Nanostructured iron(III)-copper(II) binary oxide: a novel adsorbent for enhanced arsenic removal from aqueous solutions

Zhang, Gaosheng, Ren, Zongming, Zhang, Xiwang and Chen, Jing (2013) Nanostructured iron(III)-copper(II) binary oxide: a novel adsorbent for enhanced arsenic removal from aqueous solutions. Water Research, 47 12: 4022-4031. doi:10.1016/j.watres.2012.11.059


Author Zhang, Gaosheng
Ren, Zongming
Zhang, Xiwang
Chen, Jing
Title Nanostructured iron(III)-copper(II) binary oxide: a novel adsorbent for enhanced arsenic removal from aqueous solutions
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2013-08-01
Sub-type Article (original research)
DOI 10.1016/j.watres.2012.11.059
Volume 47
Issue 12
Start page 4022
End page 4031
Total pages 10
Place of publication United Kingdom
Publisher I W A Publishing
Collection year 2014
Language eng
Formatted abstract
Highlights
• A novel Fe–Cu binary oxide sorbent was developed using a coprecipitation method.
• It has rather high adsorption capacity towards both As(V) and As(III).
• It is very effective at both As(V) and As(III) removing in a wide pH range.
• It could be readily regenerated and repeatedly used.

To obtain a highly efficient and low-cost adsorbent for arsenic removal from water, a novel nanostructured Fe–Cu binary oxide was synthesized via a facile co-precipitation method. Various techniques including BET surface area measurement, powder XRD, SEM, and XPS were used to characterize the synthetic Fe–Cu binary oxide. It showed that the oxide was poorly crystalline, 2-line ferrihydrite-like and was aggregated with many nanosized particles. Laboratory experiments were performed to investigate adsorption kinetics, adsorption isotherms, pH adsorption edge and regeneration of spent adsorbent. The results indicated that the Fe–Cu binary oxide with a Cu: Fe molar ratio of 1:2 had excellent performance in removing both As(V) and As(III) from water, and the maximal adsorption capacities for As(V) and As(III) were 82.7 and 122.3 mg/g at pH 7.0, respectively. The values are favorable, compared to those reported in the literature using other adsorbents. The coexisting sulfate and carbonate had no significant effect on arsenic removal. However, the presence of phosphate obviously inhibited the arsenic removal, especially at high concentrations. Moreover, the Fe–Cu binary oxide could be readily regenerated using NaOH solution and be repeatedly used. The Fe–Cu binary oxide could be a promising adsorbent for both As(V) and As(III) removal because of its excellent performance, facile and low-cost synthesis process, and easy regeneration.
Keyword Fe-Cu binary oxide
Sorption
Arsenate
Arsenite
Regeneration
Adsorption envelopes
Surface-properties
Manganese-oxide
Nanoparticles
Sorption
As(III)
Water
Iron
Mechanism
Oxidation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
 
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