Gutiérrez Claudia, Hansen Henrik K, Hernández Piroska, Pinilla Carolina
Departamento de Ingenieria Quimica y Ambiental, Universidad Técnica Federico Santa Maria, Avenida España 1680, Valparaiso, Chile.
Departamento de Ingenieria Quimica y Ambiental, Universidad Técnica Federico Santa Maria, Avenida España 1680, Valparaiso, Chile.
Chemosphere. 2015 Nov;138:164-9. doi: 10.1016/j.chemosphere.2015.06.002. Epub 2015 Jun 8.
Sorption experiments for cadmium removal using two brown macroalgae Lessonia nigrescens and Durvillaea antarctica were carried out. Although both types of algae were capable of retaining cadmium, differences in their performance were observed. The optimum pH was 3.7±0.2, and to achieve the equilibrium, 5 days of contact time were necessary for both biosorbents. The maximum experimental uptake obtained was similar for the two biosorbents: 95.3 mg Cd g(-1) by D. antarctica and 109.5 mg Cd g(-1) by L. nigrescens. The Langmuir model described the equilibrium sorption isotherms very well for both biosorbents and the Lagergren pseudo primer order model described the sorption kinetics for L. nigrescens satisfactorily and the Ho and Mckay pseudo second order model for D. antarctica. It was found that cadmium uptake by D. antarctica was faster than by L. nigrescens.
利用两种棕色大型海藻——黑叶马尾藻（Lessonia nigrescens）和南极巨藻（Durvillaea antarctica）进行了去除镉的吸附实验。尽管这两种藻类都能够保留镉，但观察到它们在性能上存在差异。最佳pH值为3.7±0.2，并且对于两种生物吸附剂而言，达到平衡需要5天的接触时间。两种生物吸附剂获得的最大实验吸附量相似：南极巨藻为95.3 mg Cd g(-1)，黑叶马尾藻为109.5 mg Cd g(-1)。Langmuir模型很好地描述了两种生物吸附剂的平衡吸附等温线，Lagergren准一级模型令人满意地描述了黑叶马尾藻的吸附动力学，而Ho和Mckay准二级模型则描述了南极巨藻的吸附动力学。结果发现，南极巨藻对镉的吸收比黑叶马尾藻更快。
