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The online version of this article (doi:10.1007/s00396-016-3893-8) contains supplementary material, which is available to authorized users.
1. Carboxymethyl chitosan-conjugated Fe3O4 nanoparticles, CMCS-MNPs, were synthesized.
2. CMCS-MNPs are an effective sorbent for the removal of Pb(II) from solution.
3. A sorbent effect (C s-effect) was observed for Pb(II) sorption on the CMCS-MNPs.
4. The C s-effect could be described using the Langmuir-SCA and Freundlich-SCA models.
5. The pH, electrolyte, and temperature had no obvious influence on the C s-effect.
6. Pb(II) sorption on the CMCS-MNPs is spontaneous and exothermic in nature.
Carboxymethyl chitosan (CMCS)-conjugated magnetite (Fe3O4) nanoparticles (MNPs), which are denoted as CMCS-MNPs, were synthesized by covalently binding CMCS onto the surface of the MNPs via carbodiimide activation in a paraffin-acetic acid medium. The CMCS-MNPs exhibited a high level of CMCS binding (∼24.7 wt.%) and a spherical morphology with a mean diameter of 15 nm. In particular, they showed good water dispersity and a strong magnetic response. The sorption of Pb(II) on the CMCS-MNPs in aqueous solutions at different sorbent dosages (C s), pH, electrolyte (NaNO3) concentrations (C NaNO3), and temperatures (T) was investigated. The CMCS-MNPs showed high sorption capacity for Pb(II). The equilibrium amount increased with increasing pH but decreased with increasing C NaNO3 or T. In addition, a significant C s-effect was observed in the sorption equilibria. Two C s-dependent models, the Langmuir-SCA and Freundlich-SCA isotherms that were derived from a surface component activity (SCA) model, could describe the C s-effect observed. The changes in pH, C NaNO3, and T have no obvious influence on the C s-effect. In addition, the changes in the thermodynamic parameters, ∆G°, ∆H°, and ∆S°, for sorption were estimated, showing that the sorption process is spontaneous and exothermic.
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Schwarzenbach RP, Escher BI, Fenner K, Hofstetter TB, Johnson CA, Von Gunten U, Wehrli B (2006) The challenge of micropollutants in aquatic systems. Science 313:1072–1077 CrossRef
Ngah WSW, Teong LC, Hanafiah M (2011) Adsorption of dyes and heavy metal ions by chitosan composites: a review. Carbohydr Polym 83:1446–1456 CrossRef
Reddy DHK, Lee S-M (2013) Application of magnetic chitosan composites for the removal of toxic metal and dyes from aqueous solutions. Adv Colloid Interface Sci 201:68–93 CrossRef
Nguyen TAH, Ngo HH, Guo WS, Zhang J, Liang S, Yue QY, Li Q, Nguyen TV (2013) Applicability of agricultural waste and by-products for adsorptive removal of heavy metals from wastewater. Bioresour Technol 148:574–585 CrossRef
Li Y-H, Wang S, Wei J, Zhang X, Xu C, Luan Z, Wu D, Wei B (2002) Lead adsorption on carbon nanotubes. Chem Phys Lett 357:263–266 CrossRef
Zhao G, Ren X, Gao X, Tan X, Li J, Chen C, Huang Y, Wang X (2011) Removal of Pb (II) ions from aqueous solutions on few-layered graphene oxide nanosheets. Dalton Trans 40:10945–10952 CrossRef
Madadrang CJ, Kim HY, Gao G, Wang N, Zhu J, Feng H, Gorring M, Kasner ML, Hou S (2012) Adsorption behavior of EDTA-graphene oxide for Pb (II) removal. ACS Appl Mater Interfaces 4:1186–1193 CrossRef
Sheindorf CH, Rebhun M, Sheintuch M (1981) A Freundlich-type multicomponent isotherm. J Colloid Interface Sci 79:136–142 CrossRef
Pan G, Liss PS (1998) Metastable-equilibrium adsorption theory: I. Theoretical. J Colloid Interface Sci 201:71–76 CrossRef
O’Connor DJ, Connolly JP (1980) The effect of concentration of adsorbing solids on the partition coefficient. Water Res 14:1517–1523 CrossRef
Voice TC, Weber WJ (1985) Sorbent concentration effects in liquid/solid partitioning. Environ Sci Technol 19:789–796 CrossRef
Di Toro DM, Mahony JD, Kirchgraber PR, O’Byrne AL, Pasquale LR, Piccirilli DC (1986) Effects of nonreversibility, particle concentration, and ionic strength on heavy-metal sorption. Environ Sci Technol 20:55–61 CrossRef
Helmy AK, Ferreiro EA, De Bussetti SG (2000) Effect of particle association on 2, 2′-bipyridyl adsorption onto kaolinite. J Colloid Interface Sci 225:398–402 CrossRef
