caa a22 4500 606195572 CHVBK 20210128100920.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s10934-015-9983-z doi (NATIONALLICENCE)springer-10.1007/s10934-015-9983-z Rapid and efficient magnetically removal of heavy metals by magnetite-activated carbon composite: a statistical design approach [Elektronische Daten] [Ali Azari, Babak Kakavandi, Roshanak Kalantary, Ehsan Ahmadi, Mitra Gholami, Zahra Torkshavand, Minoo Azizi] This study investigates the efficiency of the magnetite-powder activated carbon (M-PAC) to removal of Ni2+, Co2+ and Cd2+ ions from the aqueous solution. Response surface methodology based on the Box-Behnken design was used to evaluate the effects of independent variables such as pH, contact time, adsorbent dosage, temperature and initial concentration of metal ions on the response function and prediction of the best response values. The adsorption fitted best to the Langmuir model indicating the presence of heterogeneous sites for Ni2+, Co2+ and Cd2+ ions adsorption. The kinetics results demonstrated the adsorption process well suited with pseudo-second-order model, indicating that it was involves the formation of valency forces through the exchange or sharing of electrons between metal ions and the binding sites of M-PAC. The intraparticle diffusion model showed a low linear relationship (R2<0.87), which suggests that pore diffusion is not the rate-limiting step in the adsorption process. The values of thermodynamic parameters (ΔG°, ΔS° and ΔH°) showed that the adsorption of all studied metal ions onto M-PAC was spontaneous, feasible and endothermic. Based on these findings, it is concluded that the M-PAC could be successfully employed for adsorption of heavy metals due to simple and rapid separation and high capacity. Springer Science+Business Media New York, 2015 Adsorption nationallicence Heavy metals nationallicence Magnetic separation nationallicence Response surface methodology nationallicence Azari Ali Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran aut Kakavandi Babak Department of Environmental Health Engineering, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran aut Kalantary Roshanak Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, P. O. Box: 6446-14155, 1471613151, Tehran, Iran aut Ahmadi Ehsan Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran aut Gholami Mitra Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, P. O. Box: 6446-14155, 1471613151, Tehran, Iran aut Torkshavand Zahra Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran aut Azizi Minoo Department of Environmental Health Engineering, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran aut Journal of Porous Materials Springer US; http://www.springer-ny.com 22/4(2015-08-01), 1083-1096 1380-2224 22:4<1083 2015 22 10934 https://doi.org/10.1007/s10934-015-9983-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10934-015-9983-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Azari Ali Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran aut NATIONALLICENCE 700 1- Kakavandi Babak Department of Environmental Health Engineering, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran aut NATIONALLICENCE 700 1- Kalantary Roshanak Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, P. O. Box: 6446-14155, 1471613151, Tehran, Iran aut NATIONALLICENCE 700 1- Ahmadi Ehsan Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran aut NATIONALLICENCE 700 1- Gholami Mitra Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, P. O. Box: 6446-14155, 1471613151, Tehran, Iran aut NATIONALLICENCE 700 1- Torkshavand Zahra Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran aut NATIONALLICENCE 700 1- Azizi Minoo Department of Environmental Health Engineering, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran aut NATIONALLICENCE 773 0- Journal of Porous Materials Springer US; http://www.springer-ny.com 22/4(2015-08-01), 1083-1096 1380-2224 22:4<1083 2015 22 10934