著者
山根 小雪 中井 智司 李 炳大 細見 正明 勝 宣賢
出版者
The Society of Chemical Engineers, Japan
雑誌
化学工学論文集 (ISSN:0386216X)
巻号頁・発行日
vol.28, no.5, pp.518-521, 2002-09-20
参考文献数
7
被引用文献数
1 1

二酸化チタン光触媒を繊維状活性炭に担持させたFAC/TiO<sub>2</sub>シート材を用いた脱臭システムの構築を目標とし,メチルメルカプタン(MM)の分解経路及び硫黄収支の解明を試みた.まず脱臭効率について検討し,TiO<sub>2</sub>が氏i株)O線分解よりも優れた脱臭効果を示すこと,FAc/TiO<sub>2</sub>シートはTiO<sub>2</sub>単独よりも優れた脱臭効果を示すことを確認した.次にFAC/TiO<sub>2</sub>シートによるMM分解生成物として,二硫化ジメチル,二硫化炭素,二酸化硫黄,メタンスルホン酸イオン,硫酸イオンを定性した.また,MM分解における硫黄収支は常に50%以上,実験終了時には79%を把握した.一方,比較のために行った氏i株)O線分解では,これら5種の物質に加えて硫化水素も検出され,硫黄収支をほぼ100%明らかにした.
著者
中井 智司 山根 小雪 細見 正明
出版者
Japan Society on Water Environment
雑誌
水環境学会誌 = Journal of Japan Society on Water Environment (ISSN:09168958)
巻号頁・発行日
vol.23, no.11, pp.726-730, 2000-11-10
参考文献数
11
被引用文献数
3 4

Four polyphenols, gallic acid (GA), ellagic acid (EA), pyrogallic acid (PA), and (+)-catechin (CAT), released from <i>Myriophyllum spicatum</i>, are anti-algal allelochemicals. In this paper, we investigated the inhibitory effects of each of these polyphenols on blue-green algae (<i>Microcystis aeruginosa</i> and <i>Phormidium tenue</i>), green algae (<i>Selenastrum capricornutum</i> and <i>Scenedesmus quadricauda</i>), and diatoms (<i>Nitzschia palea</i> and <i>Achnanthes minutissima</i>). We also determined the collective actions of the 4 polyphenols on the inhibition of algal growth.<br>Among the 6 algae, <i>M. aeruginosa</i> was the only one whose growth was significantly inhibited by each of the 4 polyphenols, while PA, GA, and EA each caused some degree of growth inhibition in <i>P. tenue</i> and the 2 green algae. Because none of the 4 polyphenols showed any inhibitory effect on growth of <i>N. palea</i> and growth of <i>A. minutissima</i> was not inhibited by PA, GA or CAT, diatoms appear to have strong resistance to such polyphenols. The algal assays we used to investigate the collective effects of polyphenols showed that (<i>i</i>) blue-green algae, <i>M. aeruginosa</i> and <i>P. tenue</i> were most sensitive to the synergistic actions of PA, GA and CAT, and (<i>ii</i>) the synergistic actions toward the 2 green algae and the 2 diatoms were concentration-dependent. These results indicate the possible feasibility of selectively controlling growth of blue-green algae through use of these polyphenols and/or the allelopathic effects of <i>M. spicatum</i>. Measurement of the autoxidation rates of the 4 polyphenols suggests that (<i>i</i>) their inhibitory effects on the growth of <i>M. aeruginosa</i> could be caused by products of their autoxidation, such as radicals, and (<i>ii</i>) the synergistic action of PA, GA and CAT might be due to acceleration of their autoxidation resulting in increasing production of such autoxidation products.