Adsorption and photodegradation of methylene blue using a bulk Ti material with porous titania layer prepared by chemical oxidation

作者：Ting Hsueh Fan; Chen Chih Ming; Lu Fu Hsing; Suen Shing Yi^*

来源：Journal of the Taiwan Institute of Chemical Engineers, 2014, 45(2): 617-624.

DOI：10.1016/j.jtice.2013.07.002

• Porous titania layer
• Chemical oxidation
• Adsorption
• Photodegradation
• Methylene blue

In this study, a chemical oxidation method was adopted to prepare a porous titania network on Ti bulk for dye adsorption and photodegradation. The prepared titania layer was characterized by SEM, AFM, ATR-FTIR, XRD, and zeta potential. Using a longer oxidation time (90 min), a thicker titania layer (approximate to 4 mu m) with pH(pzc) (pH of the point of zero charge) of ca. 2.2 and larger fraction of anatase phase could be formed. The prepared titania layer exhibited a better adsorption capability for MB (methylene blue) at various pH values than the commercial P25 TiO2 nanoparticles (pH(pzc) = 6.0-6.8). Moreover, the effect of surface roughness on dye photodegradation was investigated. With UV irradiation, it took 6 h to completely decompose MB using the titania layer prepared from the polished surface, whereas only half time was required by that abraded via #240 sandpaper. An improved dye photodegradation efficiency was achieved by a rougher surface for providing a larger surface area.

• 出版日期2014-3