naa a22 4500 510749453 CHVBK 20180411083059.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11270-013-1662-6 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1662-6 Competitive Adsorption of Cr (VI) and Ni (II) onto Coconut Shell Activated Carbon in Single and Binary Systems [Elektronische Daten] [Yunhai Wu, Palizhati Yilihan, Julin Cao, Yanping Jin] The comparative and competitive adsorption of Cr(VI) and Ni(II) in single and binary systems using coconut shell activated carbon (CSAC) was investigated. The CSAC was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM). The effects of pH, initial metal concentration, and temperature on the adsorption of metal ions were studied. Cr(VI) removal was found to be maximum (94.5%) at pH = 2.0. While, Ni(II) removal was found to be maximum at pH = 9.0 (58.92%). The adsorption capacity of Cr(VI) was greater than that of Ni(II) in single component system. Parameters of adsorption isotherm model, kinetics, and thermodynamics were calculated. The single ion equilibrium adsorption data were fitted to the Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models. The Langmuir and Freundlich models represented the equilibrium data better than the D-R model. The result of the fitting of D-R isotherm model indicated a physical adsorption process. The adsorption kinetic data of Cr(VI) and Ni(II) were found fitting well in pseudo second-order equation both in single and binary system (r 2 > 0.99) and intraparticle diffusion was the rate controlling step. The negative ΔG° and the positive ΔH° indicated the spontaneous and endothermic nature of the adsorption process. The extended Langmuir isotherm model fitted well with the competitive adsorption data of Cr(VI) and Ni(II). For the desorption experiments, EDTA showed the maximum desorption efficiency of 69% for Cr(VI) and 81% for Ni(II). Springer Science+Business Media Dordrecht, 2013 Binary system nationallicence Coconut shell activated carbon nationallicence Desorption nationallicence Isotherm nationallicence Kinetics nationallicence Wu Yunhai Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Ministry of Education, Hohai University, 210098, Nanjing, China aut Yilihan Palizhati College of Environment, Hohai University, 210098, Nanjing, China aut Cao Julin College of Environment, Hohai University, 210098, Nanjing, China aut Jin Yanping College of Environment, Hohai University, 210098, Nanjing, China aut Water, Air, & Soil Pollution Springer Netherlands 224/9(2013-09-01), 1-13 0049-6979 224:9<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1662-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1662-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wu Yunhai Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Ministry of Education, Hohai University, 210098, Nanjing, China aut NATIONALLICENCE 700 1- Yilihan Palizhati College of Environment, Hohai University, 210098, Nanjing, China aut NATIONALLICENCE 700 1- Cao Julin College of Environment, Hohai University, 210098, Nanjing, China aut NATIONALLICENCE 700 1- Jin Yanping College of Environment, Hohai University, 210098, Nanjing, China aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/9(2013-09-01), 1-13 0049-6979 224:9<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer