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A simple method for the determination of phenolic acids in Chinese Wolfberry drink based on polyethyleneimine modified porous aromatic framework and graphene oxide composite sorbent for pipette‐tip solid‐phase extraction was developed. Porous aromatic framework and raphene oxide composite materials were grafted by silane coupling agent (3‐Chloropropyl)‐trimethoxysilane. The modified materials were...
Silica and graphene oxide were separately modified by using three different kinds of silane coupling agents, including (3-chloropropyl)-trimethoxysilane (NQ54), 3-methacryloxypropyltrimethoxysilane (KH570), and (3-aminopropyl) triethoxysilane (KH550). The characterization of obtained materials was tested by Fourier transform infrared spectroscopy and scanning electron microscopy, and the electronegativity...
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