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.
"In a permeation of organic compounds through rubber gaskets study, Park and Bontoux (1991) reported that rubber is a good sorbent for organic compounds. Kim et al. (1997) reported that organic compounds were sorbed primarily onto tire rubber polymeric materials and partially carbon black in the tire rubber, and the partition coefficients had a logarithmic linear relationship with the octanol–water partition coefficients. Gunasekara et al. (2000) further investigated the use of ground discarded tires to remove naphthalene and toluene from water. "
[Show abstract][Hide abstract] ABSTRACT: Waste tire related environmental problems and its recycling techniques have been a major challenge to society. Current waste tire recycling market is too small to accommodate the tire generated annually. Therefore, it is of crucial importance to develop new markets for waste tires. Tire rubber is flexible and has hydrophobic (oil-philic) characteristics, making it a good candidate as an oil adsorbent. In this paper, the possibility of applying waste tire powder as a sorbent for the recovery of spilled oil was explored. The results indicate that 2.2 g of motor oil can be adsorbed to each gram of 20 mesh tire powder. Due to its elastic property, waste tire powder is re-usable for over 100 times without decreasing its oil absorption efficiency. Therefore, at least 220 g of motor oil can be recovered per gram of waste tire powder, which is very competitive to commercial sorbent. The results of this study indicated that sorption efficiency increased as the tire powder particle size decreased, and decreased as the environmental temperature increases. When applying the waste tire powder to oil slicks on seawater, the oil sorption efficiency is shown to be better than if it was on fresh water. Efforts have been made to enhance the waste tire powder's oil sorption efficiency. Results indicated that the highest efficiency was obtained when the waste tire powder was pre-cleaned by n-hexane, followed by water cleaning > un-cleaned > dishwashing liquid cleaned > seawater cleaned. Compared to a commercial oil sorbent, the result indicated that waste tire powder was economically more feasible, if it was re-used for 100 times. More efforts are encouraged to enhance the waste tire powder's oil sorption capacity without decreasing its re-usable characteristics.
"Furthermore, there is growing interest in the utilization of recycled materials for remediation of contaminated groundwater as a part of sorptive barrier investigations. Recycled materials, such as tire chips (Kim et al 1997) and foundry sand (Lee et al. 2004) have also been studied to investigate their feasibility as sorptive medium in these barrier systems. Approximately 90% of the coal used in United States is burned to produce electricity. "
[Show abstract][Hide abstract] ABSTRACT: Approximately 90% of the coal used in the United States is burned to produce electricity. As a result, the power plants produce vast quantities of Class F fly ash. The amount of unburned carbon in these fly ashes has been increasing in the last decade due to introduction of low nitrogen oxide burners to coal-burning power plants. Such fly ashes have no value as a concrete additive and require high land-filling costs. The objective of this study was to investigate potential use of these high carbon content fly ashes (HCCFA) in sorptive barrier applications. Naphthalene and o-xylene sorption onto fly ash was studied in a series of batch adsorption tests. Column sorption tests were also conducted on sand-fly ash mixtures with naphthalene and o-xylene. The results indicated that HCCFA has significant capacity for retardation of petroleum contaminants in barrier applications. Sorbed amounts measured in batch scale tests and breakthrough curves from column tests suggested that the amount and type of carbon has a significant effect on remediation efficiency.
"Danwanichakul, P., et al. 1079 particles. Carbon black was tested to adsorb organic compound and was found that its sorption capacity was 20-60% of the tire rubber (Kim et al., 1997). Therefore, carbon black could contribute 5-15% of total adsorption capacity. "
[Show abstract][Hide abstract] ABSTRACT: The transport mechanism of several pure liquid organic substances into natural rubber chips composed of different fillers was investigated. It was found that, for the same type of chips, the Fickian diffusion of toluene was the fastest, followed by m-xylene, water and p-cresol. The toluene uptake was highest which was as high as 3.42 times of the chip weight. This was closely followed by m- xylene uptake, which was much higher than p-cresol uptake and water uptake which was only 0.02 times of the chip weight, implying that natural rubber could be used to remove these organic substances contaminated in water. The desorption of substances into air followed the similar trend as sorption. Besides, for any substances, the results showed that unfilled chips had the largest sorption capacity, followed by ones with calcium carbonate and carbon black.
Songklanakarin Journal of Science and Technology 09/2006; 28(5).
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