Impact of selected solution factors on arsenate and arsenite removal by nanoiron particles

doi:10.1007/s11356-011-0442-3

Chia Nan University of Pharmacy & Science Institutional Repository > 環境永續暨休閒學院 > 職業安全衛生系(含防災所) > 期刊論文 > Item 310902800/27017

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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.
關聯:	Environ Sci Pollut Res , 18(6), pp.857-864
显示于类别:	[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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