Enhancement of catalytic performance of cobalt-doped g-C3N4 catalyst by the synergistic interaction between photocatalytic and peroxymonosulfate activation system

Photo-assisted activation of permonosulfate (PMS) is an effective technology for degradation of organic contaminants. Herein, the cobalt-doped (Co-doped) g-C 3 N 4 photocatalyst was synthesized by the methods of impregnation and calcination. The catalytic activity of Co-doped g-C 3 N 4 catalyst for degradation of RhB in the photo-assisted PMS activation system was obviously higher than that in solo light irradiation or solo PMS-based advanced oxidation processes system. The Co-CN-2 catalyst presents the highest catalytic activity for degradation of RhB in the photo-assisted PMS activation system. 93.5% of RhB was degraded in 10 min by Co-CN-2 catalyst and the kinetic constant of Co-CN-2 catalyst in photo-assisted PMS activation system is 0.267 min −1 , which is 3.71 and 7.36 times to that of Co-CN-2 in solo PMS activation and solo light irradiation system, respectively. The enhanced catalytic activity of Co-CN-2 was mainly attributed to the controllable band structure of g-C 3 N 4 by doping cobalt ions as well as excellent activity of cobalt for PMS activation, and the synergistic interaction between the photo-catalytic and PMS activation plays an important role for degradation of organic pollutants.