Pharmaceuticals Removal by Adsorption with Montmorillonite Nanoclay

The problem of purifying domestic and hospital wastewater from pharmaceutical compounds is becoming more and more urgent every year, because of the continuous accumulation of chemical pollutants in the environment and the limited availability of freshwater resources. Clay adsorbents have been repeat...

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Bibliographic Details
Published in:International journal of molecular sciences 2021-09, Vol.22 (18), p.9670
Main Authors: Kryuchkova, Marina, Batasheva, Svetlana, Akhatova, Farida, Babaev, Vasily, Buzyurova, Daina, Vikulina, Anna, Volodkin, Dmitry, Fakhrullin, Rawil, Rozhina, Elvira
Format: Article
Language:English
Subjects:
Activated carbon
Adsorbates
Adsorbents
Adsorption
Ammonium
Analgesics
Carbamazepine
clay minerals
Efficiency
Equilibrium
Hydrophobicity
Ibuprofen
Medical wastes
Montmorillonite
Nonsteroidal anti-inflammatory drugs
Paracetamol
Pharmaceutical industry
Pharmaceuticals
Pollutants
Surfactants
treatment effectiveness
Wastewater
Water treatment
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Summary:The problem of purifying domestic and hospital wastewater from pharmaceutical compounds is becoming more and more urgent every year, because of the continuous accumulation of chemical pollutants in the environment and the limited availability of freshwater resources. Clay adsorbents have been repeatedly proposed as adsorbents for treatment purposes, but natural clays are hydrophilic and can be inefficient for catching hydrophobic pharmaceuticals. In this paper, a comparison of adsorption properties of pristine montmorillonite (MMT) and montmorillonite modified with stearyl trimethyl ammonium (hydrophobic MMT-STA) towards carbamazepine, ibuprofen, and paracetamol pharmaceuticals was performed. The efficiency of adsorption was investigated under varying solution pH, temperature, contact time, initial concentration of pharmaceuticals, and adsorbate/adsorbent mass ratio. MMT-STA was better than pristine MMT at removing all the pharmaceuticals studied. The adsorption capacity of hydrophobic montmorillonite to pharmaceuticals decreased in the following order: carbamazepine (97%) > ibuprofen (95%) > paracetamol (63–67%). Adsorption isotherms were best described by Freundlich model. Within the pharmaceutical concentration range of 10–50 µg/mL, the most optimal mass ratio of adsorbates to adsorbents was 1:300, pH 6, and a temperature of 25 °C. Thus, MMT-STA could be used as an efficient adsorbent for deconta×ating water of carbamazepine, ibuprofen, and paracetamol.
ISSN:1422-0067
1661-6596
1422-0067
DOI:10.3390/ijms22189670