Herein,　red　lead　(Pb3O4)　is　firstly　reported　to　be　able　to　degrade　organic　pollutants　efficiently　and　simultaneously　fix　CO　2　in　aqueous　solution　under　visible　light　irradiation.　CO2　bubbling　accelerates　both　the　organic　contaminant　decomposition　and　the　CO　2　fixation.　Pb3O4　was　partially　transformed　to　Pb3(CO3)2(OH)2　or　PbCO3　in　the　process.　Thermal　decomposition　of　the　solid　products　can　obtain　high　concentration　of　pure　CO2　and　PbO.　Pb3O4　can　be　regenerated　easily　by　calcinations　of　PbO　in　O2　atmosphere.　This　work　provides　a　possible　route　to　purify　organic　wastewater　and　fix　CO　2　synchronously　with　visible　light　illumination.　©　2012　The　Royal　Society　of　Chemistry.