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Department of Chemistry, Department of Chemical Engineering, MVGR College of Engineering (A), Vizianagaram-535 002, Andhra Pradesh, India E-mail: prs_ganti@yahoo.co.in Manuscript received 19 January 2018, revised 20 February 2018, accepted 26 February 2018 Two low cost bio adsorbents such as corn cob (CC) and Strychnouspotatorum seed powder (SPSP) were used for the removal of copper(II) and manganese(II) from industrial waste water and presented in this paper. Raw powders of the two adsorbents were prepared and used for the study. Batch adsorption experimentation was adopted to investigate the adsorption kinetics, isothermal studies and removal efficiency of the two adsorbents. Effect of pH, contact time, initial metal concentration and temperature were also studied. Adsorption of copper(II) and manganese(II) was optimized at a pH of 5, temperature of 40ºC, in a time period of 60 min using the two adsorbents. By using CC and SPSP as adsorbents 99.7% of copper(II) and 99.8% of manganese(II) were removed. This was achieved by using 0.4 g dosage of the adsorbents. Removal of copper(II) and manganese(II) followed pseudo-second order reaction kinetics. Isothermal studies indicated that the removal the selected heavy metals follows Langmuir adsorption isotherm model. Maximum adsorption capacity was found to be 6.24 mg/g for the two adsorbents. These adsorbents were found to be advantageous in removing the chosen metals from water as they avoid laborious and time consuming chemical treatment methods. Hence the method was found to be cost effective, efficient, advantageous and simple. |
