In　recent　decades,　photocatalytic　decomposition　of　water　to　hydrogen　has　attracted　much　interest.　In　order　to　explore　the　feasibility　of　wastewater　containing　benzene　as　the　sacrificial　agents,　the　photocatalytic　activity　of　Pd/TiO2　for　water-splitting　to　hydrogen　with　benzoic　acid　solution　was　investigated.　A　Perfectlight　Labsolar-III　AG　reaction　system　equipped　with　a　double　seven-valve　system　and　a　300　W　Xenon　lamp　as　the　light　source　was　used　for　the　photocatalytic　activity　experiment.　The　used　model　photocatalyst　Pd/TiO2　(w(Pd)=0.5　%)　was　prepared　by　photo-deposition.　The　structure　and　properties　of　a　series　of　Pd/TiO2　samples　were　characterized　by　X-ray　powder　diffraction　(XRD),　Brunauer-Emmett-Teller　(BET),　transmission　electron　microscopy　(TEM),　X-ray　photoelectron　spectroscopy　(XPS)　and　UV-vis　diffuse　reflection　spectrum　(DRS).　The　results　indicated　that　introduction　of　Pd　did　not　change　the　TiO2　anatase　structure,　but　led　to　higher　specific　surface　area　and　smaller　pore　size　than　TiO2.　Moreover,　the　photoabsorption　edge　of　Pd/TiO2　was　unchanged　after　adding　Pd,　but　the　absorption　range　increased　slightly.　The　introduced　Pd　was　primarily　presented　as　Pd0　and　Pd2+　and　highly　dispersed　as　nanoparticles　on　the　surface　of　TiO2.　When　benzoic　acid,　phthalic　acid,　and　trimesic　acid　solution　were　used　as　the　sacrificial　agents,　the　rates　of　hydrogen　production　on　the　photocatalyst　were　4.264,　6.429　and　5.400　mmol/(g·h),　respectively.　The　rates　were　5.8,　8.8　and　7.4　times　higher　than　those　without　the　sacrificial　agents　0.733　mmol/(g·h),　respectively.　Acetic　acid　and　trifluoroacetic　acid　as　the　sacrificial　agents　were　also　studied　for　insight　into　the　effect　of　structure　of　the　sacrificial　agents.　The　rate　of　hydrogen　production　was　closely　related　to　the　difficulty　of　decarboxylation　reaction　and　the　amount　and　spatial　arrangement　of　the　carboxyl　groups　present　on　the　sacrificial　agents　(the　easier　the　photo-Kolbe　decarboxylation　reaction　reacted,　more　amount　of　carbonyl　and　smaller　spatial　arrangement　of　the　sacrificial　agents,　which　will　led　to　the　higher　rate　of　hydrogen　production).　The　results　provide　important　guidance　for　the　selection　of　sacrificial　agents　in　photocatalytic　water-splitting　reactions.　There　is　still　a　long　way　to　go　in　exploring　efficient　and　stable　sacrificial　agents　for　further　exploration　of　the　photocatalytic　water-splitting　into　hydrogen.　©　2016,　Editorial　Board,　Research　of　Environmental　Sciences.　All　right　reserved.