Abstract
Abstract The synthesis and characterization of porous poly(acrylonitrile(AN)-co-divinylbenzene-80 (DVB-80)-co-vinylbenzylchloride (VBC)) polymers with high specific surface areas and weak anion-exchange character have been successfully researched. The hypercrosslinked (HXL) microspheres were chemically modified with 1,2-ethylenediamine (EDA) to enhance the adsorption selectivity of the HXL materials. The zeta potential of EDA-modified HXL poly(AN-co-DVB-80-co-VBC) revealed that the surface of the modified terpolymer was positively charged. The FT-IR spectra of the chemically modified hypercrosslinked poly(AN-co-DVB-80-co-VBC) showed that the nitrile groups derived from the AN unit were utilised by the presence of diamine groups. The BET-specific surface areas of the EDA-modified hypercrosslinked poly(AN-co-DVB-80-co-VBC) was 503 m2 g−1; meanwhile, the specific surface area of the HXL terpolymer was 983 m2 g−1. The adsorption isotherm data were well fitted by both the Langmuir and Freundlich models, whereas the adsorption kinetics followed the pseudo-second-order kinetic model. This study confirms that the EDA-modified hypercrosslinked poly(AN-co-DVB-80-co-VBC) terpolymer is a potential adsorbent for the adsorption of acidic pharmaceuticals.
Highlights
The presence of a pharmaceutically active compound in surface and groundwater is a matter of great concern as they are used as a resource for the production of potable water
There has been little discussion about the utilisation of acrylonitrile-based polymer as an adsorbent for the adsorption of pharmaceutical residues. In this present study, the cyano groups in the HXL poly(AN-co-DVB80-co-vinyl benzyl chloride (VBC)) terpolymer were chemically modified with ethylenediamine (EDA) to develop weak anion-exchange (WAX) characters in the sorbent system by converting the nitrile functional groups into diamine moieties to enhance the selectivity of the sorbent
The absorption band at ∼1,270 cm−1, which was assigned to the chloromethyl groups, was presented in poly(AN-co-DVB-80-co-VBC) Fourier transform infrared (FT-IR) spectrum (Figure 1a); this band almost disappeared in the HXL poly(AN-co-DVB-80-co-VBC) spectrum (Figure 1b) following hypercrosslinking, which was the result of the consumption of chloromethyl groups
Summary
The presence of a pharmaceutically active compound in surface and groundwater is a matter of great concern as they are used as a resource for the production of potable water. There has been little discussion about the utilisation of acrylonitrile-based polymer as an adsorbent for the adsorption of pharmaceutical residues In this present study, the cyano groups in the HXL poly(AN-co-DVB80-co-VBC) terpolymer were chemically modified with ethylenediamine (EDA) to develop weak anion-exchange (WAX) characters in the sorbent system by converting the nitrile functional groups into diamine moieties to enhance the selectivity of the sorbent. The preparation of synergistic sorbent materials (chemically modified hypercrosslinked poly(acrylonitrile (AN)-co-divinylbenzene-80 (DVB-80)-co-vinyl benzyl chloride (VBC)) in the form of monodisperse microspheres associated with good selectivity and capacity toward polar compounds has not been reported elsewhere (Scheme 2)
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