Molecularly imprinted polymer modified TiO2 nanotube arrays for photoelectrochemical determination of perfluorooctane sulfonate (PFOS)

Selective Removal of Perfluorooctanoic Acid Using Molecularly Imprinted Polymer-Modified TiO2Nanotube Arrays

“…Tran et al developed a photoelectrochemical sensor fabricated by surface modification of TiO 2 nanotube arrays with MIP. They reported that the as-prepared sensor was highly sensitive to PFOS and exhibited outstanding selectivity [16]. The results of the abovementioned studies show that MIP adsorption is an effective method for the selective removal of targeted PFCs from water.…”

“…Molecular imprinting is a useful technique for preparing polymeric materials as specific molecular recognition receptors [14][15][16]. Molecularly imprinted polymers (MIPs) are prepared by polymerizing in the presence of cross-linkers and the polymerizable complexes formed from template species and monomers, which results in binding sites complementary to the template molecule.…”

“…The molecularly imprinted polymers were fabricated on the TiO 2 NTs as follows [14][15][16]: the TiO 2 NTs were immersed into anhydrous toluene solution containing 1% (v/v) APTS and 1% (v/v) MPTS. The mixture was then purged with nitrogen gas for 15 min and heated at 60 ∘ C for 4 h. The resulting APTS-and MPS-modified TiO 2 NTs were washed with toluene and acetonitrile, respectively, and dried in nitrogen gas.…”

“…These results indicated that the observed difference in adsorption capacity and intensity should be attributed to the footprint cavities existing in the imprinted polymers. The enhanced adsorption of PFOA on the absorbents was caused by the presence of special binding sites [14,16,19]. Only the template molecules could be bound in these sites, which required not only specific functional groups (-NH 2 ) but also matching target molecule size.…”

“…The acrylamide monomer and PFOA target molecules polymerized together. The target molecules were removed and left a special polymer with voids of particular shape and size [16]. However, some functional monomers that did not form complexes remained on the surface of the polymer after polymerization.…”