Graphene-based solid-phase extraction disk for fast separation and preconcentration of trace polycyclic aromatic hydrocarbons from environmental water samples

Abstract

Graphene has great potentials for the use in sample preparation due to its ultra high specific surface area, superior chemical stability, and excellent thermal stability. In our work, a novel graphene-based SPE disk was developed for separation and preconcentration of trace polycyclic aromatic hydrocarbons from environmental water samples. Based on the strong π-π stacking interaction between the analytes and graphene, the analytes extracted by graphene were eluted by cyclohexane and then determined by GC-MS. Under the optimized conditions, high flow rate (30 mL/min) and sensitivity (0.84-13 ng/L) were achieved. The proposed method was successfully applied to the analysis of real environmental water samples with recoveries ranging from 72.8 to 106.2%. Furthermore, the property of anticlogging and reusability was also improved. This work reveals great potentials of graphene-based SPE disk in environmental analytical.

Amphoteric surfactant promoted three-dimensional assembly of graphene micro/nanoclusters to accomodate Pt nanoparticles for methanol oxidation

“…1. Firstly, graphite oxide (GO) negatively charged were synthesized by a modified Hummers method [9]. Afterwards, the amphoteric surfactant which is positively charged in aqueous solution was added into GO suspension, in which the lamellar spacing of GO could be expanded with the surfactant intercalation via electrostatic interplay.…”

Magnetic N-doped carbon nanotubes: A versatile and efficient material for the determination of polycyclic aromatic hydrocarbons in environmental water samples

“…However, due to the very hydrophobic nature, these carbon nanostructures strongly agglomerate in water hindering the PAH adsorption processes. Several attempts to fix the carbon nanostructures in different supports have been investigated such as graphene-based SPE disk [14], CNT supported on stainless steel fiber [15] and on a sol-gel material [16].…”

Solid-phase extraction using bis(indolyl)methane-modified silica reinforced with multiwalled carbon nanotubes for the simultaneous determination of flavonoids and aromatic organic acid preservatives

“…One of the most important factors of the SPE-based method is the extraction properties of the sorbent material, which dominates multiple analytical parameters such as selectivity, affinity, and adsorption capacity [6]. Thus, the development of SPE technique usually focuses on the investigation of novel sorbent materials and procedures.…”