Molded micro- and mesoporous carbon/silica composite from rice husk and beet sugar |
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| Authors: | Seiji Kumagai Hirotaka Ishizawa Yuta Aoki Yasuhiro Toida |
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| Affiliation: | 1. Department of Machine Intelligence and Systems Engineering, Akita Prefectural University, Tsuchiya-aza-ebinokuchi 84-4, Yurihonjo 015-0055, Japan;2. Petroleum Refining Research and Technology Center, Japan Energy Corporation, Niizominami 3-17-35, Toda 335-8502, Japan;1. College of Chemistry, Jilin University, Changchun 130012, China;2. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People''s Republic of China, Heilongjiang University, Harbin 150080, China;1. Laboratory of Chemical Process, Federal Technological University of Parana, Toledo, PR, Brazil;2. Department of Chemical Engineering, State University of Maringa, Maringá, PR, Brazil;3. Department of Chemical Engineering, Western Paraná State University, Toledo, PR, Brazil;1. Key Laboratory of New Membrane Materials, Ministry of Industry and Information Technology, China;2. Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse, China;3. School of Environment and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;4. Jiangsu Engineering Laboratory for Environment Functional Materials, Huaiyin Normal University, Huaian 223300, China |
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| Abstract: | A molded carbon/silica composite with high micro- and mesoporosity, as well as a high bulk density, was fabricated by activating a disk-molded precursor made from carbonized rice husk (RH) and beet sugar (BS) at 875 °C in CO2. The pore structure of the RH- and BS-based carbon/silica composite (RBC) was analysed in relation to the bulk density. An activation time of 2.0 h provided the largest BET specific surface area (1027 m2/g) and total pore volume (0.68 cm3/g) and a low bulk density (0.54 g/cm3). An RBC that was first activated for 1 h was immersed again in BS syrup and then activated in CO2 for 1 h. This two-step activation process provided both a high bulk density (0.69 g/cm3) and a highly textured structure (BET specific surface area, 943 m2/g; total pore volume, 0.56 cm3/g). The immersion in BS syrup was useful for improving the texture without reducing the bulk density, in comparison to one-step activation for 1.0 h. The suspension of the RBCs was basic because of the residual inorganic compounds of potassium and calcium. However, the basicity of the suspension was alleviated by washing the RBCs with water. |
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