▎ 摘　　要

Recent studies have highlighted the great potential of graphene oxide (GO) as the basis of advanced separation membranes for water-related environmental applications. However, pristine GO membranes usually suffer from low water permeability and inadequate stability that limit their further progress and application in practice. Here, a novel approach involving intra-defect construction, combined with cation cross-linking, was used to prepare highly permeable and stable GO membranes for water purification. The preparation was based on Fenton system to achieve enhanced regulation of the membrane structure. The in-situ generated Fe(III) and reaction products (hydroxyl radical and Fe-based nanoparticles) enabled the formation of tightly cross-linked GO nano -sheets and favorable pinholes and void defects within the membrane, which stabilized the membrane structure and enhanced its permeability. The resultant membrane achieved an ultrahigh water flux (similar to 45 L m-2 h-1 bar- 1), together with a favorable rejection of Coomassie brilliant blue dye (>91%), natural organic matter (humic acid and bovine serum albumin, >95%) and superior dye/salt selectivity. Moreover, the membrane exhibited a long-term operating stability and pressure-resistance performance. This study offers a facile and scalable method for the design of high performance GO and other two-dimensional (2D) membranes for water purification.