Synthesis of a novel composite imprinted material based on multiwalled carbon nanotubes as a selective melamine absorbent.
A novel composite imprinted material, on the basis of a multiwalled carbon nanotube (CNT)-incorporated layer using melamine as a template, methacrylic acid as a functional monomer, and ethylene glycol dimethacrylate as a cross-linker, was synthesized by a surface imprinting technique. The imprinted/CNT sorbent was characterized by a scanning electron microscope (SEM). Adsorption dynamics and a Scatchard adsorption model were employed to evaluate the adsorption process. The results showed that the imprinted/CNT sorbent displayed a rapid dynamic adsorption and a high adsorption capacity of 79.9 μmol g(-1) toward melamine. Applied as a sorbent, the imprinted/CNT sorbent was used for the determination of melamine in a real sample by online solid-phase extraction-high-performance liquid chromatography (SPE-HPLC). An enrichment ratio of 563-fold, detection limit (S/N = 3) of 0.3 μg L(-1), and quantification limit of 4.5 μg L(-1) were achieved.
College of Chemistry and Chemical Engineering, Jishou University , Jishou 416000, People's Republic of China.
Huabin
H
Zhang
Zhaohui
Z
Zhang
Yufang
Y
Hu
Xiao
X
Yang
Shouzhuo
S
Yao
D000327:Adsorption; D002851:Chromatography, High Pressure Liquid; D005506:Food Contamination / Q000517:prevention & control; D008855:Microscopy, Electron, Scanning; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D012117:Resins, Synthetic; D014227:Triazines / Q000032:analysis* / Q000302:isolation & purification
D037742:Nanotubes, Carbon; D012117:Resins, Synthetic; D014227:Triazines; C011907:melamine