期刊
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
卷 21, 期 10, 页码 1793-1806出版社
SPRINGERNATURE
DOI: 10.1007/s43630-022-00257-5
关键词
TiO2 nanotubes; Anodic oxidation; Hexavalent chromium; Heterogeneous photocatalysis; Mechanical properties; Erosion test
资金
- CONICET
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT) from Argentina [PICT-2017-2133, PICT-2017-2494]
The photocatalytic and mechanical properties of TiO2 nanotubular coatings obtained through anodic oxidation on commercial titanium were studied. The size of the nanotubes can be controlled by adjusting the anodization voltage and NH4F concentration. These nanotube coatings exhibited excellent photocatalytic activity, mechanical properties, and could be used for water treatment.
The photocatalytic and mechanical performance of TiO2 nanotubular coatings obtained by anodic oxidation of commercial titanium, using an NH4F and 3.5% v/v water in ethylene glycol solution as electrolyte was investigated. After the anodization, the coatings were thermally treated at 450 degrees C for 2 h. The effects of the anodizing voltage (40-80 V) and NH4F concentration (0.06, 0.15, 0.27 M) on the formation of the nanotube arrays were evaluated. Nanotube diameters (57 to 114 nm), wall thicknesses (4 to 13 nm), and lengths (5 to 17 mu m) increased with the anodizing voltage and the NH4F concentration. The photocatalysts were characterized by scanning electron microscopy, glancing incidence X-ray diffraction, and UV-Vis diffuse reflectance spectroscopy. The mechanical properties of the photocatalysts were determined: adhesion using the tape test (ASTM D3359) and erosion resistance through a 3 h accelerated test. The photocatalytic activity of the nanotubes under UV irradiation was evaluated using hexavalent chromium (Cr(VI)) in the presence of ethylenediaminetetraacetic acid (EDTA), using a 1.25 EDTA/Cr(VI) molar ratio solution at pH 2. A complete Cr(VI) transformation after 3 h of irradiation was obtained for all samples, with a better performance than that of an immobilized P25 sample. The photocatalyst obtained with 0.27 M NH4F at 40 V presented a good behavior in adherence and erosion resistance, together with a very good photocatalytic activity. This novel analysis, combining photocatalytic and mechanical tests, proved that the new TiO2 nanotubular coatings could be successfully used as immobilized photocatalysts in photoreactors for water treatment. [GRAPHICS] .
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据