Herein,　a　g-C3N4/GO　aerogel　hybrid　with　macroscopic　3D　architecture　is　fabricated　and　applied　in　visible　light-induced　water　mediation.　The　composite　photocatalyst　with　compressibility　and　recyclability　is　extraordinarily　suitable　for　practical　application.　The　morphologies　and　properties　are　carefully　characterized,　suggesting　g-C3N4　is　well　decorated　on　the　surface　of　GO　by　pi-pi　stacking　and　the　GO　sheets　are　weltinterlaced.　A　moderate　amount　of　g-C3N4　in　the　hybrid　is　beneficial　to　photocatalytic　activity　for　dyes　and　bromates.　When　the　mass　ratio　of　g-C3N4　and　GO　is　3:5,　the　%　degradation　of　MO　and　MB　(20　mg　L-1)　can　reach　similar　to　90%　in　40　min　visible-light　illumination,　and%conversion　of　bromate　(250　mu　z　L-1)　can　be　obtained　almost　80%　in　60　min　illumination.　Underlying　premise　of　maintaining　intact　macro　appearance,　the　photocatalytic　performance　of　the　hybrid　scarcely　any　lowers　after　5　successive　runs　on　degradation　of　MO,　and　the　mass　loss　is　below　4%.　The　composite　mainly　interacts　with　the　contaminants　by　pi-pi　adsorption,　implying　it　can　be　an　important　broad-spectrum　photocatalyst　since　most　of　the　contaminants　in　the　environments　contain　pi-bond　structure.　Through　scavenger　experiments　and　ESR　determination,　peroxide　radical　anions　are　proven　as　the　predominant　species　during　the　photodegradation　processes.　(C)　2017　Elsevier　B.V.　All　rights　reserved.