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Continuous Removal of Toxic Nickel From Industrial Wastewater by Flotation-Adsorption With Multi-Walled Carbon Nanotubes: Kinetic and Adsorption Isotherms Publisher



Dehghani MH1, 2 ; Karimi B1, 3 ; Rafieepour A4
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Institute for Environmental Research, Center for Solid Waste Research, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Department of Environmental Health Engineering, School of Health, Arak University of Medical Sciences, Arak, Iran
  4. 4. School of Public health, Students’ research office, Shahid Beheshti University of Medical Science, Tehran, Iran

Source: Desalination and Water Treatment Published:2017


Abstract

Nickel is a toxic metal ion present in industrial wastewater. In this study, ion flotation combined with multi-walled carbon nanotubes (MWCNTs) adsorbent experiments was performed to investigate the removal of nickel ions from aqueous solution. Various parameters such as aeration time, sodium dodecyl sulfate and MWCNTs concentrations, pH, surfactant, frother concentrations and airflow rate were tested to determine the optimum flotation conditions. Sodium dodecyl sulfate was used as collectors. Ethanol was used as frother. In the airflow of 150 mL/min and after 5, 15, 30, 60, 90 and 120 min of ion flotation with MWCNTs adsorbent, the efficiency of nickel removal was 14%, 24%, 33%, 38%, 44% and 48%, respectively. The maximum reduction in the concentration of nickel occurs at 30 mg/L concentration (with removal efficiency of 71.7%). This method reduces the time to reach equilibrium point and increases the minimum concentration to adsorb. The results show that the combination of ion flotation method and adsorption with MWCNT works well for reduction in the concentrations of compounds such heavy metal ions. © 2017 Desalination Publications. All rights reserved.
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