title: β-cyclodextrin functionalized meso-/macroporous magnetic titanium dioxide adsorbent as extraction material combined with gas chromatography-mass spectrometry for the detection of chlorobenzenes in soil samples.
abstract: A high-performance and selective adsorbent was developed for simultaneous extraction of 6 chlorobenzenes residues in soil samples by using magnetic solid phase extraction (MSPE) combined with automated SPE followed by gas chromatography-mass spectrometry (GC-MS). The adsorbent was synthesized by grafting carboxymethyl-β-cyclodextrin (CM-β-CD) on the surface of porous core-shell magnetic Fe3O4@flower like TiO2 microspheres (Fe3O4@fTiO2-CMCD), used as a carrier. The main factors (adsorbent amount, adsorption time, elution solvent, elution volume, and elution flow rate) affecting the extraction efficiency were investigated in detail. The adsorbent exhibited high loading capacity (25.6 mg g(-1) for 1,3-dichlorobenzene). This maybe due to meso-/macroporous TiO2 having high specific surface area; as a carrier of the β-cyclodextrin film, it could obviously increase the number of recognition sites. The newly developed adsorbent also showed good selectivity towards chlorobenzenes based on host-guest interactions between β-cyclodextrin (on adsorbent's surface) and targets, which can minimize complex matrix interference in soil samples. The proposed method was successfully applied for the analysis of environmental soil samples with recovery ranging from 87.3 to 104.3%. All target compounds showed good linearities with correlation coefficients (r) higher than 0.996. The limits of quantitation for the 6 CBs were 0.03-0.09 μg kg(-1). These findings confirmed meso-/macroporous structure Fe3O4@fTiO2-CMCD as a highly effective extraction material for use in trace CB analyses in complex soil samples.
authors.affiliation: Faculty of Materials Science and Chemical Engineering, Ningbo University, 315211, China.
authors.forename: Jiabin
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Faculty of Materials Science and Chemical Engineering, Ningbo University, 315211, China. Electronic address: ganning@nbu.edu.cn.
authors.forename: Ning
authors.initials: N
authors.lastname: Gan
authors.affiliation: Faculty of Marine Science, Ningbo University, Ningbo 315211, China.
authors.forename: Si
authors.initials: S
authors.lastname: Chen
authors.affiliation: Faculty of Materials Science and Chemical Engineering, Ningbo University, 315211, China.
authors.forename: Muyun
authors.initials: M
authors.lastname: Pan
authors.affiliation: Faculty of Materials Science and Chemical Engineering, Ningbo University, 315211, China.
authors.forename: Dazhen
authors.initials: D
authors.lastname: Wu
authors.affiliation: Faculty of Materials Science and Chemical Engineering, Ningbo University, 315211, China.
authors.forename: Yuting
authors.initials: Y
authors.lastname: Cao
mesh_terms: D000327:Adsorption; D002722:Chlorobenzenes / Q000032:analysis*; D004784:Environmental Monitoring; D008401:Gas Chromatography-Mass Spectrometry; D060328:Magnetic Phenomena; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D052616:Solid Phase Extraction / Q000379:methods*; D014025:Titanium / Q000737:chemistry*; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D002722:Chlorobenzenes; D012987:Soil; D012989:Soil Pollutants; D047392:beta-Cyclodextrins; C441457:carboxymethyl-beta-cyclodextrin; C009495:titanium dioxide; D014025:Titanium; C031294:chlorobenzene
keywords: Automated solid-phase extraction; Carboxymethyl-β-cyclodextrin; Chlorobenzene; Magnetic solid phase extraction; Matrix interference; Meso-/macroporous