Viruet Vigo, Misael

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    Removal of the oxytetracycline antimicrobial from aqueous solution using waste tire crumb rubber
    (2011) Viruet Vigo, Misael; Román Velázquez, Félix R.; College of Arts and Sciences - Sciences; Perales Pérez, Oscar J.; Joubert Castro, Aidalú; Department of Chemistry; Walker Ramos, Uroyoán R.
    As of today we face serious problems of pollution, of which one is the excess of antimicrobial compounds (e.g. Oxytetracycline, OTC) and another is the stockpiles of used tires. Our research project evaluated the sorption behavior of OTC onto waste tire crumb rubber (WTCR) in aqueous solution; since previous studies showed that WTCR has a great potential for sorption of antimicrobial compounds. OTC samples from 25 to 150 mg/L (ppm) at neutral pH were placed in contact with 10 g/L of crumb rubber mesh 14-20 (2.45 mm of diameter) for 84 hours. The samples were collected at different intervals and analyzed by High Performance Liquid Chromatography with a Diode Array Detector (HPLC-DAD) at 353 nm using an Eclipse XDB-C8 column for separation. The analysis showed that WTCR (mesh 14-20) has great sorption capability for OTC, with a removal percentage of 60% - 95% depending on its initial concentration. A 48 hours WTCR stability test was performed at pH 1.5, 3.0 and 7.0 using an Inductive Coupled Plasma-Mass Spectrometry (ICP-MS) in order to determine the release of metals and their concentrations from the crumb rubber into the aqueous solution. The stability test showed that chromium and zinc were the most released Also the adsorption behavior of Oxytetracycline onto carbon black in aqueous solution was also evaluated, as carbon black is one of the main components present in the crumb rubber. The results demonstrated that it has nearly 100% removal of OTC and shorter equilibrium times when compared with WTCR. We also evaluated de sorption behavior of oxytetracycline using WTCR mesh 30 (<0.67 mm of diameter). Our results show that WTCR mesh 30 has better sorption capabilities than WTCR 14- 20.