# Novel Polymer Sorbents with Imprinted Task-Specific Ionic Liquids for Metal Removal  
[PERSON]  
1 Institute of Chemical Technology and Engineering, Poznan University of Technology, 60-965 Poznan, Poland; [EMAIL_ADDRESS] (K.F. ); [EMAIL_ADDRESS] (P.D. ); [EMAIL_ADDRESS] (A.L. ); [EMAIL_ADDRESS] (A.M.)  
[PERSON]  
1 Institute of Chemical Technology and Engineering, Poznan University of Technology, 60-965 Poznan, Poland; [EMAIL_ADDRESS] (K.F. ); [EMAIL_ADDRESS] (P.D. ); [EMAIL_ADDRESS] (A.L. ); [EMAIL_ADDRESS] (A.M.)  
[PERSON]  
1 Institute of Chemical Technology and Engineering, Poznan University of Technology, 60-965 Poznan, Poland; [EMAIL_ADDRESS] (K.F. ); [EMAIL_ADDRESS] (P.D. ); [EMAIL_ADDRESS] (A.L. ); [EMAIL_ADDRESS] (A.M.)  
[PERSON]  
2 Institute of Materials Research and Quantum Engineering, Poznan University of Technology, 60-965 Poznan, Poland; [EMAIL_ADDRESS] (A.P.) [PERSON]  
3 Faculty of Materials Engineering and Technical Physics, Poznan University of Technology, 60-965 Poznan, Poland; [EMAIL_ADDRESS] (P.D. ); [EMAIL_ADDRESS] (A.L. ); [EMAIL_ADDRESS] (A.M.)  
[PERSON]  
1 Institute of Chemical Technology and Engineering, Poznan University of Technology, 60-965 Poznan, Poland; [EMAIL_ADDRESS] (K.F. ); [EMAIL_ADDRESS] (P.D. ); [EMAIL_ADDRESS] (A.L. ); [EMAIL_ADDRESS] (A.L.) [PERSON]  
1 Institute of Chemical Technology and Engineering, Poznan University of Technology, 60-965 Poznan, Poland; [EMAIL_ADDRESS] (A.L. ); [EMAIL_ADDRESS] (A.M.)  
Footnote 1: email: {k.k. nature of the metals, their concentration, and the composition of the solution. For example, during precipitation, other contaminants are created due to the use of chemical reagents [6]. The low cost of naturally occurring sorbents encourages researchers to modify their surface, resulting in new sorbents. Adsorption techniques using chelating groups on sorbents' surface are recently very popular in separation chemistry thanks to the low cost, high adsorption capacity, good regeneration, and good selectivity for certain metal ions [7]. Some of the modified sorbents are silica gel [8], activated carbon [9], zeolites [10], and cellulose derivatives [11]. The functionalization of synthetic sorbents with ionic liquids is an example of process that also fits into the idea of green chemistry. Ionic liquids are alternative media in separation applications as a result of its advantages, such as non-inflammatory and non-toxicity [12]. Ionic liquids (IL) such as quaternary pyridinium salts have suitable physicochemical properties for use in the separation processes of organic and inorganic compounds. Particularly high extraction properties and specific mechanism in a liquid-liquid system caused the immobilization of ILs on silica or polymer supports [13; 14; 15]. By incorporating organic functional groups onto the silica surface, there is an increase in uptake of metals and CO\({}_{2}\), which improves the process efficiency [16; 17; 18; 19; 20], while a combination of polymers and ionic liquids can simultaneously remove both inorganic and organics pollutants from water [21]. The immobilization on polymer supports was performed both in the case of commercial ILs as well as newly designed compounds, although in the first group, mainly impregnation was used. An example is the immobilization of Cyphos IL-101 (tetradecyl(trihexyl)phosphonium chloride) onto Amberlite XAD series sorbents and Pd(II), Fe(III), Hg(II), Au(III), and Pt(IV) sorption from HCl [22; 23; 24; 25]. Our previous studies also confirmed that the functionalization of PS-DVB by the incorporation and encapsulation of ionic liquid extractant [26; 27] or by quaternization with IL-precursors to obtain the IL-functionalized polymers enabled us to obtain efficient sorbents [13; 28]. The most interesting results were obtained for chromium removal. It was demonstrated that the sorbents functionalized by hydrophilic pyridylketones were responsible not only for adsorption of chromium(VI) but also for a reduction to a less toxic Cr(III).