Removal of mercury from water by multi-walled carbon nanotubes

B. Tawabini, S. Al-Khaldi, Muataz Atieh, M. Khaled

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

The removal of mercury (Hg2+) ions from contaminated water using multiwalled carbon nanotubes (MWCNTs) was investigated in this study. Results of the study showed that MWCNTs slurry was very efficient in removing as high as 1.0 mg/L of Hg2+ from aqueous solutions via the adsorption mechanism. This removal efficiency was found to be a function of the aqueous pH level, dosage of CNTs, mixing rate, and contact time. The study showed that the Hg uptake by MWCNTs increased to 100% with an increase in pH from pH 4 to 8. The results also showed that higher dosage of MWCNTs, showed higher removal of Hg2+. In a 50mL water sample, 10mg of MWCNTs was needed to remove all of the 0.1 mg/L of Hg2+ ions. On the other hand, increasing the mixing rate from 50 to 150 rpm improved the removal efficiency. The experimental results also showed that mercury adsorption by MWCNTs follow a pseudo second-order reaction with a rate (k) of 0.018 and it is well described by the Langmuir isotherm model with maximum adsorptive capacity (qmax) of 13.16.

Original languageEnglish
Pages (from-to)591-598
Number of pages8
JournalWater Science and Technology
Volume61
Issue number3
DOIs
Publication statusPublished - 2010
Externally publishedYes

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Keywords

  • Carbon nanotubes (cnts)
  • Heavy metals
  • Mercury
  • Water treatment

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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