Abstract An exfoliated hydrotalcite/graphene oxide (EHT/GO) hybrid nanosheet was synthesized via flocculation deposition and could be uniformly dispersed in PEI solution to be used as aqueous phase for interfacial polymerization. The process of EHT/GO flocculation and deflocculation was analyzed to gain a better understanding of its emerging mechanism. The thin-film selective layers of the hybrid membranes were formed via interfacial polymerization on the surface of PES substrate. Typically, trimesoyl chloride (TMC, 1% wt) and branched polyethyleneimine (PEI, 1.5% wt) were used as the organic phase monomer and the aqueous phase monomer. Afterwards, SEM and atomic force microscopy (AFM) were employed to characterize the morphology of the hybrid membranes and FTIR, TGA, X-ray photoelectron spectroscopy (XPS) were utilized to detect surface chemical composition of the resultant membranes. The result showed that incorporation of EHT/GO into a polyamide (PA) membrane could effectively enhance its water flux, reaching 26 L/(m 2 h) at 0.8 MPa. The salts rejection of all membranes followed the sequence: MgCl 2 > NaCl > MgSO 4 > Na 2 SO 4 , confirming that the membranes were positively charged. The rejection of EHT/GO membrane for MgCl 2 could reach 97.0%, which owned superior water softening performance.

中文翻译：

---

用于海水淡化的水滑石/氧化石墨烯杂化纳米片功能化纳滤膜

摘要 通过絮凝沉积合成了剥离水滑石/氧化石墨烯（EHT/GO）杂化纳米片，该纳米片可均匀分散在PEI溶液中，用作界面聚合的水相。分析了 EHT/GO 絮凝和反絮凝的过程，以更好地了解其出现的机制。杂化膜的薄膜选择性层是通过在 PES 基材表面上的界面聚合形成的。通常，均苯三甲酰氯 (TMC, 1% wt) 和支化聚乙烯亚胺 (PEI, 1.5% wt) 用作有机相单体和水相单体。然后，使用 SEM 和原子力显微镜 (AFM) 来表征混合膜的形貌以及 FTIR、TGA、X射线光电子能谱（XPS）用于检测所得膜的表面化学成分。结果表明，将 EHT/GO 掺入聚酰胺 (PA) 膜可以有效提高其水通量，在 0.8 MPa 时达到 26 L/(m 2 h)。所有膜的盐截留率遵循以下顺序：MgCl 2 > NaCl > MgSO 4 > Na 2 SO 4 ，证实膜带正电荷。EHT/GO膜对MgCl 2 的截留率可达97.0%，具有优异的软化水性能。确认膜带正电。EHT/GO膜对MgCl 2 的截留率可达97.0%，具有优异的软化水性能。确认膜带正电。EHT/GO膜对MgCl 2 的截留率可达97.0%，具有优异的软化水性能。