Waste tea leaves have been used for the removal of lead, iron, zinc and nickel from water by Ahluwalia and Goyal [117]. The order of adsorption of metal was: Pb > Fe > Zn > Ni from 5 to 100 mg/L of metal solution. Adsorption of copper and lead ions onto tea waste from aqueous solutions was studied by Amarasinghe and Williams [118]. The highest metal uptake of 48 and 65 mg/g was observed for Cu and Pb, respectively. Mozumder et al. [119] also investigated the potential of tea-leaves waste for Cr(VI) removal and reported that adsorption of Cr(VI) was highly pH dependent, and the removal efficiency dropped sharply from 95% to 10% when pH of the system increased from 2 to 5. The adsorption ability of Turkish tea waste (fibrous) was investigated for the removal of Cu(II) and Cd(II) from single (non-competitive) and binary (competitive) aqueous systems [120]. Adsorption of the investigated heavy metal ions by tea waste was found to be strongly dependent on pH, contact time, initial concentration of the heavy metal ions and adsorbent dosage. The maximum adsorption capacities of Cu(II) and Cd(II) were calculated as 8.64 and 11.29 mg/g for single and 6.65 and 2.59 mg/g for binary systems, respectively. Batch adsorption studies were carried out for evaluating the suitability of tea factory waste as a low-cost adsorbent for the removal of zinc [121]. The effects of various parameters like pH, adsorbent dose, initial concentration of zinc and temperature, on adsorption performance were studied using tea factory waste (TFW). The maximum adsorption capacity of TFW was calculated as 8.9 mg/g for Zn(II).