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Removal of Noxious Cr (Vi) Ions Using Single-Walled Carbon Nanotubes and Multi-Walled Carbon Nanotubes Publisher



Dehghani MH1, 2 ; Taher MM1 ; Bajpai AK3 ; Heibati B1, 4 ; Tyagi I5 ; Asif M6 ; Agarwal S5 ; Gupta VK5, 7, 8
Authors
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Authors Affiliations
  1. 1. Tehran University of Medical Sciences, School of Public Health, Department of Environmental Health Engineering, Tehran, Iran
  2. 2. Institute for Environmental Research, Center for Solid Waste Research, Tehran, Iran
  3. 3. Bose Memorial Research Laboratory, Department of Chemistry, Government Autonomous Science College, Jabalpur, 482001, India
  4. 4. Health Science Research Center, Faculty of Health, Mazandaran University of Medical Sciences, Sari, Iran
  5. 5. Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
  6. 6. Department of Chemical Engineering, King Saud University, Riyadh, Saudi Arabia
  7. 7. Center for Environment and Water, The Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia
  8. 8. Department of Applied Chemistry, University of Johannesburg, Johannesburg, South Africa

Source: Chemical Engineering Journal Published:2015


Abstract

The adsorption capacity of two efficient adsorbents namely MWCNTs and SWCNTs for the rapid removal of noxious Cr (VI) ion from the polluted aqueous source was well studied and investigated. The impact of several influential parameters such as contact time, initial pH, initial Cr (VI) ion concentrations and the adsorption capacity of the adsorbent in the presence of competing anion was well elucidated and optimized. It was observed that the removal of efficiency of Cr (VI) ion depends on the pH of solution and the maximum efficiency was noticed at pH 2.5. Furthermore, the uptake of Cr (VI) ion was hindered in the presence of the competing anion, SO42-. Experimental equilibrium data were fitted to four different isotherm models by linear regression method, however, the adsorption equilibrium data were well interpreted by the Langmuir model. The maximum adsorption capacity of Cr (VI) ion by MWCNTs and SWCNTs was 1.26 and 2.35mg/g respectively, which is calculated by the Langmuir isotherm model. Kinetic studies are well suited and found in good agreement with pseudo-second order. The results evidently indicated that MWCNTs and SWCNTs would be suitable adsorbents for Cr (VI) ion in wastewater under specific conditions. © 2015 Elsevier B.V.
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