Abstract
Three new porous copolymers possessing basic character were prepared by chemical modification of polymeric adsorbent (copolymer of bis[4(2-hydroxy-3-methacryloyloxypropoxy)phenyl]sulfide and glycidyl methacrylate, BES.DM + GMA). Modification was carried out by reactions of surface epoxide groups of the precursor with amines: butylenediamine, diethylenetriamine and triethylenetetramine. Next, two of the synthesized materials were chosen for further modification involving addition of HCO3 − groups to amine species. The obtained polymer adsorbents were characterised by elemental analyses, FTIR, nitrogen adsorption and thermal analyses. The prepared copolymers were studied for use as adsorbent in solid phase extraction (SPE) of multicomponent mixture of phenolic compounds consisting of: phenol, 2-chlorophenol, 2,4-dichlorophenol and 2,4,6-trichlorophenol. The SPE experiments were carried out in off-line mode. The influence of the chemical modification on adsorption properties of the presented materials was observed. The prepared adsorbents possessed different sorption properties towards the phenols. In addition, a competition phenomenon of the testing compounds for active sites on the polymer surface was observed. The most effective in adsorption of phenol and its chlorinated derivatives were the polymers with both amine and bicarbonate groups. The best recovery results were obtained for 2,4-dichlorophenol.
Highlights
Nowadays, polymers are widely used for various applications
Three new porous copolymers possessing basic character were prepared by chemical modification of polymeric adsorbent (copolymer of bis[4(2-hydroxy-3methacryloyloxypropoxy)phenyl]sulfide and glycidyl methacrylate, BES.DM ? GMA)
The recovery curves obtained for parent polymer (Fig. 7a) show typical adsorption–desorption behaviour for phenolic compounds, which is a consequence of their different solubility in water and capability to dissociate
Summary
Polymers are widely used for various applications Their chemical resistance makes them materials difficult to replace. Phenolic compounds are introduced to environmental water as a consequence of industrial, agricultural, and communal activities of humans. Their quantitative isolation from aqueous environment is often very difficult because of their polarity and low concentrations (Lu and Sorial 2007; Simpson 2000; Zhong et al 2012; Lu and Sorial 2004). This work presents studies of four newly prepared polymer-based adsorbents in the form of microspheres, used in the off-line SPE method for preconcentration of phenolic compounds. The synthesised materials possess functional groups with polar character that is important for phenols sorption process. Depending on the way of modification, the prepared sorbents possessed different sorption properties toward the phenols used in the SPE experiment
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