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Title	en Preparation and characterization of chitosan–caboxymethyl-β-cyclodextrin entrapped nanozero-valent iron composite for Cu (II) and Cr (IV) removal from wastewater
Creator	en Sikder, Md. Tajuddin en Mihara, Yoshihiro en Islam, Md. Shariful en Saito, Takeshi NRID 1000040153811 en Tanaka, Shunitz NRID 1000030142194 en Kurasaki, Masaaki NRID 1000080161727
Accessrights	open access
Subject	Other en Chitosan Other en Zero-valent iron Other en Remediation Other en Cyclodextrin polymer Other en Heavy metal Other en Water pollution NDC 579
Description	Abstract en The entrapment of Fe0 nanoparticles within a chitosan–carboxymethyl β-cyclodextrin complex, a nontoxic and biodegradable stabilizer, yields chitosan–Fe0 nanoparticle–carboxymethyl β-cyclodextrin beads that are 2.5 mm in diameter and contain 50% iron by weight. The complete disappearance of Cr (VI) and Cu (II) may involve both physical adsorption and reduction of Cr (VI) to Cr (III) and Cu (II) to Cu (0) while oxidizing Fe0 to Fe (III). The rate of reduction can be expressed by pseudo-second-order reaction kinetics. The rate constants increased with increasing iron loading and initial concentration at pH 6, while the adsorption of Cr (VI) and Cu (II) was found to be endothermic and exothermic, respectively. The apparent activation energies for Cr (VI) and Cu (II) were found to be 71.99 and 18.38 kJ mol−1, respectively. X-ray photoelectron spectroscopy confirmed the reduction process. The equilibrium data could be well described by both Langmuir and Temkin isotherms for describing monolayer adsorption and chemisorption processes, respectively. Both film diffusion and intraparticle diffusion were found to be the rate-limiting steps from the analysis of an intraparticle diffusion model. Thus, the synthesized chitosan–Fe0-nanoparticle–carboxymethyl β-cyclodextrin beads can be a potential material for in situ remediation of contaminated surface and ground water.
Publisher	en Elsevier, B.V.
Date	Issued2014-01-15
Language	eng
Resource Type	journal article
Version Type	AM
Identifier	HDL http://hdl.handle.net/2115/53586
Relation	URI http://www.sciencedirect.com/science/article/pii/S1385894713012977 isVersionOf DOI https://doi.org/10.1016/j.cej.2013.09.093
Journal	PISSN 1385-8947 NCID AA11095026 en Chemical Engineering Journal Volume Number236 Page Start378 Page End387
File	fulltext Fig. 9.jpg 165.25 KB (image/jpeg) Issued2014-01-15 fulltext Fig.1new.pdf 574.93 KB (application/pdf) Issued2014-01-15 fulltext Fig.2new.pdf 320.45 KB (application/pdf) Issued2014-01-15 fulltext Fig.3 new.pdf 212.79 KB (application/pdf) Issued2014-01-15 fulltext Fig.4new.pdf 218.3 KB (application/pdf) Issued2014-01-15 fulltext Fig.5new.pdf 280.26 KB (application/pdf) Issued2014-01-15 fulltext Fig.6new.pdf 173.27 KB (application/pdf) Issued2014-01-15 fulltext Fig.7new.pdf 169.15 KB (application/pdf) Issued2014-01-15 fulltext Fig.8new.pdf 177.55 KB (application/pdf) Issued2014-01-15 fulltext Highlights.pdf 16.14 KB (application/pdf) Issued2014-01-15 fulltext Revised Manuscript.pdf 167.14 KB (application/pdf) Issued2014-01-15 fulltext Table 1 Different adsorbent.pdf 20.58 KB (application/pdf) Issued2014-01-15 fulltext Table 2. Comparative analysis.pdf 20.31 KB (application/pdf) Issued2014-01-15
Oaidate	2023-07-26