文章基本信息

标题：Biosorption of Cu2+ by Eichhornia crassipes: Physicochemical characterization, biosorption modeling and mechanism
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作者：Zanaty R. Komy ; Zanaty R. Komy ; Wael H. Abdelraheem 等
期刊名称：Journal of King Saud University - Science
印刷版ISSN：1018-3647
出版年度：2013
卷号：25
期号：1
页码：47-56
DOI：10.1016/j.jksus.2012.04.002
语种：English
出版社：Elsevier
摘要：Abstract This work presents the biosorption potential Eichhornia crassipes biomass, collected from the Nile water, for removing Cu(II) ions. Physicochemical characteristics, proton and Cu2+ binding constants, and biosorption isotherms were studied. The biomass contains 43.3 mg g−1 protein, 40.76 mg g−1 carbohydrates and 16 types of amino acids. The biomass has large surface area (4.16 m2 g−1) and pore size (35.93 Å). Proton bindings (pK H1 = 1.8; pK H2 = 1.9; pK H3 = 2.0) and Cu2+ binding constants (pK M1 = 4.37; pK M2 = 4.24; pK M3 = 3.76) were calculated by Non-Ideal Competitive Absorption (NICA) model. FT-IR results suggested that OH, COOH and PO sites are mainly responsible for Cu2+ biosorption. Biosorption isotherms were successfully fitted by two Langmuir linearization models. The biosorption mechanism includes ionization and complexation stages. The biomass shows a breakthrough ability for Cu2+ biosorption (q max = 27.7 mg g−1) and at pH 4.5.
关键词：Biosorption; Eichhornia crassipes ; Acidic site; Modeling; Binding constants;