One-step solvothermal synthesis of wood flour carbon fiber/BiOBr composites for photocatalytic activation of peroxymonosulfate towards sulfadiazine degradation: Mechanisms comparison between photo, chemical and photo-chemical oxidation processes

•Carbon nanofiber/BiOBr composite was prepared via one-step in-situ solvothermal process.•The composite exhibits prominent photo-assisted PMS activation capability.•Mechanisms in photo, chemical and photo-chemical oxidation processes were elucidated.•Multiple active species were generated in the photo-chemical oxidation system.•The composite had promising stability and adaptability.