Development of magnetic graphene @hydrophilic polydopamine for the enrichment and analysis of phthalates in environmental water samples

• Published in: Talanta (Oxford) 2015-01, Vol.132, p.753-759
• Main Authors: Wang, Xianying, Song, Guoxin, Deng, Chunhui
• Format: Article
• Language: English
• Subjects: Adsorption; Ambient water; Fresh Water - chemistry; Gas Chromatography-Mass Spectrometry; Graphite - chemistry; Hydrogen-Ion Concentration; Hydrophobic and Hydrophilic Interactions; Indoles - chemistry; Limit of Detection; Magnetic graphene@polydopamine; Magnetic solid-phase extraction; Magnets; Phthalates; Phthalic Acids - analysis; Polymers - chemistry; Solid Phase Extraction; Water Pollutants, Chemical - analysis
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2014.10.014

Magnetic graphene @hydrophilic polydopamine composites were successfully fabricated via a simple solvothermal reaction and self-polymerization of dopamine. Benefit from the excellent characteristics of strong magnetic responsivity, super-hydrophilicity and abundant π-electron system, the prepared material showed great potential as a magnetic solid phase extraction (MSPE) sorbent. In this work, six kinds of phthalates (PAEs) were selected as the target analytes to evaluate the extraction ability of the adsorbents combined with MSPE-GC–MS. And various extraction parameters were optimized by selecting the pH value of samples, the amount of sorbents, adsorption and desorption time, the type and volume of eluting solution. Meanwhile, the whole extraction process could be finished in 30min. Under the optimized conditions, validations of the method were evaluated as well. And the results presented excellent linearity with a wide range of 50–20,000μg/L (R2>0.9991). The detection of limits were in the range from 0.05–5μg/L (S/N=3). Therefore, the novel magnetic graphene@polydopamine composites were successfully used as the sorbents for the enrichment and analysis of PAEs in real water samples. This proposed method provided a simple, efficient and sensitive approach for the determination of aromatic compounds in real environmental samples. Herein, magnetic graphene @hydrophilic polydopamine composites were successfully fabricated via a simple solvothermal reaction and self-polymerization of dopamine, and the composites were applied to enrichment and analysis of phthalates in water samples. [Display omitted] •Novel preparation of magnetic graphene coated with polydopamine was proposed.•Mag-graphene@PDA was applied as the SPE sorbent for extraction of phthalates in water samples.•The extraction parameters were systematically investigated.•Under the optimized conditions, the method showed good linearity and precision.•The proposed method was successfully used for enrichment of the target analytes in real water samples.