Pervaporation (PV) is a low-energy membrane separation technology widely studied for desalination, water treatment and solvent recovery where heat is applied to vaporize the feed solution and a vacuum is applied at the permeate side to drive the separation of miscible mixtures. The heart of this technology – polyvinyl alcohol (PVA) that is commonly used as the separation layer of polymer membranes is often fabricated over long cross-linking durations, high temperatures or toxic cross-linkers to prevent it from being dissolved in water. Here we overcome these intrinsic material limitations with a photo-crosslinkable polymer, poly(vinyl alcohol)-stilbazol quaternized (PVA-SBQ), commonly deployed in the printing industry, as the dense selective layer of a thin-film composite PV membrane. The separation performances of the resultant PVA-SBQ/nanofiber thin-film composite membranes were optimized as a function of photo-crosslinking conditions where ultra high water fluxes of 122.6 ± 10.8 kg·m⁻²·h⁻¹ were achieved while desalinating 3.5 wt% NaCl from water at 75 °C and a permeate pressure of 100 Pa. This high PV desalination performance was also maintained during brine (containing 10 and 20 wt% of NaCl) treatment.

全蒸发（PV）是一种低能量的膜分离技术，已广泛用于脱盐，水处理和溶剂回收，其中通过加热使进料溶液汽化，并在渗透侧施加真空以驱动可混溶混合物的分离。该技术的核心–聚乙烯醇（PVA）通常用作聚合物膜的分离层，通常是在较长的交联时间，高温或有毒的交联剂下制造的，以防止其溶于水。在这里，我们通过光可交联的聚合物聚乙烯醇-季戊唑季铵化（PVA-SBQ）克服了这些固有的材料局限性，通常在印刷行业中将其用作薄膜复合PV膜的致密选择层。当在75°C和100 Pa的渗透压下从水中脱盐3.5 wt％的NaCl时，获得了^-2 ·h ^-1。在盐水（包含10和20 wt％的NaCl）处理期间，也保持了这种高PV脱盐性能。