TY - JOUR
T1 - Influence of sulfuric-acid-bath pretreatment and soaked in sulfuric acid on surface morphology and photocatalytic activity of titania coatings
AU - Guan, Su Jun
AU - Hao, Liang
AU - Kasuga, Shota
AU - Yoshida, Hiroyuki
AU - Cheng, Yan Ling
AU - Lu, Yun
N1 - Publisher Copyright:
© 2020, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/12
Y1 - 2020/12
N2 - 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.
AB - 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.
KW - TiO coatings
KW - mixed-phase
KW - photocatalytic activity
KW - sulfuric-acid-bath pretreatment
KW - surface morphology
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U2 - 10.1007/s11431-019-1533-4
DO - 10.1007/s11431-019-1533-4
M3 - Article
AN - SCOPUS:85087057534
VL - 63
SP - 2657
EP - 2663
JO - Science China Technological Sciences
JF - Science China Technological Sciences
SN - 1674-7321
IS - 12
ER -