Lignocellulosic materials as potential biosorbents of trace toxic metals from wastewater
Lignocellulosic materials as potential biosorbents of trace toxic metals from wastewater
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DOI：
10.1021/ie020023h
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发表时间：
2002-07-24
影响因子：
4.2
通讯作者：
Cukierman, AL
中科院分区：
文献类型：
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作者：
Basso, MC;Cerrella, EG;Cukierman, AL
以Cd(II)或Ni(II)的稀水溶液为模型，比较研究了巴西原生树种(Prosopis Ruscifolia)的石竹茎、巴西坚果壳、甘蔗渣和锯末对废水中痕量金属的吸附能力。巴西坚果壳在初始浓度为20 mg/L，剂量大于0.2-0.4 mg/L的溶液中对这两种金属的吸收效果最好(>；90%)，甚至优于相同条件下用于比较的商业活性碳和/或红藻(珊瑚目)。测定了镉在木质纤维和藻类样品上的平衡等温线，镍在坚果壳上的平衡等温线，并用Langmuir模型进行了较好的描述。在木质纤维样品中，坚果壳对Cd(II)的最大吸附容量最大(X-m=19.4 mg/g)。估算的X-m值的变化趋势与木质素和表面酸性官能团的总含量一致。然而，坚果壳的X-m低于藻类(X=29.7 mg/g)。研究还发现，与Cd(II)离子相比，坚果壳对Ni(II)离子的去除效果较差。
The potential capability of Arundo donax stems, Brazil nutshells, sugarcane bagasse, and sawdust from a. native wood species (Prosopis ruscifolia) to sequester trace metals from wastewater was comparatively examined using dilute aqueous solutions of Cd(II) or Ni(II) ions as models. Brazil nutshells showed the best effectiveness (>90%) for the uptake of both metals from solutions of 20 mg/L initial concentration for dosages larger than 0.2-0.4 mg/L, even superior to those obtained for a commercial activated carbon and/or red marine algae (Corallinales) used for comparison under identical conditions. Equilibrium isotherms of cadmium on the lignocellulosic and algae samples and of nickel on the nutshells were determined and properly described by the Langmuir model. The highest maximum sorption capacity of Cd(II) ions was obtained for the nutshells (X-m = 19.4 mg/g) among the lignocellulosic samples. The trend in the estimated X-m values was found to be consistent with their contents of lignin and total surface acidic functional groups. Nevertheless, X-m for the nutshells was lower than that for the algae (X = 29.7 mg/g). The nutshells were also found to be less effective at removing Ni(II) ions compared to Cd(II) ions.