The　attainment　of　rapid　charge　mobility　and　effective　N-2　activation　is　of　critical　importance　for　photocatalytic　nitrogen　fixation　but　it　has　always　been　a　challenge.　Such　challenge　may　be　met　by　the　construction　of　a　Type　II　MoS2　nanoparticles/　MIL-100(Fe)　heterojunction　photocatalyst.　The　new　material　possesses　charge　migration　channels　that　facilitate　the　separation　of　photogenerated　carriers.　This　charge　redistribution　during　photocatalysis　is　confirmed　by　experimental　results　showing　a　decrease　of　charge　density　on　the　Fe　species　and　an　increase　of　that　on　Mo.　Moreover,　DFT　calculations　show　that　the　adsorption　of　N-2　and　H2O　is　more　likely　to　occur　on　Fe　sites　and　Mo　sites,　respectively.　These　findings　clearly　suggest　a　drastically　improved　spatial　isolation　of　reduction　and　oxidation　sites　on　the　photocatalyst　as　compared　to　pristine　MIL-100(Fe).　The　optimized　MoS2/MIL-100(Fe)　exhibits　a　NH4+　yield　rate　of　1.29　mu　molh(-1)　as　excellent　utilization　of　photoinduced　electron-hole　pairs　and　effective　adsorption　and　activation　of　N-2　become　possible.　This　work　offers　an　insight　on　the　synergy　of　heterojunction　engineering　with　coordinated　activation　for　photocatalytic　ammonia　synthesis.