タイトル |
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Preparation and characterization of chitosan–caboxymethyl-β-cyclodextrin entrapped nanozero-valent iron composite for Cu (II) and Cr (IV) removal from wastewater
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作成者 |
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アクセス権 |
open access |
主題 |
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Other
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Chitosan
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Other
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Zero-valent iron
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Other
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Remediation
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Other
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Cyclodextrin polymer
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Other
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Heavy metal
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Other
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Water pollution
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NDC
579
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内容注記 |
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Abstract
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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.
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出版者 |
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Elsevier, B.V.
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日付 |
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言語 |
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資源タイプ |
journal article |
出版タイプ |
AM |
資源識別子 |
HDL
http://hdl.handle.net/2115/53586
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関連 |
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URI
http://www.sciencedirect.com/science/article/pii/S1385894713012977
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isVersionOf
DOI
https://doi.org/10.1016/j.cej.2013.09.093
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収録誌情報 |
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PISSN
1385-8947
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NCID
AA11095026
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en
Chemical Engineering Journal
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巻236
開始ページ378
終了ページ387
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ファイル |
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コンテンツ更新日時 |
2023-07-26 |