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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/29593


    標題: Arsenic removal by nanoiron coupled with gas bubbling system
    作者: Nakseedee, Piyanate
    Tanboonchuy, Visanu
    Pimpha, Nuttaporn
    Khemthong, Pongtanawat
    Liao, Chih-Hsiang
    Grisdanurak, Nurak
    貢獻者: 環境資源管理系
    關鍵字: Arsenic
    Zero-valent iron
    NZVI
    Gas bubbling
    Groundwater
    日期: 2015-02
    上傳時間: 2016-04-19 19:01:23 (UTC+8)
    出版者: Elsevier Science Bv
    摘要: Arsenic removal was investigated by nanoscale zero valent iron (NZVI) under CO2-air bubbling system. The measure of gas bubbling was to acidify the solution and oxygenate NZVI adsorbent. Effects of carbonation and aeration periods were studied in four different scenarios. The most favorable condition was as follows; pretreatment step: CO2 bubbling (300 mL/min for 5 min) and air bubbling (300 mL/min for 10 min), and treatment step: Continuous air bubbling (300 mL/min). In the condition of having an initial concentration of 1000 mu g/L, As(III) and As(V) could be removed by 78 and 99%, respectively. When we applied this conditions to the field groundwater spiked with arsenic, the removal efficiency was a little higher than the system both without gas- and acidic chemical-pretreatment. The X-ray absorption near edge spectroscopy (XANES) suggested the apparent valence states of the activated NZVI to be 2(+) and 3(+). (C) 2014 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
    關聯: Journal of The Taiwan Institute of Chemical Engineers, v.47, pp.182-189
    Appears in Collections:[環境資源管理系(所)] 期刊論文

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