Preparation and characterization of V-Loaded titania nanotubes for adsorption/photocatalysis of basic dye and environmental hormone contaminated wastewaters

• Published in: Catalysis today Vol. 307; pp. 119 - 130
• Main Authors: Lin, Kuen-Song, Lin, Yan-Gu, Cheng, Hao-Wei, Haung, Yu-Heng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.06.2018
• Subjects: Adsorption kinetics; Basic violet 3 dye; Photocatalysis; Tetrachloroethene; Titania nanotube; Vanadium loading; Tetrachloroethene; Basic violet 3 dye; Adsorption kinetics; Vanadium loading; Titania nanotube; Photocatalysis
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2017.05.075

[Display omitted] •Titania nanotubes (TNs) with 10×150nm size were prepared by hydrothermal method.•V2O5 is the main specimen in 5% V–TNs calcined at 673K under flowing air for 4h.•V-TNs enhance the removal efficiencies of BV3/PCE up to 100 and 96%, respectively.•5% V/TNs had V atom coordinated by VO bond distance of 1.71Å and CN of 5.35.•Adsorption mechanism of BV3/PCE onto TNs was examined using DKR equation. Titania nanotubes (TNs) with high specific surface area have been widely studied due to its excellent catalytic activities, long-term stability, nontoxicity, and low cost. Basic violet 3 (BV3) dye and perchloroethylene (PCE) environmental hormone are recognized as difficult-to-treat pollutants and are discharged by a wide variety of sources. Therefore, the main objectives of the present work were to prepare V–loaded TN photocatalysts by an impregnation method and to characterize the adsorptive/photocatalytic properties, fine structures, adsorption/photodegradation mechanisms or removal efficiencies of dye and environmental hormone pollutants in wastewaters using V–TNs. Experimentally, FE–SEM and HR–TEM microphotos showed that the length and diameter of TNs were 100–150 and 10–30nm, respectively. XRD weak vanadia patterns observed in V–TNs indicating the V2O5 nanoparticles are possibly well dispersed on the surface of TNs. The BET surface area and pore volume of TNs (V–TNs) are 312 (291)m2g-1 and 1.054 (0.879) cm3g-1 with N2 type IV hysteresis isotherms, respectively. The EXAFS data showed that the 5% V–TNs had Ti (V) atoms coordinated by primarily TiO (VO) with bond distances of 1.95Å (1.71Å) and coordination numbers of 2.29 (5.35). The removal efficiencies of BV3/PCE onto 5% V–TNs were 100 and 96%, respectively and loaded V2O5 is the main specimen that can promote the photocatalytic efficiencies significantly under visible light irradiation. Finally, adsorption and photocatalytic mechanisms of BV3/PCE onto V–TNs were examined using DKR/pseudo-second-order equations and Langmuir-Hinshelwood model.