Coupling　photocatalytic　H　2　evolution　and　phenol　degradation　have　drawn　much　attention　on　H　2　as　clean　energy　and　phenol　as　an　organic　pollutant　to　the　environment.　Such　dual-function　reaction　can　utilize　the　chemical　potential　of　phenol　oxidation　to　make　up　the　chemical　potential　required　for　hydrogen　evolution　from　water　splitting.　The　production　of　H　2　thus　was　enhanced　via　the　phenol　oxidation.　However,　H　2　is　still　needed　to　be　purified　from　the　reaction　products　by　traditional　methods.　In　this　study,　we　demonstrated　the　simultaneous　separation　of　H　2　using　a　photo　twin-reactor　under　artificial　sunlight,　in　which　the　photocatalytic　efficiency　was　substantially　increased　due　to　the　inhibition　of　backward　reaction　by　separating　H　2　from　the　products　directly.　Three　Rh-doped　SrTiO　3　(STO)　photocatalysts　calcined　at　900,　1100,　1200　°C　(named　as　STO:Rh900,　STO:Rh1100,　and　STO:Rh1200,　respectively)　were　prepared　by　solid-state　fusion　reaction,　then　photo-deposition　method　was　applied　to　synthesize　Pt　loading　STO:Rh.　All　photocatalysts　were　fully　characterized　by　XRD,　XPS,　UV–vis,　SEM,　TEM,　and　DLS.　A　single　reactor　and　a　twin-reactor　(Z-scheme　system)　were　systematically　designed　by　using　Pt/STO:Rh　for　H　2　evolution　photocatalyst　and　WO　3　for　phenol　oxidation　photocatalyst,　where　Fe　3+　/Fe　2+　pairs　were　served　as　electron　transfer　mediators　to　conduct　the　dual-function　reaction.　In　the　single　reactor,　the　stoichiometric　of　the　dual-function　reaction　was　proposed　and　with　high　consistency　to　the　experimental　data.　By　using　the　twin-reactor,　H　2　production　rate　increased　2.7　times,　reaching　1.90　μmol　g　−1　h　−1　,　compared　to　that　in　the　single　reactor.　Moreover,　the　H　2　concentration　of　the　gas-phase　products　increased　from　70%　(in　the　single　reactor)　to　94%　owing　to　the　separation　function　of　the　twin-reactor,　which　would　significantly　reduce　the　cost　for　further　purification.　The　effect　of　phenol　concentration　on　H　2　production　in　the　twin-reactor　was　also　thoroughly　investigated.　The　results　showed　that　increased　phenol　initial　concentration　would　enhance　the　production　of　H　2　.　With　200　μmol　L　−1　phenol,　the　H　2　yield　(11.37　μmol　g　−1　in　6-h　reaction)　was　increased　by　20%　compared　to　that　of　pure　water　splitting.　©　2018　Elsevier　B.V.