Nonwoven Membrane Supports from Renewable Resources: Bamboo Fiber Reinforced Poly(Lactic Acid) Composites
Nonwoven Membrane Supports from Renewable Resources: Bamboo Fiber Reinforced Poly(Lactic Acid) Composites
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DOI：
10.1021/acssuschemeng.9b02516
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发表时间：
2019-07-01
影响因子：
8.4
通讯作者：
Szekely, Gyorgy
中科院分区：
文献类型：
--
作者：
Hai Anh Le Phuong;Ayob, Nor Amira Izzati;Szekely, Gyorgy
膜分离技术作为一种高效节能的技术，已被广泛认可，并具有快速增长的市场。然而，由于目前的制造方法使用有毒溶剂和不可降解的石油基聚合物，这种增长引起了对可持续性的担忧。解决这些挑战的重点一直是通过可再生材料的膜的活性层，而同样重要的膜支持还没有变成绿色。在这里，我们报告的制造可持续的，可生物降解的，非织造复合膜支持由三种可再生材料：竹纤维，聚乳酸（PLA），和碳酸二甲酯。生物基膜支撑体表现出多孔结构（孔隙率为0.719 +/-0.132），其拉伸强度（32.7- 73.3MPa）与常规材料如聚丙烯相当。用激光扫描共聚焦显微镜观察了载体的微观结构和孔隙率。竹子含量的增加导致机械稳定性增加，溶胀减少，渗透性提高，在水中高达1068 +/- 32 L m（-2）h（-1）bar（-1）。在筛选的25种有机溶剂中的19种中验证了膜支持物的长期化学稳定性。特别地，发现它们在一些常规和新兴的绿色极性非质子溶剂中是稳定的，所述溶剂包括芘、2-甲基四氢呋喃、γ-戊内酯和碳酸丙烯酯。成功证明了2周以上稳定的错流过滤性能。结果表明，竹/聚乳酸膜支持可以提供一个可持续的替代传统的膜背衬材料，消除了对石油基不可降解的聚合物和有毒溶剂的需要。
Membrane separation has been widely recognized as an energy-efficient technology with a rapidly growing market. However, such growth raises concerns about sustainability due to current fabrication methods that employ toxic solvents and nondegradable petroleum-based polymers. The focus of tackling these challenges has been on the active layer of membranes via renewable materials, while the equally important membrane supports are yet to turn green. Herein we report the fabrication of sustainable, biodegradable, nonwoven composite membrane supports made from three renewable materials: bamboo fiber, poly(lactic acid) (PLA), and dimethyl carbonate. The biobased membrane supports exhibited a porous structure (porosity of 0.719 +/- 0.132) with tensile strengths (32.7-73.3 MPa) comparable to conventional materials, such as polypropylene. The microstructure and porosity of the supports were revealed by laser scanning confocal microscopy. The increase in bamboo content resulted in increased mechanical stability, decreased swelling, and enhanced permeance, up to 1068 +/- 32 L m(-2) h(-1) bar(-1) in water. The long-term chemical stability of membrane supports was verified in 19 of the 25 organic solvents screened. In particular, they were found to be stable in some conventional and emerging green polar aprotic solvents including Cyrene, 2-methyltetrahydrofuran, gamma-valerolactone, and propylene carbonate. Stable cross-flow filtration performance over 2 weeks was successfully demonstrated. The results demonstrated that the bamboo/PLA membrane supports could provide a sustainable alternative for conventional membrane backing materials by eliminating the need for petroleum-based nondegradable polymers and toxic solvents.