Plasma treated g-CN (PT-g-CN) was obtained by a simple and rapid DBD plasma modification process on the pristine g-CN. Compared with the pristine g-CN, the grain size of the PT-g-CN decreased from 99.2 nm to 57.2 nm, the specific surface area and the pore volume increased by 15% and 33.8%, respectively. Oxygen-containing groups such as -NO and -COOH were observed to form on the surface of PT-g-CN so the hydrophilic property of PT-g-CN was much higher than that of pristine g-CN. More importantly, the photocatalytic HO production activity of PT-g-CN was significantly improved on account of the treatment in plasma atmosphere for only 5 min, the HO yield of which was about 13 times that of the pristine g-CN. Our finding is not only of great significance for effectively promoting the production of HO under mild conditions, but also proposes an innovative DBD plasma method to modify the g-CN photocatalyst, which effectively promotes the improvement of photocatalytic activity and provides valuable insights for catalyst modification studies.
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