Authors : Rajdeo K. S., Ponrathnam S., Tambe S. S. and Chavan N. N.
Page Nos : 57-61
Description :
The adsorption study of Cd(II) ions on a low cost adsorbent such as tannins derived from tea powder is performed. Tannin formaldehyde/acetaldehyde resins based adsorbents were synthesized and their adsorption capacities were compared with virgin tea powder to remove the cadmium ion from aqueous solutions. The metal adsorption study was examined by AAS and EDS. All the methods show good agreement in results. Batch adsorption studies were carried out to examine the influence of various parameters such as initial pH, adsorbent dose, initial metal ion concentration, and time. The tannin-formaldehyde resins showed high adsorption capacity of Cd(II) ions in the range of pH 4–9, and a maximum adsorption capacity was observed at pH 6. The results indicate that tannin based tea powder can be converted into polymeric adsorbent such as tannin formaldehyde/acetaldehyde resins with simple chemistry and high selectivity, reusability and may be a promising substrate to entrap heavy metals from aqueous solutions..
Keywords: Camellia sinensis, adsorption, heavy metals, waste tea, tannins.
