Magnetic graphene oxide decorated with chitosan and Au nanoparticles: synthesis, characterization and application for detection of trace rhodamine B

摘要

A novel magnetic graphene oxide modified with Au nanoparticles (Fe3O4@CS/GO/Au) as an efficient adsorbent was prepared for the detection of rhodamine B (RB) coupled with fluorescence spectrophotometry. The as-prepared Fe3O4@CS/GO/Au was characterized by using a field emission scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS), and vibrating sample magnetometer (VSM). The main parameters, which affect extraction and desorption efficiencies, were systematically investigated and optimized. Under the optimal conditions, good linearities (0.1-6.0 mu g L-1) with R-2 = 0.9990, LODs (0.03 mu g L-1) and LOQs (0.1 mu g L-1) were achieved. Compared with chitosan-coated magnetic nanoparticles (Fe3O4@CS) and graphene oxide-modified Fe3O4@CS (Fe3O4@CS/GO), Fe3O4@CS/GO/Au exhibited optimal extraction efficiency. To demonstrate the application potency of Fe3O4@CS/GO/Au, it was successfully applied to isolate and extract RB from tap water, waste water, soft drink and eye shadow and the spiked recoveries were between 94.51% and 101.24% with RSD values from 1.95% to 6.15%. It was confirmed this novel method was an efficient pretreatment and enrichment procedure and could be successfully applied for the extraction and determination of trace RB in complex matrices.