TY - JOUR
T1 - Enhanced adsorption of mercury ions on thiol derivatized single wall carbon nanotubes
AU - Bandaru, Narasimha Murthy
AU - Reta, Nekane
AU - Dalal, Habibullah
AU - Ellis, Amanda V.
AU - Shapter, Joseph
AU - Voelcker, Nicolas H.
PY - 2013/10/5
Y1 - 2013/10/5
N2 - Thiol-derivatized single walled carbon nanotube (SWCNT-SH) powders were synthesized by reacting acid-cut SWCNTs with cysteamine hydrochloride using carbodiimide coupling. Infrared (IR) spectroscopy, Raman spectroscopy and thermogravimetric analysis confirmed the successful functionalization of the SWCNTs. SWCNT-SH powders exhibited a threefold higher adsorption capacity for Hg(II) ions compared to pristine SWCNTs, and a fourfold higher adsorption capacity compared to activated carbon. The influence of adsorption time, pH, initial metal concentration and adsorbent dose on Hg(II) ion removal was investigated. The maximum adsorption capacity of the SWCNT-SH powders was estimated by using equilibrium isotherms, such as Freundlich and Langmuir, and the maximum adsorption capacity of the SWCNT-SH powder was found to be 131. mg/g. A first-order rate model was employed to describe the kinetic adsorption process of Hg(II) ions onto the SWCNT-SH powders. Desorption studies revealed that Hg(II) ions could be easily removed from the SWCNT-SH powders by altering the pH. Further, the adsorption efficiency of recovered SWCNT-SH powders was retained up to 91%, even after 5 adsorption/desorption cycles.
AB - Thiol-derivatized single walled carbon nanotube (SWCNT-SH) powders were synthesized by reacting acid-cut SWCNTs with cysteamine hydrochloride using carbodiimide coupling. Infrared (IR) spectroscopy, Raman spectroscopy and thermogravimetric analysis confirmed the successful functionalization of the SWCNTs. SWCNT-SH powders exhibited a threefold higher adsorption capacity for Hg(II) ions compared to pristine SWCNTs, and a fourfold higher adsorption capacity compared to activated carbon. The influence of adsorption time, pH, initial metal concentration and adsorbent dose on Hg(II) ion removal was investigated. The maximum adsorption capacity of the SWCNT-SH powders was estimated by using equilibrium isotherms, such as Freundlich and Langmuir, and the maximum adsorption capacity of the SWCNT-SH powder was found to be 131. mg/g. A first-order rate model was employed to describe the kinetic adsorption process of Hg(II) ions onto the SWCNT-SH powders. Desorption studies revealed that Hg(II) ions could be easily removed from the SWCNT-SH powders by altering the pH. Further, the adsorption efficiency of recovered SWCNT-SH powders was retained up to 91%, even after 5 adsorption/desorption cycles.
KW - Adsorption
KW - Desorption
KW - Mercury
KW - Nanomaterials
KW - Single walled carbon nanotube
KW - Thiol
UR - http://www.scopus.com/inward/record.url?scp=84883213824&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2013.07.076
DO - 10.1016/j.jhazmat.2013.07.076
M3 - Article
C2 - 23994651
AN - SCOPUS:84883213824
SN - 0304-3894
VL - 261
SP - 534
EP - 541
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -