Removal of Zn2+ and Cr6+from waste water Samples, using natural Iranian (Aftar) Zeolites

Authors

School of Earth Sciences, Damghan University, Damghan, Iran

Abstract

This paper concerns the removal of Zn2+ and Cr6+ ions from waste water using a naturally occurring zeolite from semnan region in Iran. A continuous fixed-column study was carried out by using zeolite as a low-cost adsorbent for the removal of Zn2+ and Cr6+ ions from aqueous solution under the effect of various process parameters such as, grain size and time. The efficiency of removal is higher for Zn than Cr ions. The Zn2+ and Cr6+ ions uptake by zeolite increased with initial ions concentration and column height, but decreased as the flow rate increased. The adsorption capacity reached a maximum at grain size of 0.71mm.

Keywords


  1. Barbier F., G. Due and M. Petit-Ramel,
  2. Adsorption of lead and cadmium ions
  3. from aqueous solution to the
  4. montmorilonite/ water interface, Colloid
  5. Surface PhysicochemEng Aspect, 166,
  6. ââ‚‌“159, 2000.
  7. Barer R.M., Zeolites and Clay Minerals as
  8. Sorbent and Molecular Sieves, Academic
  9. Press, New York,
  10. Breck D.W. and J. Chem. Edu. 41, 1964. 67
  11. Brigatti M. F., C. Lugli and L. Poppi, Kinetics of
  12. heavy metal removal and recovery in
  13. sepiolite, Appl. Clay. Sci., 16, 45ââ‚‌“57,
  14. Brown P. A., S. A. Gill and S. J. Allen. Metal
  15. removal from waste water using peat,
  16. Water Res. 34 (16), 3907ââ‚‌“3916,2000.
  17. Burns C. A., P. J. Class, I. H. Harding and R. J.
  18. Crawford, Adsorption of aqueous heavy
  19. metals onto carbonaceous substrate,
  20. Colloid Surface PhysicochemEng Aspect,
  21. , 63ââ‚‌“68, 1999.
  22. Chen D. and A. K. Ray, Removal of toxic metal
  23. ions from wastewater by semiconductor
  24. photocatalysis, Chem. Eng. Sci., 56,
  25. ââ‚‌“1570, 2001.
  26. Dayan, A. D. and A. J. Paine, 2001.
  27. "Mechanisms of chromium toxicity,
  28. carcinogenicity and allergenicity: review
  29. of the literature from 1985 to 2000."
  30. Human & Experimental Toxicology
  31. (9): 439-51.
  32. Eftekharnejad. J. Report of Zeolite mines
  33. exploration of Semnan province,
  34. industrial and mines organization of
  35. semnan province, 2004.
  36. Evans J. R., W. G. Davids, J. D. MacRae and A.
  37. Amirbahman, Kinetic of cadmium uptake
  38. by chitosan-based crab shells, Water
  39. Res,.36, 3219ââ‚‌“3226, 2002.
  40. Faur-Brasquet C., Z. Reddad, K. Yavuz O., Y.
  41. Altunkaynak and F. Guzel, Removal of
  42. copper, nickel, cobalt and manganese
  43. from aqueous solution by kaolinite, Water
  44. Res., 37, 948ââ‚‌“952, 2003.
  45. Garsia S. A., A. Alastuey and X. Querol, Heavy
  46. metal adsorption by different minerals:
  47. application to the remediation of polluted
  48. soils, Sci. Total. Environ.,242, 179ââ‚‌“188,
  49. Kadirvelu and P. Le Cloirec, Modeling the
  50. adsorption of metal ions (Cu2+, Ni2+, Pb2+)
  51. onto ACCs using surface complexation
  52. models, Appl. Surf. Sci. 196 (1ââ‚‌“4), 356ââ‚‌“
  53. , 2002.
  54. Karabult S., A. Karabahan, A. Denizli and Y.
  55. Yurum, Batch removal of copper(II) and
  56. zinc(II) from aqueous solution with lowrank
  57. Turkish coals, Separ. Purif.Tech.,
  58. , 177ââ‚‌“184 ,2000.
  59. Kazemian H. and H. Faghihian, Ninth article
  60. complex of IrrigationandDrainage Iran
  61. National Committee, 1998.
  62. IrrigationandDrainage Iran National
  63. emission, first edation.
  64. Mohan D. and K. P Singh, Single- and multicomponent
  65. adsorption of cadmium and
  66. zinc using activated carbon derived from
  67. bagasse ââ‚‌“ an agricultural waste, Water
  68. Res., 36, 2304ââ‚‌“2318, 2002.
  69. Pollard S. J. T., G. D. Fowler, C. J. Sollars and R.
  70. Perry, Low cost adsorbents for waste and
  71. wastewater treatment: A review, Sci.
  72. Total. Environ.,116, 31ââ‚‌“52, 1992.
  73. Sun T. and K. Seff, Chemical Reviews 94, 1994.