Samplers for VOCs in air based on cyclodextrin–silica hybrid microporous solid phases

Abstract

Samplers for VOCs in air based on cyclodextrin-silica hybrid microporous solid phases are proposed. The solid phase preparation is very easy and inexpensive. Proposed samplers compared with other solid phases present the advantages of a wider range of operative conditions for VOCs desorption. Samplers are tested based on results for the determination of benzene, toluene, ethylbenzene and o-xylene, m-xylene and p-xylene (BTEX) in air. Operational parameters are optimized and quantitative recovery is obtained using a solid phase from 2-hydroxypropyl-β-cyclodextrin and acetonitrile as the extraction solvent. The recoveries obtained are 89 ± 4%, 90 ± 6%, 91 ± 2%, 87.0 ± 0.9%, 88 ± 4%, and 88 ± 4% for benzene, toluene, ethylbenzene, o-xylene, m-xylene and p-xylene, respectively. Moreover results indicate a good reproducibility with a coefficient of variation below 6% and no significant difference between the reproducibility intra-synthesis and inter-synthesis. The proposed procedure has been applied to the determination of BTEX in several contaminated air samples and compared with results provided by a reference method.

Do Cyclodextrins Encapsulate Volatiles in Deep Eutectic Systems?

“…9 βCD-based materials have been reported to be efficient in inclusion complex formation towards several organic pollutants. 2,3,5,6,[10][11][12][13][14] Deep Eutectic Systems (DES) have been recently suggested as innovative materials with potential in gas absorption. [15][16][17][18] Practically speaking, a DES is the result of the combination in the proper ratio of an opportune hydrogen-bond donor (HBD) and a hydrogen-bond acceptor (HBA).…”

Evaluation of a Cyclodextrin-silica Hybrid Microporous Composite for the Solid-phase Extraction of Polycyclic Aromatic Hydrocarbons

“…31 The stoichiometry of theses materials, which can incorporate a diversity of cyclodextrin in variable amounts, corresponds to the general formula (CD)xSiO1.5(OH)0.5·0.7H2O, where the x value depends (among other parameters) on the cyclodextrin type (x = 0.0007, 0.0013 and 0.0016, for solids containing β-cyclodextrin, 2-hydroxypropyl-β-cyclodextrin and γ-cyclodextrin, respectively). A preliminary part in the present work concerned cyclodextrin selection.…”

“…Moreover, NMR studies confirmed that no 2-hydroxypropyl-β-cyclodextrin degradation occurred under the preparative working conditions. 31 Nanopure water from a Brastead purification system was employed. A Vac Elut 20 connected to a diaphragm vacuum pump (CKNF Model N 0.26.3 AN 18) was employed to treat the samples.…”

“…30 Recently, we designed samplers for determining volatile organic compounds in air samples based on the use of a solid-phase containing immobilized cyclodextrin. 31 The aim of this work is to study the potential uses of these type of solid phases as fillers of solid-extraction cartridges for the isolation and preconcentration of organic contaminants in water samples by SPE.…”

Molecular entrapment of volatile organic compounds (VOCs) by electrospun cyclodextrin nanofibers

“…Some molecules that CD form IC can be hazardous and polluting chemicals, so CDs are fairly useful for filtration/separation/purification areas (Olah et al, 1988;Crini and Morcellet, 2002;Landy et al, 2012;Morin-Crini and Crini, 2013;Schofield et al, 2012). For this purpose, it can be considered that, CD have also potential for the elimination of VOCs from the environment (Favier et al, 2011;Mauri-Aucejo et al, 2012). However, during the use of powder and cross-linked polymeric granular form of CD, handling and reusability appear as challenge which restricts their potential.…”