Pesticides　and　its　degradation　products,being　well-known　residues　in　soil,have　recently　been　detected　in　many　water　bodies　as　pollutants　of　emerging　concerns,and　thus　there　is　a　contemporary　demand　to　develop　viable　and　cost-effective　techniques　for　the　removal　of　related　organic　pollutants　in　aqueous　phases.Herein,a　visible-light-responsive　Fenton　system　was　constructed　with　iron-doped　bismuth　oxybromides(Fe-BiOBr)as　the　catalysts.Taking　the　advantage　of　sustainable　Fe(Ⅲ)/Fe(Ⅱ)conversion　and　optimized　H2O2　utilization,the　optimal　Fe-BiOBr-2　catalyst　showed　an　excellent　atrazine　removal　efficiency　of　97.61％in　120　min,which　is　superior　than　the　traditional　homogeneous　Fenton　and　the　majority　of　heterogeneous　processes　documented　in　the　literature.In　this　photo-Fenton　system,hy-droxyl(·OH)and　superoxide(·O2-)radicals　were　dominant　active　species　contributed　to　the　oxidative　degradation　of　atrazine.Due　to　the　production　of　various　active　radicals,five　degra-dation　pathways　were　proposed　based　on　the　identification　of　intermediates　and　degrada-tion　products.Overall,this　work　not　only　demonstrates　a　fundamental　insight　into　creating　highly　efficient　and　atom　economic　photo-Fenton　systems,but　also　provides　a　complemen-tary　strategy　for　the　treatment　of　organic　pollutants　in　water.