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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/27017


    標題: Impact of selected solution factors on arsenate and arsenite removal by nanoiron particles
    作者: Tanboonchuy, Visanu
    Hsu, Jia-Chin
    Grisdanurak, Nurak
    Liao, Chih-Hsiang
    貢獻者: 職業安全衛生系
    環境資源管理系
    關鍵字: Arsenic
    Arsenate
    Arsenite
    Nanoiron particles
    Zero-valent iron
    日期: 2011-01
    上傳時間: 2013-10-23 11:55:42 (UTC+8)
    出版者: SPRINGER
    摘要: Introduction The nano-scale zero-valent iron (NZVI) was used for the removal of arsenite (As(III)) and arsenate (As(V)) in aqueous solution. Batch experiments were conducted to investigate the effects of initial pH, initial arsenic concentration, dissolved oxygen (DO), and ratio of As(III)/As(V) on arsenic removal.

    Materials and methods The NZVI synthesized by using NaBH4 and FeCl3 was put into use right after its synthesis. The arsenic treatment system of recirculation mode consists of a reactor with a liquid volume of 4.4 L, which provides dual function of reactants reaction and particles settling in one unit.

    Results and discussion Consequently, the pseudo-first order rate equations can be used to describe the removal kinetics for As(V) at pH 4 and 7, while the pseudo-second order reaction was observed for As(V) at pH 9 and As(III) at all pH's studied. Arsenic removal rates of both As(V) and As(III) were lower in the system with lower DO. The rate of As(III) removal decreased with the increase of its initial concentration. In contrast, the removal rate of As(V) still remained significantly high as its initial concentration increased.

    Conclusions This study reveals that low pH and high DO will favor arsenic removal. With the mixture of As(III) and As(V), the total arsenic was removed faster than solution containing As(III) or As(V) alone. In addition, the mixture with higher fraction of As(V) resulted in higher arsenic removal.
    Appears in Collections:[職業安全衛生系(含防災所)] 期刊論文
    [環境資源管理系(所)] 期刊論文

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