Department of Chemical and Biological Engineering, University of Ottawa, Canada.
Department of Chemical and Biological Engineering, University of Ottawa, Canada.
J Hazard Mater. 2021 Sep 15;418:126336. doi: 10.1016/j.jhazmat.2021.126336. Epub 2021 Jun 8.
Effects of metal ion proprieties and the cell wall structure of green alga Neochloris oleoabundans were investigated on five strategically selected heavy metal ions, Pb(II), Hg(II), Zn(II), Cd(II) and Cu(II). The biosorption of these ions were energy-independent and spontaneous Langmuir adsorption. The adsorption capacities of Pb(II), Hg(II), Zn(II), Cd(II) and Cu(II) were determined to be 1.03, 0.91, 1.20, 0.65 and 1.23 mmol/g, respectively. Data suggest that peptide-containing molecules and non-cellulosic polysaccharides on cell wall were the primary sites of adsorption. Ion Pb(II) showed the strongest inhibitive effects on the adsorption of other metal ions on cells in binaries, corresponding to its large affinity to the biosorbents, which was next only to that of Cu(II). A linear relation was established for the first time between the adsorption capacity and the impact factor, which is defined in this paper as the electronegativity of a metal ion normalized by its atomic radius. In other words, adsorption capacity of N. oleoabundans biomass to the tested two-valence metal ions is proportional to the electronegativity and inversely proportional to the radius of the metal ions. Cell aggregation was caused by the addition of Cu(II), which exhibited distinctive adsorption behaviors than other metal ions.
研究了五种战略选择的重金属离子（Pb(II)、Hg(II)、Zn(II)、Cd(II)和 Cu(II)）对绿藻 Neochloris oleoabundans 的金属离子特性和细胞壁结构的影响。这些离子的生物吸附是能量独立的和自发的朗缪尔吸附。确定 Pb(II)、Hg(II)、Zn(II)、Cd(II)和 Cu(II)的吸附容量分别为 1.03、0.91、1.20、0.65 和 1.23 mmol/g。数据表明，细胞壁上的含肽分子和非纤维素多糖是吸附的主要位点。离子 Pb(II)在二元体系中对其他金属离子在细胞上的吸附表现出最强的抑制作用，这与其对生物吸附剂的高亲和力相对应，仅次于 Cu(II)。本文首次建立了吸附容量与影响因子（定义为金属离子的电负性除以其原子半径）之间的线性关系。换句话说，N. oleoabundans 生物质对测试的两种二价金属离子的吸附容量与金属离子的电负性成正比，与金属离子的半径成反比。Cu(II)的加入引起了细胞聚集，表现出与其他金属离子不同的吸附行为。
