Chitosan- magnetite

Chitosan/magnetite nano composite beads have the maximum adsorption capacities for Pb(ll), and Ni(ll) at pH 6 under room temperatirre which were as high as 63.33 and 52.55 mg/g respectively. Chitosan magnetite nano composite beads could serve a promising adsorbent not only for Pb(II) and Ni(II) but also for other heavy metal ions in wastewater treatment technology (Hoang finh Tran et al., 2010). 

Tran HV, Tran LD, Nguyen TN [2010]. Preparation of chitosan/magnetite composite beads and their appiication for removai of Pb[II] and Ni[II] from aqueous solution. Mater Sci Eng, 30, 304-310. 

Namdeo, M Bajpai, SK. Chitosan-magnetite nanocomposites (CMNs) as magnetic carrier particles for removal of Fe (HI) from aqueous solutions. Colloids and Surfaces A Physicochem. Eng. Aspects, 2008, 320,161-168. 

Chitosan coated carbon was evaluated for the removal of chromium (VI) and cadmium (II) from its aqueous solution [177]. The application of chitosan in the form of beads to the removal of copper, zinc and chromium ions from water was reported by Katarzyna Jaros et al. (2005). The composite chitosan magnetite microparticles for the removal of Co and Ni ions in aqueous solution have been evaluated by Donia Hitchu et al. (2012). The adsorption of Cu on the chitin surface has been studied by Melchor Gonzalez-Davila and Frank J. Millero (1989). The maximum adsorption of the chitosan beads for the removal of formaldehyde and ammonia were in the order of those derived from cuttlefish bone, white leg shrimp, horseshoe crab and mud crab, respectively [172]. The adsorption of chromium (VI) ions from aqueous... 

Doina Hritcu, Gianina Dodi, Marcel lonel Popa. Heavy Metal Ions Adsorption on Chitosan-Magnetite Microspheres. International Review of Chemical Engineering. 2012,4, 364-368. 

Fig. 5.13 Chitosan magnetic nanoparticles (A) TEM micrograph, (B) magnetization hysteresis loops for chitosan and magnetite-loaded chitosan particles. (Reprinted from [68], Copyright (2006), with permission from Elsevier).

Yang, P.-F. and Lee, C.-K., Hyaluronic acid interaction with chitosan-conjugated magnetite particles and its purification, Biochem.Eng.. ., 33, 284, 2007. 

Fig. 10. FT spectra of magnetite coated with a chitosan shell.

Wang Y, Li B, Zhou Y et al (2011) New generation of chitosan-(acrylic acid)-magnetite nanospheres synthesis, characterization and cell viability test in vitro. J Control Release 152 e245-e246... 

Chitosan-g-NIPAM-co-N, N-dimethylacrylamide nano carrier encapsulating magnetite core (Fe O ) coupled with a drug via an acid-labile hydrazone bond It showed thermoresponsive behavior with a LCST of 38°C and faster drug release at pH 5.3. [32]... 

Q. Yuan, R. Venkatasubramanian, S. Hein, and R. Misra, A stimulus-responsive magnetic nanoparticle drug carrier Magnetite encapsulated by chitosan-grafted-copolymer, Acta Biomaterialia, 4 (4), 1024-1037, 2008. 

In a number of cases, PAMAM dendrons were also prepared on other polymer particle cores, such as alumina, chitosan, cellulose, zirconia-urea-formaldehyde resin, silica-coated magnetite, and carbon nanotubes. Like the silica support (see above), at least in the case of the chitosan, the theoretically predicted propagation of the dendrons was not achieved, presumably due to the steric hindrance in the support pores. 

Wang, Y., Li, B., Zhou, Y., Jia, D., 2008. Chitosan-induced synthesis of magnetite nanoparticles via iron ions assembly. Advances in Polymer Technology 19, 1256—1261. 

Figure 2.12 The procedure for monodisperse magnetite nanoparticles via chitosan-poly(acrylic acid) template [22].

A composite adsorbent was prepared by entrapping crosslinked chitosan and nano-magnetite (NMT) on heulandite (HE) surface to remove Cu(II) and As(V) in aqueous solution [47], Recently, chitosan composites have been developed to adsorb heavy metals and dyes from wastewater. A series of polyurethane (PU)/chitosan composite foams were prepared with different chitosan content of 5 20 wt.% and investigated their adsorption performance of acid dye (Acid Violet 48) [74], The adsorption of lead (II) from aqueous solutions onto ehitosan was investigated [46]. Chitosan can be modeled in several shapes gels, flakes, powders, beads, membranes and particles. 

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