Schematic illustration.

Major Contributions

1. Development of Eco-friendly and Biodegradable GO-Lysine Nanocomposite Membranes
A novel lamellar-structured graphene oxide (GO) nanocomposite membrane was fabricated using lysine as an environmentally friendly and biodegradable intercalator and crosslinker. This design not only expands the interlayer spacing of GO but also enhances the membrane’s mechanical strength and chemical stability, addressing the swelling and selectivity-permeability trade-offs that have limited the commercial application of GO-based membranes in pervaporation desalination.

2. Enhanced Desalination Performance and Stability
The optimal GO-Lysine nanocomposite membrane (GO-L0.1) achieved a NaCl rejection rate exceeding 99.99% and a water flux of 66.3 kg m⁻² h⁻¹ at 70°C using a 3.5% NaCl solution. The membrane maintained consistent performance over extended operation, demonstrating superior long-term stability and reusability compared to pristine GO membranes and other reported GO-based membranes.

3. Comprehensive Physicochemical Characterization and Mechanistic Insights
Detailed physicochemical analysis—including SEM, AFM, XRD, FTIR, XPS, TGA, zeta potential, and water contact angle measurements—demonstrated that lysine intercalation increases the interlayer spacing and hydrophilicity of the membrane while reducing swelling. The study provided mechanistic insights into how lysine’s functional groups chemically bond with GO, resulting in improved separation efficiency and durability under various operational conditions.

主要貢獻

1. 開發環保且可生物降解之GO-離胺酸複合膜
本研究以離胺酸作為環保且可生物降解的插層與交聯劑，製備出新型層狀結構石墨烯氧化物（GO）複合膜。此設計有效擴大GO層間距，同時提升膜的機械強度與化學穩定性，解決了GO基膜於蒸發滲透脫鹽應用中易膨潤及選擇性與通量難以兼顧的問題。

2. 膜脫鹽性能與穩定性大幅提升
最佳化的GO-離胺酸複合膜（GO-L0.1）在3.5% NaCl溶液、70°C條件下，展現超過99.99%的NaCl脫除率與66.3 kg m⁻² h⁻¹的高水通量，並於長時間運作下維持穩定表現，顯著優於傳統GO膜及文獻中其他GO基改質膜。

3. 全面性物化分析與作用機制闡釋
透過SEM、AFM、XRD、FTIR、XPS、TGA、zeta電位及水接觸角等多項物理化學分析，證實離胺酸插層可增加層間距與親水性並抑制膨潤。研究亦闡明離胺酸官能基與GO之間的化學鍵結機制，進一步提升分離效率與膜在多種操作條件下的耐久性。