'Materials + Technology' Group, Engineering School of Gipuzkoa, Department of Chemical and Environmental Engineering, University of the Basque Country (UPV/EHU), Pza. Europa 1, 20018, Donostia - San Sebastián, Spain.
Faculty of Engineering, Department of Chemical and Environmental Engineering, University of the Basque Country (UPV/EHU), Alameda Urquijo Street s/n, 48013, Bilbao, Spain.
Carbohydr Polym. 2018 Aug 1;193:362-372. doi: 10.1016/j.carbpol.2018.04.007. Epub 2018 Apr 4.
This study has been carried out to design novel, environmentally friendly membranes by in situ and ex situ routes based on bacterial cellulose (BC) as a template for the chitosan (Ch) as functional entity for the elimination of copper in wastewaters. Two routes led to bionanocomposites with different aspect and physico-chemical properties. The mechanical behaviour in wet state, strongly related to crystallinity and water holding capacity, resulted to be very different depending on the preparation route although the Ch content was very similar: 35 and 37 wt% for the in situ and ex situ membranes, respectively. The morphological characterization suggested a better incorporation of the Ch into BC matrix through the in situ route. The cooper removal capacity of these membranes was analyzed and in situ prepared membrane showed the highest values, about 50%, for initial concentrations of 50 and 250 mg L. Moreover the reusability of the membranes was assessed. This is the first time that the whole 3D nano-network BC membrane is used to provide physical integrity for chitosan to develop eco-friendly membranes with potential applications in heavy metal removal.
本研究旨在通过原位和异位途径设计新型环保膜，以细菌纤维素（BC）为模板，壳聚糖（Ch）为功能实体，用于去除废水中的铜。两种途径导致了具有不同形态和物理化学性质的生物纳米复合材料。湿态下的力学性能与结晶度和持水能力密切相关，尽管 Ch 的含量非常相似（分别为原位和异位膜的 35 和 37wt%），但其结果却大不相同：原位和异位膜分别为 35 和 37wt%。形态特征表明，通过原位途径可以更好地将 Ch 掺入 BC 基质中。分析了这些膜的铜去除能力，原位制备的膜在初始浓度为 50 和 250mg/L 时表现出最高值，约为 50%。此外，还评估了膜的可重复使用性。这是第一次使用整个 3D 纳米网络 BC 膜为壳聚糖提供物理完整性，以开发具有去除重金属潜在应用的环保膜。
