Abstract
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 10μgL−1. The absorption capacity of the composite were 2000μgg−1 and 5000μgg−1 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.
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