Chitosan film, Spirulina sp. film and its blend were developed as biosorbents to remove Cr6+ and Pb2+ ions from aqueous solutions. The kinetic study and the pH effect on biosorption efficiency were evaluated to comprehend the interactions between the ions and biosorbents. The characterization analyses pointed out that occurred interaction between both biomaterials, which resulted in structural alterations through the blend. The Spirulina sp. film exhibited the highest biosorption capacities for Cr6+ (43.2 mg g-1) and Pb2+ (35.6 mg g-1) ions, however, its physical integrity was not kept in acid medium. The blend film showed results slightly lower (35.8 mg g-1 for Cr6+ and 31.6 mg g-1 for Pb2+), but its physical integrity remained intact in all assays. Chitosan film presented the lower biosorption capacities (15.4 mg g-1 for Cr6+ and 20.9 mg g-1 for Pb2+). Elovich and pseudo-second order models were the most suitable to express the kinetic behaviors for Cr6+ and Pb2+, respectively. Therefore, chitosan/Spirulina sp. blend could be a green alternative for Cr6+ and Pb2+ removal, because this biosorbent showed high biosorption capacity obtained from Spirulina sp. and great physical integrity obtained of chitosan.

中文翻译：

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壳聚糖/螺旋藻sp。混合薄膜作为生物吸附剂以去除Cr6 +和Pb2 +。

壳聚糖膜，螺旋藻 该膜及其混合物被开发为生物吸附剂，用于从水溶液中去除Cr6 +和Pb2 +离子。评估了动力学研究和pH对生物吸附效率的影响，以了解离子与生物吸附剂之间的相互作用。表征分析指出，两种生物材料之间都发生了相互作用，这导致了共混物的结构改变。螺旋藻 膜对Cr6 +（43.2 mg g-1）和Pb2 +（35.6 mg g-1）离子具有最高的生物吸附能力，但是，其物理完整性并未在酸性介质中保持。共混膜显示的结果略低（Cr6 +为35.8 mg g-1，Pb2 +为31.6 mg g-1），但其物理完整性在所有测定中均保持不变。壳聚糖薄膜的生物吸附能力较低（Cr6 +和20的Cr1 +为15.4 mg g-1）。Pb2 +为9 mg g-1）。Elovich模型和伪二级模型最适合分别表示Cr6 +和Pb2 +的动力学行为。因此，壳聚糖/螺旋藻属。共混物可能是去除Cr6 +和Pb2 +的绿色替代品，因为这种生物吸附剂显示出从螺旋藻中获得的高生物吸附能力。并获得了良好的壳聚糖物理完整性。