A basic investigation on the removal of Pb(II) ions from aqueous solutions by using activated tea waste was conducted in batch conditions. An inexpensive and effective adsorbent was developed from waste tea leaves for the uptake of Pb(II) from aqueous solution. The influence of different experimental parameters--shaking time, particle size, adsorbent dose, initial pH, temperature, etc.--on lead uptake was evaluated. Lead is adsorbed by the developed adsorbent up to maximum of 99.7%. The initial Pb(II) concentrations were 5, 10, 15 and 20 mg/l in the experiment. The adsorption was found to be exothermic in nature. The Langmuir, Freundlich and Tempkin isotherm models were tried to represent the equilibrium data of Pb(II) adsorption. The adsorption data was fitted very well to the Langmuir isotherm model in the studied concentration range of Pb(II) adsorption. Isotherms have been used to determine thermodynamic parameters of the process: free energy change (ΔGº), enthalpy change (ΔHº) and entropy change (ΔSº)._x000D_ Column experiments were performed to study the practical applicability of the system. The kinetics and the factors controlling the adsorption process were also discussed. Activated tea waste is a better adsorbent compared to other adsorbents available in literature.

Adsorption Pb(II) Kinetics Adsorption Isotherms Activated Tea Waste

Esteves AJP, Valdman E, Leite SGF, Biotechnol. Lett., 22(6), 499 (2000)
Gupta VK, Ali I, J. Colloid Interface Sci., 271(2), 321 (2004)
Gupta VK, Gupta M, Sharma S, Water Res., 35, 1125 (2001)
Sekar M, Sakthi V, Rengaraj S, J. Colloid Interface Sci., 279(2), 307 (2004)
Mouflih M, Aklil A, Sebti S, J. Hazard. Mater., 119(1-3), 183 (2005)
Tor A, Cengeloglu Y, J. Hazard. Mater., 138(2), 409 (2006)
Naseem R, Tahir SS, Water Res., 35, 3982 (2001)
Reed BE, Arunachalam S, Thomas B, Environ. Progr., 13, 60 (1994)
Raji C, Shubha KP, Anirudhan TS, Indian J. Environ. Health, 39, 230 (1997)
Abdel-Halim SH, Shehta AMA, EI-Shahat MF, Water Res., 37, 1678 (2003)
Salim R, Al-Subu M, Dawod E, J. Environ. Manage., 87, 521 (2008)
Sawalha MF, Peralta-Videa JR, Sanchez-Salcido B, Gardea-Torresdey JL, J. Environ. Manage., 90, 1213 (2009)
Sen Gupta B, Curran M, Hasan S, Ghosh TK, J. Environ. Manage., 90, 954 (2009)
Wang XS, Li ZZ, Tao SR, J. Environ. Manage., 90, 721 (2009)
Ahluwalia SS, Goyal D, Eng. Life Sci., 5, 158 (2005)
Amarasinghe BMWPK, Williams RA, Chem. Eng. J., 132(1-3), 299 (2007)
Tee TW, Khan ARM, Environ. Technol. Lett., 9, 1223 (1988)
Cruz CCV, da Costa ACA, Henriques CA, Luna AS, Bioresour. Technol., 91(3), 249 (2004)
Bitton G, Waste water microbiology, Willey, Europe (1999)
Benguella B, Benaissa H, Water Res., 36, 2463 (2002)
Cooney DO, Adsorption design for wastewater treatment, Lewis Publishers, Boca Raton, FL (1999)
Mc Kay G, Use of adsorbents for the removal of pollutants from wastewaters, CRC Press, Boca Raton, FL (1996)
Tempkin MJ, Pyzhev V, Acta Physiol. Chem. USSR, 12, 271 (1940)
Giles CH, Mc Ewan TH, Nakhwa SW, Smith D, J. Chem. Soc., 4, 3973 (1960)
Taty-Costodes VC, Fauduet H, Porte C, Delacroix A, J. Hazard. Mater., 105(1-3), 121 (2003)
Dogan M, Alkan M, Turkyilmaz A, Ozdemir Y, J. Hazard. Mater., B109, 141 (2004)
Aydin H, Bulut Y, Yerlikaya C, J. Environ. Manage., 87, 37 (2008)
Mondal MK, Int. J. Sus. Dev. Plann., 3, 377 (2008)
Issabayeva G, Aroua MK, Sulaiman NMN, Bioresour. Technol., 97(18), 2350 (2006)
Goel J, Kadirvelu K, Rajagopal C, Garg VK, Ind. Eng. Chem. Res., 44(7), 1987 (2005)
Doyurum S, Celik A, J. Hazard. Mater., 138(1), 22 (2006)