World Academy of Science, Engineering and Technology
Published March 25, 2009 | Version 14999
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Adsorptive Removal of Vapors of Toxic Sulfur Compounds using Activated Carbons

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Adsorption of CS2 vapors has been studied on different types of activated carbons obtained from different source raw materials. The activated carbons have different surface areas and are associated with varying amounts of the carbon-oxygen surface groups. The adsorption of CS2 vapors is not directly related to surface area, but is considerably influenced by the presence of carbonoxygen surface groups. The adsorption decreases on increasing the amount of carbon-oxygen surface groups on oxidation and increases when these surface groups are eliminated on degassing. The adsorption is maximum in case of the 950°-degassed carbon sample which is almost completely free of any associated oxygen. The kinetic data as analysed by Empirical diffusion model and Linear driving force mass transfer model indicate that the adsorption does not involve Fickian diffusion but may be considered as a pseudo first order mass transfer process. The activation energy of adsorption and isosteric enthalpies of adsorption indicate that the adsorption does not involve interaction between CS2 and carbon-oxygen surface groups, but hydrophobic interactions between CS2 and C-C atoms in the carbon lattice.

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References

  • S. Tanada, K. Boki and K. Matsumoto, "Adsorption properties of methyl sulfide and methyl disulfide on activated carbon, zeolite, and silicate, and their porous structure" Chem. Pharm. Bull., Vol. 26, pp.1527-1532, 1978.
  • S. Tanada and K. Boki, "Studies on the physicochemical properties of activated carbon, zeolites and silicates for adsorption removal of hydrogen sulfide, methyl mercaptan, dimethyl sulfide, trimethyl amine and ammonia gases" Tokushima Bunri Daigaku Kenkyu Kiyo, Vol. 15, pp 33-38, 1976.
  • R.W. Glass and R.A. Ross, "Surface studies of the adsorption of sulfurcontaining gases at 423 K on porous adsorbents .I. The adsorption of hydrogen sulfide, methanethiol, ethanethiol and dimethylsulfide on silica gels" The Journal of Physical Chemistry, Vol. 77, pp. 2571-2576 , 1973.
  • S. Tsutsui and S. Tanada, "Adsorption of hydrogen sulfide, dimethyl sulfide, and their binary mixtures into pores of nitrogen-containing activated carbon", Chem. Pharm. Bull., Vol. 35, pp. 1238-1242, 1987
  • R.W. Glass and R.A. Ross, "Surface studies of the adsorption of sulfurcontaining gases at 423 K on porous adsorbents .I. The adsorption of hydrogen sulfide, methanethiol, ethanethiol and dimethylsulfide on alumina" Journal of Physical Chemistry, Vol. 77, pp. 2576-2578 , 1973
  • H.L. Fan, C.H. Li and H.X. Guo, "A study on removal of organic sulfur compound with modified activated carbon "Journal of Natural Gas Chemistry, Vol. 8, pp. 151-156, 1999.
  • H.L. Fan, G. J. Jin, J. Shangguan, H. X. Guo and Y.A. Li, " Study on kinetic behaviour of adsorbing CS2 and CS2 + H2O by activated carbon using thermogravimetric technique" Acta Scientiae Circumstantiae, Vol. 19, pp. 489-493, 1999.
  • B. Guo, L. Chang and K. Xie "Study of the behavior of adsorbing CS2 by activated carbon" Fuel Processing Technology, Vol. 87, pp. 873-881, 2006.
  • R.C. Bansal and M. Goyal, Activated Carbon Adsorption, Taylor & Francis, CRC Group, New York, 2005. [10] R.C. Bansal, J.B. Donnet and F. Stoeckli, Active Carbon, Marcel Dekker, New York, 1988. [11] J.B. Donnet, R.C. Bansal and F. Wang, Carbon Black, Marcel Dekker, New York, 1993. [12] R.C. Bansal, N. Bhatia and T.L. Dhami, "Surface characteristics and surface behaviour of polymer carbons .III. Surface acidity of polymer carbons", Carbon, Vol. 16, pp. 65-68, 1978. [13] S.S. Barton, D. Gillespie and B.H. Harrison, "Surface studies of carbon. Acidic oxides on spheron 6", Carbon, Vol. 11, pp. 649-654, 1973. [14] B.R. Puri and R.C. Bansal, "Surface chemistry of carbon blacks. II. Surface acidity in relation to chemisorbed oxygen", Carbon, Vol. 1, pp. 457-464, 1964. [15] M. Goyal, V.K. Rattan, D. Aggarwal and R.C. Bansal, "Removal of copper from aqueous solutions by adsorption on activated carbons", Colloids Surf. A: Physicochemical and Engineering Aspects, Vol. 190, pp. 229- 238, 2001. [16] J. Crank, The Mathematics of Diffusion, 2nd ed., Clarendon Press, Oxford, 1975 [17] N.J. Foley, K.M. Thomas, P.L. Forshaw, D. Stanton and P.R. Norman, "Kinetics of water vapor adsorption on activated carbon", Langmuir, Vol. 13, pp. 2083-2089, 1997. [18] J. Yang, P. Juan, Z. Shen, R. Guo, J. Jia, H. Fang and Y. Wang, "Removal of carbondisulfide from water via adsorption on activated carbon fiber" Carbon , Vol. 44, pp. 1367-1375, 2006.