Competitive adsorption of Pb(II), Cu(II) and Zn(II) onto xanthate-modified.pdf

C m Y a b a A R R A A K X H A M E C 1 r a h h a t a a e I c c b o c o p T f ( 0 hJournal of Hazardous Materials 221– 222 (2012) 155– 161 Contents lists available at SciVerse ScienceDirect Journal of Hazardous Materials jou rn al h om epage: www.elsev ier .com/ loc ate / jhazmat ompetitive adsorption of Pb(II), Cu(II) and Zn(II) onto xanthate-modified agnetic chitosan ehua Zhua, Jun Hua, Jianlong Wanga,b,? Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China Beijing Key Laboratory of Fine Ceramics, Tsinghua University, Beijing 100084, PR China r t i c l e i n f o rticle history: eceived 21 January 2012 eceived in revised form 9 April 2012 ccepted 10 April 2012 vailable online 19 April 2012 a b s t r a c t The competitive adsorption of Pb(II), Cu(II) and Zn(II) onto a novel xanthate-modified magnetic chitosan (XMCS) was systematically investigated in single and ternary metal systems. In single system, equilib- rium studies showed that the adsorption of Pb(II), Cu(II) and Zn(II) followed the Langmuir model and the maximum adsorption capacities were found to be 76.9, 34.5 and 20.8 mg/g, respectively. In ternary system, the combined action of the metals was found to be antagonistic and the metal sorption followed the order of Pb(II) Cu(II) Zn(II); the Langmuir isotherm fitted the data of Pb(II) and Cu(II) well while theeywords: anthate-modified magnetic chitosan eavy metal dsorption agnetic chitosan quilibrium isotherm data of Zn(II) correlated well with the Freundlich model. The Fourier transform infrared spec- troscopy (FTIR) and X-ray photoelectron spectra (XPS) studies showed that the thiol and amino group participated in the adsorption of Pb(II), Cu(II) and Zn(II). ? 2012 Elsevier B.V. All rights reserved.ompetitive adsorption . Introduction Toxic heavy metal pollution is one of