Nitrogen-sulfur co-doped industrial graphene as an efficient peroxymonosulfate activator: Singlet oxygen-dominated catalytic degradation of organic contaminants

•Synthesis of NS co-doped industrial graphene material (i-rGO-NS) for the first time.•i-rGO-NS has superior catalytic activity over conventional catalysts to activate PMS.•Co-doping of N and S is critical in enhancing catalytic performance.•A nonradical pathway (or 1O2) plays the dominate role in activation of PMS.•i-rGO-NS/PMS system has high potential to degrade organic contaminants in water.