Removal of As(V) and As(III) by reclaimed iron-oxide coated sands

doi:10.1016/j.jhazmat.2007.09.031

CNU IR > College of Sustainable Environment and Recreation > Dept. of Environmental Engineering and Science (including master's program) > Periodical Articles > Item 310902800/21674

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Title:	Removal of As(V) and As(III) by reclaimed iron-oxide coated sands
Authors:	Jia-Chin Hsu Chien-Jung Lin Chih-Hsiang Liao Shyi-Tien Chen
Contributors:	環境工程與科學系環境資源管理系
Keywords:	Arsenate Arsenite Iron-oxide coated sand pHzpc Adsorption isotherm
Date:	2008-05
Issue Date:	2009-10-05 14:12:50 (UTC+8)
Abstract:	This paper aims at the feasibility of arsenate and arsenite removal by reclaimed iron-oxide coated sands (IOCS). Batch experiments were performed to examine the adsorption isotherm and removal performance of arsenic systems by using the IOCS. The results show that the pHzpc of IOCS was about 7.0 ± 0.4, favoring the adsorption of As(V) of anion form onto the IOCS surface. As the adsorbent dosage and initial arsenic concentration were fixed, both the As(V) and As(III) removals decrease with increasing initial solution pH. Under the same initial solution pH and adsorbent dosage, the removal efficiencies of total arsenic (As(V) and As(III)) were in the order as follows: As(V) > As(V) + As(III) > As(III). Moreover, adsorption isotherms of As(V) and As(III) fit the Langmuir model satisfactorily for the four different initial pH conditions as well as for the studied range of initial arsenic concentrations. It is concluded that the reclaimed IOCS can be considered as a feasible and economical adsorbent for arsenic removal.
Relation:	Journal of Hazardous Materials 153(1-2)：p.817-826
Appears in Collections:	[Dept. of Environmental Engineering and Science (including master's program)] Periodical Articles [Dept. of Environmental Resources Management] Periodical Articles

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