caa a22 4500 463216911 CHVBK 20180405153159.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s00226-006-0115-4 doi (NATIONALLICENCE)springer-10.1007/s00226-006-0115-4 Comparative sorption of copper and nickel from aqueous solutions by natural neem ( Azadirachta indica ) sawdust and acid treated sawdust [Elektronische Daten] [P. Srinivasa Rao, K. Suresh Reddy, S. Kalyani, A. Krishnaiah] This study investigates the potential use of neem (Azadirachta indica) sawdust treated with hydrochloric acid for the removal of copper (II) and nickel (II) ions from wastewater. The effects of different system variables, viz, adsorbent dosage, initial metal ion concentration, pH and contact time were studied. The results showed that as the amount of the adsorbent was increased, the percentage of metal ion removal increased accordingly. Optimum pH value for metal adsorption is determined as 5.0 for Cu (II) and 4.0 for Ni (II) ions. Maximum metal is sequestered in 150min for Cu (II) and 180min for Ni (II) after the beginning of every experiment. Similar experiments were carried out with acid treated sawdust to compare the results. The adsorption of metal ions followed a first order rate equation. Both Freundlich and Langmuir adsorption models are suitable for describing the sorption of Cu (II) and Ni (II) on the two forms of sawdust. Furthermore, the natural organic matter (neem sawdust) is characterized by FTIR spectra and surface area analysis. At optimal conditions the maximum adsorption capacity is found to be 48.3 and 286mg/g for Cu (II) and 31.5 and 74.1mg/g for Ni (II) in natural and acid treated forms, respectively. Springer-Verlag, 2006 Srinivasa Rao P. Biopolymers and Thermophysical Laboratories, Department of Chemistry, Sri Venkateswara University, 517 502, Tirupati, India aut Suresh Reddy K. Biopolymers and Thermophysical Laboratories, Department of Chemistry, Sri Venkateswara University, 517 502, Tirupati, India aut Kalyani S. Biopolymers and Thermophysical Laboratories, Department of Chemistry, Sri Venkateswara University, 517 502, Tirupati, India aut Krishnaiah A. Biopolymers and Thermophysical Laboratories, Department of Chemistry, Sri Venkateswara University, 517 502, Tirupati, India aut Wood Science and Technology Springer-Verlag 41/5(2007-06-01), 427-442 0043-7719 41:5<427 2007 41 226 https://doi.org/10.1007/s00226-006-0115-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00226-006-0115-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Srinivasa Rao P. Biopolymers and Thermophysical Laboratories, Department of Chemistry, Sri Venkateswara University, 517 502, Tirupati, India aut NATIONALLICENCE 700 1- Suresh Reddy K. Biopolymers and Thermophysical Laboratories, Department of Chemistry, Sri Venkateswara University, 517 502, Tirupati, India aut NATIONALLICENCE 700 1- Kalyani S. Biopolymers and Thermophysical Laboratories, Department of Chemistry, Sri Venkateswara University, 517 502, Tirupati, India aut NATIONALLICENCE 700 1- Krishnaiah A. Biopolymers and Thermophysical Laboratories, Department of Chemistry, Sri Venkateswara University, 517 502, Tirupati, India aut NATIONALLICENCE 773 0- Wood Science and Technology Springer-Verlag 41/5(2007-06-01), 427-442 0043-7719 41:5<427 2007 41 226 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer