Adsorption of arsenic on multiwall carbon nanotube-zirconia nanohybrid for potential drinking water purification

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• 作者：Susana Addo Ntim ; Somenath Mitra ; ^{mitra@njit.edu} ; ^{Somenath.mitra@njit.edu} ; ^xm3@njit.edu
• 关键词：Arsenic ; Carbon nanotubes ; Zirconia ; Water ; Adsorption ; Kinetics
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 期刊代码：125_00219797
• 类别：ch
• 出版时间：1 June, 2012
• 卷：375
• 期：1
• 页码：154-159
• 文件大小：776 K

摘要

The adsorptive removal of arsenic from water using a multiwall carbon nanotube-zirconia nanohybrid (MWCNT-ZrO₂) is presented. The MWCNT-ZrO₂ with 4.85%zirconia was effective in meeting the drinking water standard levels of 10 渭g L^鈭?. The absorption capacity of the composite were 2000 渭g g^鈭? and 5000 渭g g^鈭? for As(III) and As(V) respectively, which were significantly higher than those reported previously for iron oxide coated MWCNTs. The adsorption of As(V) on MWCNT-ZrO₂ was faster than that of As(III), and a pseudo-second order rate equation effectively described the uptake kinetics. The adsorption isotherms for As(III) and As(V) fitted both the Langmuir and Freundlich models. A major advantage of the MWCNT-ZrO₂ was that the adsorption capacity was not a function of pH.