Kazuoki Matsumoto

Moisture Control In-house by Carbon Produced from Woods Wastes-Iron System Constructional Materials

有機性廃棄物のリサイクル手法として炭化過程は簡易で安価な手法である。特に有機性廃棄物中, 最も多く産出される廃木材は炭化を通して, 有用な木炭としてリサイクル利用が期待される。日本は湿気が多く過去, 床下調湿剤として木炭が広く使用されてきた。しかし, 木炭は調湿性能が一般的に低く, 調湿材として利用する場合, 大量の木炭を要する。本研究では, 高調湿能付加木炭・鉄複合材料の創製を指向し, 鉄の酸化過程を用いて木炭表面を鉄で修飾することで, 木炭よりも省スペースかつ高性能な調湿材料, 木炭・鉄複合材料 (Ch-Fe) を製造した。Ch-Feの調湿性能は最高で従来の木炭の約4倍以上を示し, 特に調湿材として最も性能が要求される高湿度領域 (相対湿度0.55以上) における調湿性能が向上された。現代社会において重要な問題の一つである有機性廃棄物のリサイクルおよび地球温暖化防止という視点から, Ch-Feは高性能な調湿材として有益な再資源化方法となりうることが示唆された。

Boric Acid Removal by Activated Carbon.

In search of a better primary treatment of acute boric acid poisoning, the adsorption capacity of boric acid onto activated carbon as an antidote was investigated in vitro.Wide differences in the amount of boric acid adsorbed were recognized depending on individual activated carbons. In order to elucidate the dominant factor in boric acid adsorption, correlations between the properties of activated carbon and the amounts of boric acid adsorbed are discussed. A significant correlation was recognized between the surface pH of activated carbon and the amount of boric acid adsorbed in low equilibrium concentration. It is assumed that the surface pH of activated carbon is a chief factor affecting the amount of boric acid adsorbed.

Changes in Physicochemical Surface Properties of Magnesium Silicate due to Hydrothermal Treatment

Hereunder is given a report of experimental studies that have been performed of the adsorption of argon and pyridine, using magnesium silicate specimens prepared respectively by coprecipitation and by hydrothermal treatment. The heat of adsorption of argon have been obtained from adsorption isotherms at -196° and -191°C. The initial heats of adsorption of argon on two kinds of magnesium silicate specimens were about 6kcal/mole and 4kcal/mole, respectively. The gradual fall, on the isosteric heat curve against coverage was observed at an early stage of adsorption on the sample through the hydrothermal treatment, but the secondary peak after the gradual fall appeared in the heat curve on the sample through the coprecipitation method. The specific surface area vs. SiO2/MgO did not agree with the amount of the acid point vs. SiO2/MgO which was obtained by the adsorption of pyridine.These facts reveal the fact that both kinds of magnesium silicate specimens have heterogeneous surfaces.The amount of the acid point on the sample prepared by the hydrothermal treatment was less than that on the coprecipitated sample.It is concluded that the surface of the magnesium silicate specimens subjected to hydrothermal treatment has smaller amount of acid points, but these acid points are stronger than those on the surface of coprecipitated specimens.