Synthesis, characterization and evaluation of two crosslinked polymeric resins and their comparison with walnut shell in oil removal from water.

The aim of this paper was to compare two kinds of adsorbents (walnut shell and polymeric resins) in terms of their efficiency to remove oil from water, since walnut shell losses weight during the process requiring interruption, while polymeric resins do not. Polymeric resins based on glycidyl methacrylate and divinylbenzene (GMA-DVB) and styrene and divinylbenzene (STY-DVB) were synthesized and characterized. All adsorbents were tested by continuous flow process, eluting 3,000 bed volumes of synthetic oily water, and the oil content was monitored by fluorescence spectroscopy. Although the walnut shell presented high efficiency (∼94%), STY-DVB was even better (∼100%) besides presenting better mechanical resistance. Moreover, polymeric resins, mainly when based on GMA, can be chemically modified to remove specific contaminants still remaining in water after conventional treatment.