Enhanced adsorption of mercury ions on thiol derivatized single wall carbon nanotubes

Narasimha Bandaru, Nekane Reta, MD Dalal, Amanda Ellis, Joseph Shapter, Nicolas Voelcker

    Research output: Contribution to journalArticle

    107 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)534-541
    Number of pages8
    JournalJournal of Hazardous Materials
    Volume261
    DOIs
    Publication statusPublished - 5 Oct 2013

    Keywords

    • Adsorption
    • Desorption
    • Mercury
    • Nanomaterials
    • Single walled carbon nanotube
    • Thiol

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