Major Contributions

1. The research systematically demonstrated that higher pH results in thicker GO layers and enlarged d-spacing due to deprotonation of carboxyl groups, providing fundamental understanding of pH-controlled membrane structure formation.

2. The study revealed different crosslinking mechanisms between polyethyleneimine (PEI) and GO sheets under different pH conditions - C-N bond formation dominates at the basal plane in acidic environments, while N-C=O (amide) bond formation prevails at the edges under alkaline conditions.

3. The research achieved superior heavy metal ion separation performance, with the GP membrane fabricated at pH 11 showing over 95% Pb2+ rejection, demonstrating practical application potential in water treatment.


主要貢獻

1. 此研究系統性證實較高pH值會因羧基去質子化而導致GO層變厚且層間距增大，為pH控制薄膜結構形成提供了基礎理解。

2. 研究揭示了聚乙烯亞胺(PEI)與GO片層在不同pH條件下的不同交聯機制 - 在酸性環境下主要在基面形成C-N鍵，而在鹼性條件下則在邊緣優先形成N-C=O（醯胺）鍵。

3. 研究實現了優異的重金屬離子分離性能，在pH 11製備的GP薄膜展現出超過95%的鉛離子阻隔率，展示了在水處理方面的實際應用潛力。