Using recyclable magnetic carbon nanotube to remove micropollutants from aqueous solutions

Magnetic carbon nanotubes (MCNs) were synthesized using a new hydrothermal method. The new developed MCNs were evaluated for removal of Metolachlor, Bisphenol-A, Tonalide, Triclosan, Ketoprofen and Estriol from aqueous solutions. Using response surface methodology, a predicting removal model was dev...

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Bibliographic Details
Published inJournal of molecular liquids Vol. 249; pp. 193 - 202
Main Authors Alizadeh Fard, Mohammad, Barkdoll, Brian
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.01.2018
Subjects
Adsorbent restoration
Adsorption
Emerging contaminants
Magnetic carbon nanotube
Adsorption
Magnetic carbon nanotube
Adsorbent restoration
Emerging contaminants
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Summary:Magnetic carbon nanotubes (MCNs) were synthesized using a new hydrothermal method. The new developed MCNs were evaluated for removal of Metolachlor, Bisphenol-A, Tonalide, Triclosan, Ketoprofen and Estriol from aqueous solutions. Using response surface methodology, a predicting removal model was developed based on solution pH, contact time, adsorbate concentration and adsorbent dose. Experimental results showed high agreement with the predicted ones at optimum conditions. In addition, experimental results were modeled by Freundlich and Langmuir isotherms, which directed a better fit to the Langmuir isotherm. MCN presented good adsorption capacity in which Bisphenol-A, Ketoprofen and Tonalide were the most effectively removed micropollutants, with 98, 96 and 96% removal within 47min, respectively. Thermodynamic studies showed that the adsorption process was endothermic and spontaneous for the micropollutants. Adsorbate regeneration studies were done with methanol, ethanol, HCl, NaOH and hydrogen peroxide in five regenerating cycles. Methanol had the highest level of adsorbent recovery. MCN can be used as a sustainable adsorbent for adsorption of the studied micropollutants. [Display omitted] •Magnetic carbon nanotubes (MCN) were synthesized using a new hydrothermal method.•MCN adsorbed more than 92% of the studied micropollutants.•Prediction models were developed for the adsorption of the tested adsorbates.•Methanol regeneration experiments ensured recyclability of the adsorbent.
ISSN:0167-7322
1873-3166
DOI:10.1016/j.molliq.2017.11.039