title: Hierarchical Graphene coating for highly sensitive solid phase microextraction of organochlorine pesticides.
abstract: Graphene, a novel class of carbon nanostructures, has received great attention as sorbents due to its fascinating structures, ultrahigh specific surface area, and good extraction ability. In this paper, a new type of hierarchical graphene was synthesized through employing a mild and environment-friendly method. Such 3D interconnected graphene own a high specific surface area up to 524m(2)g(-1), which is about 2.5 fold larger than the graphene, since the synthetic material has interlayer pores between nanosheets and in-plane pores. Then a superior solid-phase microextraction fiber was fabricated by sequentially coating the stainless steel fiber with silicone sealant film and hierarchical graphene powder. Since the novel hierarchical graphene possessed large surface area and good adsorption property, the as-prepared fiber exhibited good extraction properties of the organochlorine pesticides (OCPs). As for the analytical performance, the as-prepared fiber achieved low detection limits (0.08-0.80ngL(-1)) and wide linearity (10-30,000ngL(-1)) under the optimal conditions. The repeatability (n=5) for single fiber were between 5.1% and 11%, while the reproducibility (n=3) of fiber-to-fiber were range from 6.2% to14%. Moreover, the fiber was successfully applied to the analysis of OCPs in the Pearl River water.
authors: MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors: Fuxin
authors: F
authors: Wang
authors: MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors: Shuqin
authors: S
authors: Liu
authors: MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors: Hao
authors: H
authors: Yang
authors: MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors: Juan
authors: J
authors: Zheng
authors: MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors: Junlang
authors: J
authors: Qiu
authors: MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors: Jianqiao
authors: J
authors: Xu
authors: MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China.
authors: Yexiang
authors: Y
authors: Tong
authors: MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China. Electronic address: ceszhuf@mail.sysu.edu.cn.
authors: Fang
authors: F
authors: Zhu
authors: MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, PR China. Electronic address: cesoygf@mail.sysu.edu.cn.
authors: Gangfeng
authors: G
authors: Ouyang
mesh_terms: D002681:China; D004784:Environmental Monitoring; D006108:Graphite / Q000737:chemistry*; D006843:Hydrocarbons, Chlorinated / Q000032:analysis* / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D010575:Pesticides / Q000032:analysis* / Q000737:chemistry; D056951:Photoelectron Spectroscopy; D045483:Rivers / Q000737:chemistry; D012828:Silicones / Q000737:chemistry; D052617:Solid Phase Microextraction / Q000295:instrumentation; D013059:Spectrum Analysis, Raman; D013193:Stainless Steel / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D012828:Silicones; D014874:Water Pollutants, Chemical; D013193:Stainless Steel; D006108:Graphite
keywords: Gas chromatography-mass spectrometry; Hierarchical graphene; Organochlorine pesticides; Solid-phase microextraction