Physical Sciences and Mathematics Commons^™

Encapsulated Chitosan-Modified Magnetic Carbon Nanotubes For Aqueous-Phase Crvi Uptake, Mian Muhammad-Ahson Aslam, Walter Den, Hsion-Wen Kuo

Water Resources Science and Technology Faculty Publications

This work demonstrates the performance of a composite adsorbent encapsulated with chitosan (CS) and maghemite-doped multiwall carbon nanotubes (MWCNTs). Hexavalent chromium (Cr^VI) was used as the representative hazardous heavy metal to characterize the adsorption behavior of the composite beads. The chromium speciation chemistry combined with the chitosan surface chemistry rendered pH at 4 to be the optimized condition in which the uptake of Cr^VI was quantitatively most effective. The Langmuir isotherm with a maximum adsorption capacity of 119 mg g⁻¹ at 298 K was observed. The Cr^VI adsorption studies using partial compositions of the beads …