The effect of contact time on removal of Cu (II) by GAC. The adsorption of 8-hydroxyquinoline Copper(WSDTY) was found to increase with increase in contact time for a fixed adsorbate dosage and fixed concentration of copper ions and the removal in mg of Cu/g of carbon increases with time and attains equilibrium in 4 hrs for GAC for an initial Cu (II) concentration of 5.68 mg/l. Initially adsorption is rapid due to external surface adsorption of copper which occurs instantaneously and later on becomes slower once equilibrium uptake was achieved. A comparative account does not show any significant difference in the effect of contact time.
For the experimental runs an optimum speed of 800 rpm was maintained for both the ligands. At higher speed of 1200 rpm, the diffusion coefficient of metal ions was significantly affected as the energy due to high speed probably assisted in breaking bonds formed between metal ion and their adsorbent. At lower speed of 500 rpm the degree of mixing reduces. The maximum removal efficiency was 90.14% for QSA and 94.19% for NQSA loaded GAC-Cu system at 800 rpm.
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