Cyclodextrin-functionalized mesostructured silica nanoparticles for removal of polycyclic aromatic hydrocarbons
Date
2017Source Title
Journal of Colloid and Interface Science
Print ISSN
0021-9797
Electronic ISSN
1095-7103
Publisher
Academic Press Inc.
Volume
497
Pages
233 - 241
Language
English
Type
ArticleItem Usage Stats
211
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353
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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.
Keywords
CyclodextrinMesostructured 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
Permalink
http://hdl.handle.net/11693/37369Published Version (Please cite this version)
http://dx.doi.org/10.1016/j.jcis.2017.03.015Collections
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