Microwave-Synthesis of g-C3N4 Nanoribbons Assembled Seaweed-Like Architecture with Enhanced Photocatalytic Property

•A novel CN nanoribbon (CNNR) assembled seaweed-like architecture has been prepared by a facile, fast (<30 min.) and green microwave synthesis.•The as-prepared seaweed-like architecture is stable and exhibits a significantly enhanced photocatalytic property for Rhodamine B (RhB) degradation.•The significantly enhanced photocatalytic property of CNNR is mainly attributed to the synergistic effects of superior structure, O doping, and proper N defects.•The result has shed a light on realizing the practical application of CN and CN based photocatalysts.