Sorption of organic compounds in the aqueous phase onto tire rubber
ABSTRACT Batch sorption tests were conducted to investigate the sorption capacity of organic compounds by ground tire and to assess the effects of the presence of other organic compounds, ionic strength, pH, ground tire particle size, and temperature on sorption. None of the factors were significant under the conditions tested, m-Xylene had the highest partition coefficient, followed by ethylbenzene, toluene, trichloroethylene, 1,1,1-trichloroethane, chloroform, and methylene chloride (13 L/kg). The partition coefficients had a logarithmic linear relationship with the octanol-water partition coefficients. The diffusion coefficients of the compounds tested were in the range of 10â»â¸ cmÂ²/s. The diffusion coefficients did not correlate well with the physical/chemical properties, such as molecular size, of the compounds tested. The heat of solutions of the compounds tested had relatively low values. Thus, the sorption may not be affected significantly by temperature change. Organic compounds sorbed onto tire rubber appear to be sorbed primarily onto tire rubber polymeric materials and partially carbon black in the tire rubber. Overall, ground tire shows significant capacity as a sorbent of organic compounds.
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ABSTRACT: The potential use of waste tyre rubber gran-ules (WTRG) for the batch adsorption of naph-thalene from aqueous solutions was investigat-ed. The effect of various operational variables such as contact time, initial naphthalene con-centration, adsorbent dose, size of adsorbent particles, and temperature of solution on the adsorption capacity of WTRG was evaluated. The adsorption of naphthalene by WTRG was a fast kinetic process with an equilibrium contact time of 60 min. A low temperature (5°C), small adsorbent particle size (0.212 mm) and higher adsorbent dosage favored the adsorption process. Results of isotherm studies revealed that adsorption of naphthalene was best described by the Langmuir isotherm equation (R 2 =0.997) while the kinetics of the process was best described by the Lagergren pseudo-first order kinetic equation (R 2 =0.998). This study has demonstrated the suitability of WTRG for the removal of naphthalene from aqueous solution.Journal of Xenobiotics. 07/2014; 4(1):22-28.
- Geotechnical Testing Journal - GEOTECH TESTING J. 01/2009; 32(1).