International Journal of Waste Resources

Abstract

Determination of Equilibrium Parameters of Cd(II) Adsorption by Waste Tea Leaves

Mohammad Ariful Islam*, M Moniruzzaman, M Khan, M A Hasan, M K Islam, Roknuzzaman

The waste tea leaves has been used as an adsorbent to remove Cd(II) ion from aqueous solution. The adsorption characteristics and corresponding groups responsible for adsorption process were investigated by Atomic Absorption Spectroscopy (AAS) and Infrared Spectroscopy (IR). The comparative studies revealed that the Base Treated Waste Tea Leaves (BTWTL) has maximum adsorption capacity compare to that of Acid Treated Waste Tea Leaves (ATWTL), Methanol Treated Waste Tea Leaves (MTWTL) and Water Treated Waste Tea Leaves (WTWTL). The batch experiments depicted that solution’s pH was a key factor for the adsorption process of Waste Tea Leaves (WTL). The optimum pH (4.00) and the adsorption equilibrium could be obtained by centrifuging for 180 minutes at RT and 140 RPM. The optimum dose is 1.00 g for 50 mL aqueous Cd(II) solution which concentration was 10 ppm. IR spectroscopy analysis showed that carbonyl and hydroxyl groups were mainly responsible for the adsorption of Cd(II) and acted as the active sites. Adsorption isotherms studies showed that Langmuir isotherm and Freundlich isotherm fitted well and Temkin isotherm also fitted quite good. These suggested that Waste Tea Leaves (WTL) can be used as a potential and appealing adsorbent for the removal of Cd(II) from aqueous solutions. Which could be used for removing of Cd(II) from the waste water in future.

Published Date: 2024-03-06; Received Date: 2019-08-30