Cyclodextrin-functionalized mesostructured silica nanoparticles for removal of polycyclic aromatic hydrocarbons

Date
2017
Authors
Topuz, F.
Uyar, T.
Advisor
Instructor
Source Title
Journal of Colloid and Interface Science
Print ISSN
0021-9797
Electronic ISSN
1095-7103
Publisher
Academic Press Inc.
Volume
497
Issue
Pages
233 - 241
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

Polycyclic aromatic hydrocarbons (PAHs) are the byproducts of the incomplete combustion of carbon-based fuels, and have high affinity towards DNA strands, ultimately exerting their carcinogenic effects. They are ubiquitous environmental contaminants, and can accumulate on tissues due to their lipophilic nature. In this article, we describe a novel concept for PAH removal from aqueous solutions using cyclodextrin-functionalized mesostructured silica nanoparticles (CDMSNs) and pristine mesostructured silica nanoparticles (MSNs). The adsorption applications of MSNs are greatly restricted due to the absence of surface functional groups on such particles. In this regard, cyclodextrins can serve as ideal functional molecules with their toroidal, cone-type structure, capable of inclusion-complex formation with many hydrophobic molecules, including genotoxic PAHs. The CDMSNs were synthesized by the surfactant-templated, NaOH-catalyzed condensation reactions of tetraethyl orthosilicate (TEOS) in the presence of two different types of cyclodextrin (i.e. hydroxypropyl-β-cyclodextrin (HP-β-CD) and native β-cyclodextrin (β-CD)). The physical incorporation of CD moieties was supported by XPS, FT-IR, NMR, TGA and solid-state 13C NMR. The CDMSNs were treated with aqueous solutions of five different PAHs (e.g. pyrene, anthracene, phenanthrene, fluorene and fluoranthene). The functionalization of MSNs with cyclodextrin moieties significantly boosted the sorption capacity (q) of the MSNs up to ∼2-fold, and the q ranged between 0.3 and 1.65 mg per gram CDMSNs, of which the performance was comparable to that of the activated carbon.

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Keywords
Cyclodextrin, Mesostructured silica nanoparticles (MSN), Polycyclic aromatic hydrocarbons (PAH), Water treatment, Activated carbon, Activated carbon treatment, Adsorption, Anthracene, Aromatic compounds, Aromatic hydrocarbons, Aromatization, Byproducts, Condensation reactions, Cyclodextrins, Hydrocarbons, Molecules, Nanoparticles, Silica, Solutions, Water treatment, Environmental contaminant, Hydrophobic molecules, Incomplete combustion, Mesostructured silica, Polycyclic aromatic hydrocarbon (PAH), Polycyclic aromatic hydrocarbons (PAHS), Surface functional groups, Tetraethyl orthosilicates, Polycyclic aromatic hydrocarbons, Anthracene, Beta cyclodextrin, Cyclodextrin, Fluoranthene, Fluorene, Phenanthrene, Polycyclic aromatic hydrocarbon, Pyrene, Silica nanoparticle, Tetraethoxysilane, Cyclodextrin, Metal nanoparticle, Polycyclic aromatic hydrocarbon, Silicon dioxide, Adsorption, Aqueous solution, Article, Carbon nuclear magnetic resonance, Chemical structure, Complex formation, Hydrophobicity, Infrared spectroscopy, Nuclear magnetic resonance, Polymerization, Priority journal, Thermogravimetry, Water treatment, Chemistry, Isolation and purification, Adsorption, Cyclodextrins, Metal nanoparticles, Polycyclic aromatic hydrocarbons, Silicon dioxide
Citation
Published Version (Please cite this version)