title: Facile preparation of raisin-bread sandwich-structured magnetic graphene/mesoporous silica composites with C18-modified pore-walls for efficient enrichment of phthalates in environmental water.
abstract: In this study, novel raisin-bread sandwich-structured magnetic graphene/mesoporous silica composites with C18-modified interior pore-walls (mag-graphene@mSiO2-C18) were synthesized by coating mesoporous silica layers onto each side of magnetic graphene through a surfactant-mediated co-condensation sol-gel process. The prepared functionalized nanocomposites possessed marvelous properties of extended plate-like morphology, fine water dispersibility, high magnetic response, large surface area (315.4cm(2)g(-1)), uniform pore size (3.3nm) and C18-modified interior pore-walls. Several kinds of phthalates were selected as model analytes to systematically evaluate the performance of adsorbents in extracting hydrophobic molecules followed by gas chromatography-mass spectrometry analyses. Various extraction parameters, including pH value of sample solution, amounts of adsorbents, adsorption time, species and volume of eluting solvent, and desorption time were optimized. The anti-interference ability to macromolecular proteins was also investigated. Method validations such as linearity, recovery, reproducibility, and limit of detection were also studied. Finally, mag-graphene@mSiO2-C18 composites were successfully applied to analyzing phthalates in environmental water samples. The results indicated that this novel approach offered an attractive alternative for rapid, convenient, efficient and selective magnetic solid-phase extraction for targeted hydrophobic compounds.
authors.affiliation: Department of Chemistry, Fudan University, Shanghai 200433, China.
authors.forename: Danni
authors.initials: D
authors.lastname: Huang
authors.affiliation: Department of Chemistry, Fudan University, Shanghai 200433, China.
authors.forename: Xianying
authors.initials: X
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Fudan University, Shanghai 200433, China. Electronic address: chdeng@fudan.edu.cn.
authors.forename: Chunhui
authors.initials: C
authors.lastname: Deng
authors.affiliation: Research Center of Analysis and Measurement, Fudan University, Shanghai 200433, China; State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Guoxin
authors.initials: G
authors.lastname: Song
authors.affiliation: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Hefa
authors.initials: H
authors.lastname: Cheng
authors.affiliation: Department of Chemistry, Fudan University, Shanghai 200433, China.
authors.forename: Xiangmin
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D008401:Gas Chromatography-Mass Spectrometry / Q000295:instrumentation* / Q000379:methods; D006108:Graphite / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D060526:Magnetic Fields; D053761:Nanocomposites / Q000737:chemistry; D010795:Phthalic Acids / Q000032:analysis*; D016062:Porosity; D015203:Reproducibility of Results; D012822:Silicon Dioxide / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D010795:Phthalic Acids; D014874:Water Pollutants, Chemical; C032279:phthalic acid; D012822:Silicon Dioxide; D006108:Graphite
keywords: Environmental water; Functional mesoporous silica; Gas chromatography–mass spectrometry; Magnetic graphene; Micro solid-phase extraction; Phthalates