Oxidized multiwalled carbon nanotubes as adsorbent for the removal of manganese from aqueous solution

Pandian Ganesan, Ramakrishnan Kamaraj, Ganapathy Sozhan, Subramanyan Vasudevan

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

A batch adsorption process was applied to investigate the removal of manganese from aqueous solution by oxidized multiwalled carbon nanotubes (MWCNTs). In doing so, the thermodynamic, adsorption isotherm, and kinetic studies were also carried out. MWCNT with 5-10-nm outer diameter, surface area of 40-600 m2/g, and purity above 95 % was used as an adsorbent. A systematic study of the adsorption process was performed by varying pH, ionic strength, and temperature. Manganese-adsorbed MWCNT was characterized by Raman, FTIR, X-ray diffraction, XPS, SEM, and TEM. The adsorption efficiency could reach 96. 82 %, suggesting that MWCNT is an excellent adsorbent for manganese removal from water. The results indicate that second-order kinetics model was well suitable to model the kinetic adsorption of manganese. Equilibrium data were well described by the typical Langmuir adsorption isotherm. Thermodynamic studies revealed that the adsorption reaction was spontaneous and endothermic process. The experimental results showed that MWCNT is an excellent manganese adsorbent. The MWCNTs removed the manganese present in the water and reduced it to a permissible level making it drinkable.

Original languageEnglish
Pages (from-to)987-996
Number of pages10
JournalEnvironmental Science and Pollution Research
Volume20
Issue number2
DOIs
Publication statusPublished - Feb 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

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