Influence of sulfuric-acid-bath pretreatment and soaked in sulfuric acid on surface morphology and photocatalytic activity of titania coatings  

作　　者：GUAN SuJun HAO Liang KASUGA Shota YOSHIDA Hiroyuki CHENG YanLing LU Yun 

机构地区：[1]Department of Physics,Tokyo University of Science,Tokyo 162-8601,Japan [2]College of Mechanical Engineering,Tianjin University of Science and Technology,Tianjin 300222,China [3]Department of Mechanical Engineering,Chiba University,Chiba 263-8522,Japan [4]Chiba Industrial Technology Research Institute,Chiba 263-0016,Japan [5]Beijing Key Laboratory of Biomass Waste Resource Utilization,Beijing Union University,Beijing 100023,China

出　　处：《Science China(Technological Sciences)》2020年第12期2657-2663,共7页中国科学（技术科学英文版）

摘　　要：Titania(TiO2) photocatalyst coatings have been fabricated by the low-cost approach of sulfuric-acid-bath pretreatment(SAP)followed soaked in sulfuric acid(SA) at room temperature then oxidated in air. The influence of the SAP and soaked conditions on the surface morphology and photocatalytic activity of TiO2 on Ti coatings was investigated. With different SAP conditions,the surface morphologies of the TiO2 on Ti coatings clearly show the formed porous-like structure. With higher SA concentration,the porous-like structure becomes obviously. With extending soaked time,the porous-like structure tends to disappear. Raman spectroscopy reveals that the formed TiO2 coatings are with mixed-phase of anatase and rutile. Compared with those of SA concentration and SAP time,the influence of the soaked time on the phase transformation is obvious. Notably,the photocatalytic activity of TiO2 on Ti coatings had been efficiently enhanced by extending the soaked time,compared with those of higher SA concentration and longer SAP time. The enhanced photocatalytic activity of TiO2 on Ti coatings could be related with the changed surface morphology,mixed-phase of anatase and rutile,and formed hydroxyl groups.

关 键 词：TiO2 coatings sulfuric-acid-bath pretreatment MIXED-PHASE photocatalytic activity surface morphology 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]