Water Pollution Research Department, National Research Centre, 12311 Dokki, Cairo, Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2012 Oct;96:413-20. doi: 10.1016/j.saa.2012.05.039. Epub 2012 May 24.
Possible usages of dried water hyacinth as biosorbent for metal ions were investigated. A model describing the plant is presented on density functional theory DFT and verified experimentally with FTIR. The model shows that water hyacinth is a mixture of cellulose and lignin. Dried shoot and root were found as good sorbent for Cd(II) and Pb(II) at optimum dosage of 5.0 g/l and pH 5.0; equilibrium time was attained within 30-60 min. The removal using root and shoot were nearly equal and reached more than 75% for Cd and more than 90% for Pb. Finally the second-order kinetics was the applicable model. Hydrogen bonds of reactive functional groups like COOH play the key role in the removal process.
研究了干凤眼蓝作为金属离子生物吸附剂的可能用途。在密度泛函理论（DFT）上提出了一个描述该植物的模型，并通过 FTIR 进行了实验验证。该模型表明，凤眼蓝是纤维素和木质素的混合物。在最佳剂量为 5.0 g/L 和 pH 值为 5.0 的条件下，干茎和根被发现是 Cd(II)和 Pb(II)的良好吸附剂；平衡时间在 30-60 分钟内达到。根和茎的去除率几乎相等，Cd 的去除率超过 75%，Pb 的去除率超过 90%。最后，二阶动力学是适用的模型。像 COOH 这样的反应性功能基团的氢键在去除过程中起着关键作用。
