Application of Single Wall Carbon Nanotube-Wrapped Silica Composite Adsorbents as a Solid Phase Extraction Material to Measure Organophosphorus Pesticides in Water

In this paper, single wall carbon nanotube (SWCNT) suspensions were added dropwise to silica particles before volatising the solvent to prepare a core-shell composite adsorbent with SWCNTs wrapped around silica particles (SWCNTs@Silica). The composite adsorbent was used as packing for the solid phase extraction (SPE) and the enrichment of organophosphorus pesticides (OPPs) in water. The results indicate the SWCNTs entirely wrap the silica particle surfaces to form SWCNT shells. This preparation method is simpler and more efficient than existing methods. SWCNTs@Silica composite materials can reduce the number of SWCNTs required and improve their utilisation. The extraction capacity for OOPs in water was higher than for C18 but below HLB. The developed SPE-GC-FPD method exhibited a limit of detection (LOD) and limit of quantitation (LOQ) of 0.593~1.759 μg/L and 1.95~5.80 μg/L, respectively and satisfactorily measured Jiulong river and farmland water samples.