A known weight of tea waste adsorbent (e.g. 0.5 g adsorbent) was equilibrated with 100 ml of the
each heavy metals (namely Cu, Ni and Zn) solution of known concentration (10, 20, 50 and 100ppm) in
12 stoppered borosil glass flask at a fixed temperature (30 0C) in a orbital shaker for a known period (30–
180 Min.) of time. After equilibration, collect sample (10ml) from each flask in time interval of 30, 60,
120 and 180 minuts, the suspension of the adsorbent was separated from solution by filtration using
Whatman No. 1 filter paper.