Photocatalytic Degradation of Methyl Orange Using a TiO₂/Ti Mesh Electrode with 3D Nanotube Arrays

Abstract

To further improve the photocatalytic techniques for water purification and wastewater treatment, we successfully prepared a new type of TiO(2)/Ti mesh photoelectrode, by anodization in ethylene glycol solution. The three-dimensional arrays of nanotubes formed on Ti mesh show a significant improvement in photocatalytic activity, compared to the nanotube arrays formed on foil. This can be demonstrated by about 22 and 38% enhancement in the degradation efficiency per mass and per area, respectively, when TiO(2)/Ti mesh electrode was used to photocatalyze methyl orange (MO). Furthermore, the effects of different parameters on MO photodegradation were investigated, such as different photoelectrode calcination temperature, the initial pH value of MO solution, and the present of hydrogen peroxide. The superior photocatalytic activity could be achieved by the TiO(2)/Ti mesh photoelectrode calcinated at 550 °C, due to the appearance of mixed crystal phases of anatase and rutile. In strong acidic or caustic conditions, such as pH 1 or 13, a high degradation efficiency can be both obtained. The presence of H(2)O(2) in photocatalytic reactions can promote photocatalytic degradation efficiencies. Moreover, the experimental results demonstrated the excellent stability and reliability of the TiO(2)/Ti mesh electrode.

Tuning three-dimensional TiO2 nanotube electrode to achieve high utilization of Ti substrate for lithium storage

“…3 area (18.1 mg and 11.56 mg, respectively). The Ti conversion rate is 22 wt%, much higher than that previously reported (2 wt%) [16]. Therefore, the TiO 2 /Ti-600min mesh electrode is the most promising electrode, as it has high surface area, good mechanical behavior, and a high Ti conversion rate.…”

“…1 shows the XRD patterns of the 3D TiO 2 nanotube arrays on Ti mesh prepared by anodization in organic electrolyte over periods ranging from 60 min to 720 min, with the samples designated as TiO 2 /Ti-t mesh (t = 0, 60, 180, 420, 600, 720 min; the different anodization time intervals were used to obtain more comprehensive results and are also mentioned in our previous report) [24]. After annealing at 500 ºC, the TiO 2 nanotubes on Ti This can be attributed to van der Waals attraction and capillary forces during drying [16][17][18]. …”

“…Liao et al reported that only around 2 wt% of the Ti was converted into TiO 2 nanotubes [16]. TiO 2 nanotube array electrode grown on Ti mesh is a good choice to avoid these disadvantages.…”

Immobilization of Nano-sized TiO2 on Glass Plate for the Removal of Methyl Orange and Methylene Blue

“…Therefore, the TiO 2 surface becomes positively charged with the species TiOH 2 + at pH < pHpzc, negatively charged with the species TiO − at pH > pHpzc and neutral with the species TiOH at pH = pHpzc [8]. Furthermore, protonation and deprotonation condition of the photocatalysts surface by taking TiO 2 as a model, can be shown as follows [9,10]:…”

High efficiency reductive degradation of a wide range of azo dyes by SiO 2 -Co core-shell nanoparticles

“…Chemical treatment for dye degradation, on the other hand, is considered efficient and fast [22][23][24][25][26][27][28][29][30][31][32]. Among different chemical treatments, use of zero-valent metals such as iron [33][34][35][36], ironnickel alloy [37] and cobalt [2], respectively, as reductive catalysts, are showing both the effectiveness and eco-friendliness needed for efficient dye degradation.…”