 1000 °C and finally, the mesopore size of the specimens was similar throughout, at ∼2 nm. |
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