https://scholars.lib.ntu.edu.tw/handle/123456789/425155
標題: | Preparation of oxygen-vacant TiO <inf>2-x</inf> and activated carbon fiber composite using a single-step thermal plasma method for low-concentration elemental mercury removal | 作者: | HSING-CHENG HSI Tsai, Cheng Yen |
關鍵字: | Carbon fiber | Mercury | Oxygen vacancy | Photocatalyst | Thermal plasma | 公開日期: | 15-八月-2012 | 出版社: | ELSEVIER SCIENCE SA | 卷: | 200-202 | 起(迄)頁: | 18 | 來源出版物: | Chemical Engineering Journal | 摘要: | Oxygen-vacant TiO 2 (TiO 2-x ) nanoparticles and TiO 2-x /activated carbon fiber (ACF) composites were developed via a N 2 /Ar/He thermal plasma system. The TiO 2-x nanoparticles and TiO 2-x /ACF composites were characterized with TEM, XRD, UV-Vis, ESEM and N 2 adsorption isotherms. The removal effectiveness of TiO 2-x /ACF for gaseous Hg 0 at ppb concentration level and various conditions was subsequently evaluated. The experimental results indicated that the formed TiO 2-x nanoparticles had a size within 10-40nm and a mixture of anatase and rutile phases. The TiO 2-x formed at 7% N 2 concentration had an evident red-shift in wavelength absorption. The ESEM and N 2 adsorption results suggested that the synthesized TiO 2-x nanoparticles unevenly deposited on the ACF surface causing a decrease in total and micropore surface areas/volumes. Hg breakthrough tests revealed that TiO 2-x /ACF composites had a greater Hg removal under UV or visible-light irradiation than those obtained in the dark condition. The presence of O 2 up to 12% greatly enhanced the Hg removal, implying the positive effects of catalytic oxidation. However, moisture reduced Hg removal performance, especially when visible-light irradiation was applied. These results revealed the competitive adsorption between Hg species and H 2 O and the physisorption nature of Hg species on the light-induced hydrophilic TiO 2-x /ACF surface. © 2012 Elsevier B.V. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/425155 | ISSN: | 13858947 | DOI: | https://api.elsevier.com/content/abstract/scopus_id/84865543399 10.1016/j.cej.2012.06.021 |
顯示於: | 環境工程學研究所 |
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