Photocatalysis of γ–cyclodextrin-functionalised Fe3O4 nanoparticles for degrading Bisphenol A in polluted waters
Mariana Neamţu A , Claudia Nădejde
A E , Vasile-Dan Hodoroabă B , Rudolf J. Schneider B , Gabriel Ababei C and Ulrich Panne B D
+ Author Affiliations
- Author Affiliations
A ‘Alexandru Ioan Cuza’ University of Iasi, Institute for Interdisciplinary Research – Science Research Department, Lascar Catargi Str. 54, 700107 Iasi, Romania.
B Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany.
C National Institute of Research and Development for Technical Physics, Dimitrie Mangeron Bd. 47, 700050 Iasi, Romania.
D Humboldt-Universität zu Berlin, Germany, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
E Corresponding author. Email: claudia.nadejde@uaic.ro
Environmental Chemistry 16(2) 125-136 https://doi.org/10.1071/EN18181
Submitted: 31 August 2018 Accepted: 19 December 2018 Published: 5 February 2019
Environmental context. Efficiently removing persistent organic pollutants, such as Bisphenol A, from wastewaters is essential for maintaining environmental quality. The present work applies advanced oxidation processes and the enhanced photocatalytic activity of cyclodextrin-immobilised magnetic nanoparticles for the removal of Bisphenol A under mild conditions. The study highlights the need to consider eco-friendly, safe and cost-effective approaches for the removal of persistent hazardous pollutants from wastewaters.
Abstract. The efficiency, relatively low cost and eco-friendly nature of hydrogen peroxide-assisted photocatalysis treatment procedures are significant advantages over conventional techniques for wastewater remediation. Herein, we evaluate the behaviour of γ-cyclodextrin (γ-CD) immobilised on either bare or chitosan (CS)–functionalised Fe3O4 nanoparticles, for photodegrading Bisphenol A (BPA) in ultrapure water and in real wastewater samples. The BPA removal efficiencies with Fe3O4/γ-CD and Fe3O4/CS/γ-CD were compared with those of Fe3O4/β-CD, and were monitored under UVA irradiation at near-neutral pH. The addition of H2O2 at low concentrations (15 mmol L−1) significantly increased BPA photodegradation in the presence of each nanocomposite. The highest catalytic activity was shown by both Fe3O4/γ-CD and Fe3O4/CS/γ-CD nanocomposites (~60 and 27 % BPA removal in ultrapure water and real wastewater effluent, respectively). Our findings reveal the superior performance of γ-CD-functionalised Fe3O4 relative to that of Fe3O4/β-CD. The use of CD-based nanocomposites as photocatalytic materials could be an attractive option in the pre- or post-treatment stage of wastewaters by advanced oxidation processes before or after biological treatment.
Additional keywords : photooxidation, sonochemical synthesis, wastewater.
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