Seawater Resistance of Porous Carbon Materials made from Rice Hull

抄録

Recently, new porous carbon materials have been developed utilizing the natural porous structures of some plant matters. The carbon materials are manufactured by mixing with the phenol resin, pressure forming, drying, and then carbonizing at 900℃. The authors have been studying the carbon material made from the defatted rice bran (RB carbon: RBC). However, the RBC includes some deliquescent components, and therefore has large hygroscopic expansion and large reduction of the mechanical strengths under wet and aquatic conditions. The low water resistance is associated with the inorganic components of P and K in the rice bran. In contrast, the rice hull does not include such inorganic components. In this study, the authors proposed the production of the seawater-resistant rice-hull silica carbon (RHS carbon: RHSC) from the rice hull and the RBC. After immersing the RHSC in seawater, the decrease of the compressive strength and the precipitation of the mineral ingredients were not observed, and the strain was 0.25%. Therefore, the RHSC is a material which has the stable water-resistance in seawater.