• catalytic ozonation of 2-isopropyl-3-methoxypyrazine in water by γ-alooh and γ-al2o3: comparison of removal efficiency and mechanism

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 512
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     taste and odor (t&o) is a serious problem in drinking water. the t&o compound, 2-isopropyl-3-methoxypyrazine (ipmp), generates an earthy-musty odor in water. in this study, catalytic ozonation by γ-alooh (hao) or γ-al2o3 (rao) was used as an effective method for removing ipmp in water. the comparative removal performance and reaction mechanism of ipmp in catalytic ozonation with different aluminum oxides was investigated. the removal of ipmp in neutral water ph by catalytic ozonation in the presence of hao or rao was 94.2% and 90.0%, respectively. both hao and rao exhibited the good stability and a low leaching of aluminum ions. the effect of water ph and typical anion experiments indicated that surface hydroxyl group was key reaction sites for hao but not for rao. from results of tert-butyl alcohol inhibition, rct values and ozone consumption efficiency in catalytic ozonation, radical dotoh was generated in the solution in hao catalytic ozonation or around the surface of catalyst in rao reaction. the roles of oxidants, including ozone molecules and radical dotoh, were analyzed quantitatively, confirming that the surface hydroxyl group was key site for ozone decomposition to generate radical dotoh in solution in hao catalytic ozonation. ozone was adsorbed physically on the surface and concentrated ozone played an important role in ipmp removal in rao catalytic ozonation. the nitrogen-containing ipmp intermediates generated in catalytic ozonation were determined quantitatively and qualitatively.

سوال خود را در مورد این مقاله مطرح نمایید :

با انتخاب دکمه ثبت پرسش، موافقت خود را با قوانین انتشار محتوا در وبسایت تی پی بین اعلام می کنم
مقالات جدیدترین رویدادها