LIMAV, Center for Natural Sciences, Federal University of Piauí, 64049-550 Teresina, Piauí, Brazil.
Carbohydr Polym. 2013 Feb 15;92(2):1203-10. doi: 10.1016/j.carbpol.2012.10.031. Epub 2012 Oct 17.
Cellulose (Cel) was first chemically modified with thionyl chloride to increase its reactivity. In the next step CelCl was reacted with ethylenediamine (CelEn) and subsequently reacted with ethylene sulfide to obtain a solid substance, CelEnEs. The modification reactions were confirmed by elemental analysis, TG, XRD, (13)C NMR and FTIR. The chemically modified biopolymer CelEnEs had an order of divalent metal sorption of Pb(2+)>Cd(2+)>Ni(2+)>Co(2+)>Cu(2+)>Zn(2+), and the maximum adsorption capacities were found to be 6.282±0.023, 5.783±0.015, 5.561±0.017, 4.694±0.013, 1.944±0.062 and 1.733±0.020 mmol g(-1), respectively. The equilibrium data were fitted to Langmuir, Freundlich and Temkin models, and in general, the experimental data best fit the Freundlich model. This newly synthesized biopolymer proved to be a chemically useful material for cations removal from aqueous solution.
纤维素（Cel）首先用氯化亚砜进行化学改性，以提高其反应性。在下一步中，CelCl 与乙二胺（CelEn）反应，然后与乙硫醇反应，得到一种固体物质 CelEnEs。通过元素分析、TG、XRD、（13）C NMR 和 FTIR 确认了改性反应。化学改性的生物聚合物 CelEnEs 对二价金属的吸附顺序为 Pb(2+)>Cd(2+)>Ni(2+)>Co(2+)>Cu(2+)>Zn(2+)，最大吸附容量分别为 6.282±0.023、5.783±0.015、5.561±0.017、4.694±0.013、1.944±0.062 和 1.733±0.020 mmol g(-1)。平衡数据拟合了 Langmuir、Freundlich 和 Temkin 模型，通常，实验数据最好拟合 Freundlich 模型。这种新合成的生物聚合物被证明是一种从水溶液中去除阳离子的化学有用材料。
