Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Kanakapura, Ramanagara, Bangalore, 562112, India.
CSIR-Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), B.G. Marg, Bhavnagar, 364002, India.
Carbohydr Polym. 2021 Feb 15;254:117297. doi: 10.1016/j.carbpol.2020.117297. Epub 2020 Oct 23.
Replacing polyamide (PA) layer in commercially successful thin film composite (TFC) membranes prepared via interfacial polymerization has been challenging task. Lately, PA is under scrutiny due to its increasing fouling propensity for highly contaminated waters. To mitigate the bio and organic fouling on PA layer in nanofiltration (NF) membranes in a long run, present study attempts to create a new interfacial thin film asymmetric structure using biopolymer chitosan as sustainable alternative. Herein, the effect of chitosan-silver on porous support structure and filtration performance were systematically investigated. Further, the membranes were characterized for their functionality and surface characteristics using ATR-IR, FESEM, AFM, UV-vis spectroscopy and contact angle measurements, respectively. New asymmetric membrane performances in cross flow process were evaluated in terms of pure water flux, NaCl (∼40 %), red brown/organic dye (>98 %) and tannery wastewater flux and rejection (>98 %). With a higher pure water flux (>100 L m h) compared to control (40 L m h) at 4 bar, membrane showed exceptional antifouling behaviors in comparison to commercial PA membrane. Further, surface characteristics of the membranes before and after rigorous testing were evaluated using AFM micrographs and SEM imaging.
取代商业上成功的通过界面聚合制备的薄膜复合（TFC）膜中的聚酰胺（PA）层一直是一项具有挑战性的任务。最近，由于其对高污染水的日益严重的污染倾向，PA 受到了审查。为了从长远来看减轻纳滤（NF）膜中 PA 层的生物和有机污染，本研究试图使用生物聚合物壳聚糖作为可持续替代品来创建新的界面薄膜不对称结构。在此，系统研究了壳聚糖-银对多孔支撑结构和过滤性能的影响。此外，分别使用衰减全反射红外光谱（ATR-IR）、场发射扫描电子显微镜（FESEM）、原子力显微镜（AFM）、紫外-可见光谱和接触角测量对膜的功能和表面特性进行了表征。在错流过程中，根据纯水通量、NaCl（约 40%）、红棕色/有机染料（>98%）和制革废水通量和截留率（>98%）评估了新不对称膜的性能。与对照（40 L m h）相比，在 4 巴下，膜的纯水通量（>100 L m h）更高，与商业 PA 膜相比，膜表现出出色的抗污染性能。此外，使用 AFM 显微照片和 SEM 成像评估了严格测试前后膜的表面特性。
