Coupling　photocatalytic　H2　evolution　and　phenol　degradation　have　drawn　much　attention　on　H2　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　H2　thus　was　enhanced　via　the　phenol　oxidation.　However,　H2　is　still　needed　to　be　purified　from　the　reaction　products　by　traditional　methods.　In　this　study,　we　demonstrated　the　simultaneous　separation　of　H2　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　H2　from　the　products　directly.　Three　Rh-doped　SrTiO3　(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　H2　evolution　photocatalyst　and　WO3　for　phenol　oxidation　photocatalyst,　where　Fe3+/Fe2+　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,　H2　production　rate　increased　2.7　times,　reaching　1.90　μmol　g−1　h−1,　compared　to　that　in　the　single　reactor.　Moreover,　the　H2　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　H2　production　in　the　twin-reactor　was　also　thoroughly　investigated.　The　results　showed　that　increased　phenol　initial　concentration　would　enhance　the　production　of　H2.　With　200　μmol　L−1　phenol,　the　H2　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.