Eggshell and coral wastes as low cost sorbents for the removal of Pb2+, Cd2+ and Cu2+ from aqueous solutions

다국어 초록 (Multilingual Abstract)

Rapid industrialization in Korea has led to the discharge of heavy metals to water, posing a threat to the environment. The use of natural materials as low cost sorbents for the removal of heavy metals from aqueous solutions has recently received increasing attention. The present study was conducted to evaluate the effectiveness of eggshell and coral wastes for the removal of Pb2+, Cd2+ and Cu2+ from aqueous solutions. Batch equilibrium experiments were conducted using heavy metal solutions with waste eggshell and coral powders. Langmuir and Freundlich adsorption models were used for the mathematical description of sorption equilibrium. The maximum amounts of metals (Cu2+, Pb2+ and Cd2+) adsorbed were found to be 32.3, 22.9 and 4.47 mmol kg1 for eggshell and 6.77, 5.52 and 1.03 mmol kg1 for coral wastes,respectively. At low initial concentrations the adsorption of heavy metals onto both sorbents can be described as H-type (except for the Cd adsorption onto coral), indicating high-affinity isotherms and strong adsorbate–adsorptive interactions such as inner sphere complexes. However, the metal adsorption was described by L-type isotherm at high initial concentrations. Based on the distribution coefficient (Kd) values and the percentage of metal removed, the selectivity sequence in eggshells and coral wastes was found to be Pb2+ > Cu2+ > Cd2+. The Kd values and the percentage of metals removed were higher in eggshells than coral with its higher capacity to adsorb heavy metals. Based on the results of the present study, eggshell and coral wastes can be used for the removal of heavy metals from aqueous solutions.

참고문헌 (Reference)

1 J. Jung, 262 : 371-, 2004

2 S. Milonjic, 72 : 1363-, 2007

3 S. Gao, 93 : 331-, 1997

4 N.T. Basta, 153 : 331-, 1992

5 P.C. Gomes, 65 : 1115-, 2001

6 H.A. Aziz, 99 : 1578-, 2008

7 O.D. Uluozlu, 99 : 2972-, 2008

8 S. Senthilkumaar, 75 : 163-, 2000

9 B. Pan, 40 : 2938-, 2006

10 J.E. Yang, 25 : 227-, 2006

11 J.E. Yang, 55 : 197-, 2007

12 S.S. Ahluwalia, 98 : 2243-, 2007

13 Y.S. Ok, 147 : 91-, 2007

14 A. Ozer, 100 : 219-, 2003

15 A. Cabuk, 131 : 293-, 2007

16 J. Wang, 24 : 427-, 2006

17 R. Gargarello, 29 : 1341-, 2008

18 J. Kadukova, 31 : 227-, 2005

19 K. Mohanty, 117 : 71-, 2006

20 S. Ahmady-Asbchin, 30 : 755-, 2009

21 K. Chojnacka, 59 : 75-, 2005

22 F. Veglio, 44 : 301-, 1997

23 A. Kapoor, 53 : 195-, 1995

24 Y.S. Ok, 61 : 1301-, 2010

25 Y.S. Ok, 33 : 83-, 2011

26 Y.S. Ok, 33 : 31-, 2011

27 H.J. Park, 19 : 1436-, 2007

28 C. Arunlertaree, 29 : 857-, 2007

29 B. Kaczorowska, 377 : 1032-, 2003

30 O. Tunusoglu, 41 : 379-, 2007

31 M. Zargaran, 118 : 135-, 2010

32 J.J. Msaky, 150 : 513-, 1990

33 P.A. Brown, 34 : 3907-, 2000

34 L.H. Wang, 41 : 585-, 2010

35 M.O. Corapcioglu, 21 : 1031-, 1987

36 K.K. Panday, 19 : 869-, 1985

37 U.K. Saha, 66 : 117-, 2002

38 A.R.A. Usman, 144 : 334-, 2008

39 P.R. Anderson, 39 : 15-, 1988

40 MIFAFF, "The statistics for consumption of major livestock products. Ministry forFood, Agriculture, Forestry and Fisheries, Republic of Korea"

41 B.J. Alloway, "Heavy Metals in Soils" Blackie Academic &Professional 11-, 1995

42 B.W. Halstead, "Fossil Stony Coral Minerals and their Nutritional Application" Health Digest Publishing Company 1999

43 D.L. Sparks, "Environmental Soil Chemistry" Academic press 2003

44 Jae E. Yang, "Capacity of Cr(VI) reduction in an aqueous solution using different sources of zerovalent irons" 한국화학공학회 23 (23): 935-939, 2006