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Kamigyō-ku, Japan

Ishibashi N.,Gunma University | Ishibashi N.,Carbo tec. Co. | Yamamoto K.,Gunma University | Yamamoto K.,Carbo tec. Co. | And 2 more authors.
Journal of Polymers and the Environment | Year: 2014

The hydrothermal treatments were conducted prior to the carbonization of oak woods and the obtained charcoals were activated using carbon dioxide or water vapor. The hydrothermal treatments brought about the elutions of acid-soluble lignin fractions as well as hemicellulose fractions accompanied with the decomposition of lignin carbohydrate complexes in the cell walls, which lowered not only the carbon yield of charcoal but also the crystal parameters for the carbon crystallites. However, the activated carbons (AC) produced via the hydrothermal pre-treatment showed superior adsorption properties especially for the adsorptions of 2-methylisoborneol and geosmin as compared with the untreated commercial AC. The hydrothermal treatments prior to the carbonization have some potential to increase the fractions of meso-pores effective for the adsorption of globular shaped molecules. © 2013 Springer Science+Business Media New York. Source


Ishibashi N.,Gunma University | Ishibashi N.,Carbo tec. Co. | Yamamoto K.,Gunma University | Yamamoto K.,Carbo tec. Co. | And 2 more authors.
Sen'i Gakkaishi | Year: 2012

Influence of the hydrothermal pre-treatments on the carbonization behaviors for bark and sap wood portions of sawtooth oak wood was investigated. The shrinkage in the course of carbonization for the bark portions was promoted markedly by applying the hydrothermal pre-treatments. To the contrary as for the sap wood portions the shrinkage was suppressed. The wide-angle X-ray diffraction measurements revealed that the hydrothermal treatments also affected the formation of the carbon layer stacking. The hydrothermal pre-treatments seem to have some potential to control the shrinkage and the formation of carbon crystallites in the production of charcoal from woody biomass. Source


Kawahara Y.,Gunma University | Kawahara Y.,Kyoto Institute of Technology | Ishibashi N.,Gunma University | Ishibashi N.,Carbo tec. Co. | And 5 more authors.
Sustainable Materials and Technologies | Year: 2015

We attempted to use feathers for the production of activated carbon (AC). A water-soluble resol-type phenolic resin was hybridized to prevent the liquefaction of the feathers and to control the graphitization degree of charcoal. The hybridization could effectively increase the yield of charcoal over 30% and maintained the graphitization degree at approximately 0.1, suitable for the production of AC. The Brunauer-Emmett-Teller (BET) surface area and the iodine-adsorption capacity of hybrid charcoal-based AC were 706 m2/g and 550 mg/g, respectively, which were 1.7-1.8 times greater than those of the feather-based AC at a similar activation level. © 2015 The Authors. Published by Elsevier B.V. Source


Yamamoto K.,Gunma University | Yamamoto K.,Carbo tec. Co. | Kawahara Y.,Gunma University | Shioya M.,Tokyo Institute of Technology | And 2 more authors.
Journal of Polymers and the Environment | Year: 2012

Triacetylcellulose(TAC)-based globular activated carbons having the adsorption capacity comparable with commercial ones have been derived using a carbonization system developed for this purpose. The carbonization of TAC proceeds through a liquid phase causing bubbling due to the emission of the decomposition gases. The phosphorus compounds resulting from the starting material of TAC waste promote the activation reactions to produce micro-pores. © 2012 Springer Science+Business Media, LLC. Source

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