محبوبترین نویسندگان :
نویسندگان مقالات پربازدید :
مجله مهندسی شیمی
جزئیات رویداد
اینستاگرام تی پی بین
همایش ، رویداد ، ژورنال
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  • preparation of oxygen-vacant tio2−x and activated carbon fiber composite using a single-step thermal plasma method for low-concentration elemental mercury removal

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    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 593
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     oxygen-vacant tio2 (tio2−x) nanoparticles and tio2−x/activated carbon fiber (acf) composites were developed via a n2/ar/he thermal plasma system. the tio2−xnanoparticles and tio2−x/acf composites were characterized with tem, xrd, uv–vis, esem and n2 adsorption isotherms. the removal effectiveness of tio2−x/acf for gaseous hg0 at ppb concentration level and various conditions was subsequently evaluated. the experimental results indicated that the formed tio2−x nanoparticles had a size within 10–40 nm and a mixture of anatase and rutile phases. the tio2−x formed at 7% n2 concentration had an evident red-shift in wavelength absorption. the esem and n2 adsorption results suggested that the synthesized tio2−x nanoparticles unevenly deposited on the acf surface causing a decrease in total and micropore surface areas/volumes. hg breakthrough tests revealed that tio2−x/acf composites had a greater hg removal under uv or visible-light irradiation than those obtained in the dark condition. the presence of o2 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 h2o and the physisorption nature of hg species on the light-induced hydrophilic tio2−x/acf surface.

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