Removal of Trace Arsenic To Meet Drinking Water Standards Using Iron Oxide Coated Multiwall Carbon Nanotubes

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• 作者：Susana Addo Ntim ; Somenath Mitra
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2011
• 出版时间：May 12, 2011
• 年：2011
• 卷：56
• 期：5
• 页码：2077-2083
• 全文大小：909K
• 年卷期：v.56,no.5(May 12, 2011)
• ISSN：1520-5134

文摘

This study presents the removal of trace level arsenic to meet drinking water standards using an iron oxide-multiwalled carbon nanotube (Fe-MWCNT) hybrid as a sorbent. The synthesis was facilitated by the high degree of nanotube functionalization using a microwave-assisted process, and a controlled assembly of iron oxide was possible where the MWCNT served as an effective support for the oxide. In the final product, 11 % of the carbon atoms were attached to Fe. The Fe-MWCNT was effective in arsenic removal to below the drinking water standard levels of 10 渭g路L^鈥?. The absorption capacity of the composite was 1723 渭g路g^鈥? and 189 渭g路g^鈥? for As(III) and As(V), respectively. The adsorption of As(V) on Fe-MWCNT was faster than that of As(III). The pseudosecond-order rate equation was found to effectively describe the kinetics of arsenic adsorption. The adsorption isotherms for As(III) and As(V) fitted both the Langmuir and Freundlich models.