Chang TW, Wang MK (2002) Assessment of sorbent/water ratio effect on adsorption using dimensional analysis and batch experiments. Chemosphere 48:419–426 CrossRef
Fehse K-U, Borg H, Sorkau E, Pilchowski K, Luckner L (2010) Correcting the effect of the sorbent to solution ratio on sorption isotherms from batch tests with soils and sediments. Water Air Soil Pollut 210:211–220 CrossRef
Guo Y, Hou W, Liang J, Liu J (2014) Sorbent concentration effect on adsorption of methyl orange on chitosan beads in aqueous solutions. Chem Res Chin Univ 30(5):837–843 CrossRef
Zhang F, Du N, Li H, Song S, Hou W (2015) Sorbent effect on the sorption of Cr (VI) on a Mg 6AlFe-layered double hydroxide and its calcined product in aqueous solutions. Colloid Polym Sci 293:1961–1969 CrossRef
Zhang F, Du N, Song S, Hou W (2015) Mechano-hydrothermal synthesis of SDS intercalated LDH nanohybrids and their removal efficiency for 2,4-dichlorophenoxyacetic acid from aqueous solution. Mater Chem Phys 152:95–103 CrossRef
Zhang F, Song Y, Song S, Zhang R, Hou W (2015) Synthesis of magnetite–graphene oxide-layered double hydroxide composites and applications for the removal of Pb (II) and 2, 4-dichlorophenoxyacetic acid from aqueous solutions. ACS Appl Mater Interfaces 7:7251–7263 CrossRef
Zhao L-X, Hou W-G (2012) The effect of sorbent concentration on the partition coefficient of pollutants between aqueous and particulate phases. Colloids Surf A Physicochem Eng Asp 396:29–34 CrossRef
Zhao L-X, Song S-E, Du N, Hou W-G (2013) A sorbent concentration-dependent Freundlich isotherm. Colloid Polym Sci 291:541–550 CrossRef
Zhao L-X, Song S-E, Du N, Hou W-G (2012) A sorbent concentration-dependent Langmuir isotherm. Acta Phys-Chim Sin 28:2905–2910
Chang Y-C, Chen D-H (2005) Preparation and adsorption properties of monodisperse chitosan-bound Fe 3O 4 magnetic nanoparticles for removal of Cu (II) ions. J Colloid Interface Sci 283:446–45 CrossRef
Chang YC, Chen DH (2005) Adsorption kinetics and thermodynamics of acid dyes on a carboxymethylated chitosan–conjugated magnetic nano–adsorbent. Macromol Biosci 5:254–261 CrossRef
Li G-y, Huang K-l, Jiang Y-r, Ding P, Yang D-l (2008) Preparation and characterization of carboxyl functionalization of chitosan derivative magnetic nanoparticles. Biochem Eng J 40:408–414 CrossRef
Kuang S-P, Wang Z-Z, Liu J, Wu Z-C (2013) Preparation of triethylene-tetramine grafted magnetic chitosan for adsorption of Pb (II) ion from aqueous solutions. J Hazard Mater 260:210–219 CrossRef
Mi F-L, Wu S-J, Chen Y-C (2015) Combination of carboxymethyl chitosan-coated magnetic nanoparticles and chitosan-citrate complex gel beads as a novel magnetic adsorbent. Carbohydr Polym 131:255–263 CrossRef
Nasirimoghaddam S, Zeinali S, Sabbaghi S (2015) Chitosan coated magnetic nanoparticles as nano-adsorbent for efficient removal of mercury contents from industrial aqueous and oily samples. J Ind Eng Chem 27:79–87 CrossRef
Muzzarelli RAA (2011) Potential of chitin/chitosan-bearing materials for uranium recovery: an interdisciplinary review. Carbohydr Polym 84:54–63 CrossRef
Hu X-j, Wang J-s, Liu Y-g, Li X, Zeng G-m, Bao Z-l, Zeng X-x, Chen A-w, Long F (2011) Adsorption of chromium (VI) by ethylenediamine-modified cross-linked magnetic chitosan resin: isotherms, kinetics and thermodynamics. J Hazard Mater 185:306–314 CrossRef
Liao M-H, Chen D-H (2002) Preparation and characterization of a novel magnetic nano-adsorbent. J Mater Chem 12:3654–3659 CrossRef
Chen X-G, Park H-J (2003) Chemical characteristics of O-carboxymethyl chitosans related to the preparation conditions. Carbohydr Polym 53:355–359 CrossRef
Yang J-H, Du Y-M, Qin C-Q (2003) Applications of infrared spectroscopy and nuclear magnetic resonance spectroscopy in the studies of the structure of chitin and chitosan. J Anal Sci 19:282–287
Guang G, Wu Z (2004) Structure and properties of carboxymethyl chitin. Polym Mater Sci Eng 20:107–110
- Sorption of Pb(II) on carboxymethyl chitosan-conjugated magnetite nanoparticles: application of sorbent dosage-dependent isotherms
- Springer Berlin Heidelberg
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