Division of Materials Science, Luleå University of Technology, 97187, Luleå, Sweden; Department of Civil, Environmental and Natural Resources Engineering, Division of Sustainable Process Engineering, 97187, Luleå, Sweden.
Division of Materials Science, Luleå University of Technology, 97187, Luleå, Sweden.
Carbohydr Polym. 2014 Nov 4;112:668-76. doi: 10.1016/j.carbpol.2014.06.048. Epub 2014 Jun 25.
Fully biobased composite membranes for water purification were fabricated with cellulose nanocrystals (CNCs) as functional entities in chitosan matrix via freeze-drying process followed by compacting. The chitosan (10 wt%) bound the CNCs in a stable and nanoporous membrane structure with thickness of 250-270 μm, which was further stabilized by cross-linking with gluteraldehyde vapors. Scanning electron microscopy (SEM) studies revealed well-individualized CNCs embedded in a matrix of chitosan. Brunauer, Emmett and Teller (BET) measurements showed that the membranes were nanoporous with pores in the range of 13-10nm. In spite of the low water flux (64 Lm(-2) h(-1)), the membranes successfully removed 98%, 84% and 70% respectively of positively charged dyes like Victoria Blue 2B, Methyl Violet 2B and Rhodamine 6G, after a contact time of 24h. The removal of dyes was expected to be driven by the electrostatic attraction between negatively charged CNCs and the positively charged dyes.
采用冷冻干燥法结合压实处理，以纤维素纳米晶体（CNC）为功能实体，在壳聚糖基体中制备了用于水净化的全生物基复合膜。壳聚糖（10wt%）将 CNC 束缚在具有 250-270μm 厚的稳定纳米多孔膜结构中，通过戊二醛蒸气交联进一步稳定。扫描电子显微镜（SEM）研究表明，CNC 很好地嵌入壳聚糖基体中。Brunauer-Emmett-Teller（BET）测量表明，膜具有纳米多孔性，孔径在 13-10nm 范围内。尽管水通量较低（64Lm(-2)h(-1)），但在 24 小时接触时间后，这些膜成功地分别去除了 98%、84%和 70%的带正电荷的染料，如维多利亚蓝 2B、甲紫 2B 和罗丹明 6G。染料的去除预计是由带负电荷的 CNC 与带正电荷的染料之间的静电吸引驱动的。
