y　TiO2-supported　clinoptilolites　(TiO2/clinoptilolites)　were　successfully　synthesized　with　controlled　crystal　phase　and　particle　size　via　hydrothermal　method　to　enhance　photocatalytic　performance　of　TiO2.　The　effects　of　various　parameters　including　temperature,　acidity　and　concentration　of　Ti-containing　solutions　on　the　particle　size,　crystal　phase　and　agglomeration　of　TiO2　supported　on　clinoptilolite　were　investigated　thoroughly　by　characterizations　of　X-ray　diffraction　(XRD),　Fourier　transform　infrared　(FT-IR)　spectroscopy,　scanning　electron　microscope　(SEM),　transmission　electron　microscope　(TEM),　BET　isotherm,　UV-visible　(UV-vis)　spectrophotometer　and　Malvern　zetasizer.　The　results　demonstrate　that　increasing　temperature　and　strengthen　acidity　are　beneficial　to　enhance　the　crystallinity　and　particle　size　of　supported　TiO2.　Increase　in　acidity　also　leads　to　more　uniform　distribution　of　TiO2　on　the　surface　of　clinoptilolite.　The　TiO2　nanocrystals　deposited　on　the　surface　of　clinoptilolite,　exhibit　rutile　or　anatase　phase,　strongly　depending　on　the　preparation　procedure.　The　resultant　TiO2/clinoptilolites　could　be　used　as　photo-catalysts　for　the　degradation　of　crystal　violet　(CV)　dye　in　aqueous　solution,　showing　a　higher　photocatalytic　activity　with　89%　degradation　within　100　min.　The　effect　of　operational　parameters,　such　as　pH　values　of　reaction　media,　dose　of　used　catalyst,　and　concentration　of　CV　dye　on　the　CV　degradation　performance　were　investigated,　in　which　the　kinetics　of　CV　dye　degradation　was　found　to　follow　the　pseudo-first　order　kinetic　model.　(C)　2019　Production　and　hosting　by　Elsevier　B.V.　on　behalf　of　King　Saud　University.