Preparation of Magnetic Superhydrophilic Imprinted Nanocomposite Resin and its Application in the Extraction of Chlorophenols in Water

Fabricating hydrophilic imprinted materials with eminent aqueous recognition capacity is a bottleneck problem in imprinting field. Herein, a magnetic superhydrophilic imprinted nanocomposite resin (MWNTs@MIR) was first fabricated on magnetic multi walled carbon nanotube with 2,4,6-trichlorophenol as virtual template, 3-aminophenol as functional monomer and glyoxylic acid as crosslinking monomer. Via employing MWNTs@MIR as adsorbent and combining with magnetic solid-phase extraction, the effective enrichment of chlorophenols (CPs) in water is realized. The SEM, TEM, FTIR, XRD and other characterizations confirm that the MWNTs@MIR has been successfully prepared and exhibits excellent magnetism (separated by external magnet within 30 s) and superhydrophilicity (water contact angle 0 degrees). Under optimized extraction conditions, MWNTs@MIR can be directly employed for rapid and efficient extraction of four CPs in water (the extraction recoveries reach 78 %-92 %), and exhibits excellent selectivity (the extraction efficiency of MWNTs@MIR for the four CPs is evidently higher than that of the corresponding non-imprinted material and reference compound) and stability (the recoveries of CPs did not significantly decrease after 5 cycles). The research provided a novel, easy and economical route for constructing hydrophilic imprinted materials to realize efficient extraction of CPs in water, and has potential application in the field of sample pretreatment and analytical chemistry.