Abstract
TiO2has been studied most commonly because it has high stability, nontoxicity, high catalytic activity, and high conductivity. Many studies have shown that TiO2would generate electron-hole pairs illuminated with UV and surround more energy than that before being illuminated. In this study, the titanium nanotube (TNT) photocatalysts were prepared to increase the surface area and adsorption capacity. The Fe TNT was also prepared from a slag iron since many slag irons cause waste treatment problems. In this study, a different Fe loading was also assessed since TNT doped with metals can be used to improve the degradation efficiency. Furthermore, five kinds of dye concentration, including 10, 20, 100, 200, and 400 ppm, and five kinds of Fe-doped content, including 0, 0.77, 1.13, 2.24, and 4.50%, were tested. Different kinds of reaction time and dye species were also assessed. In this result, Direct Black 22 was the most difficult to be degraded, although the concentration was decreased or the dose amount was increased. The degradation efficiency of 10 ppm Direct Black 22 was below 40% with 0.04 gL−1TNT under 365 nm UV irradiation.
Highlights
About 15% of the total world production of dyes is lost during textile dyeing when dyes are released as textile effluents [1]
The results showed that less energy was needed for reacting with pollutants with the 1.13% Fe titanium nanotube (TNT)
The differences between photocatalytic activity of different Fedoped TiO2 and pure TiO2 were illustrated in Figure 7 and described later
Summary
About 15% of the total world production of dyes is lost during textile dyeing when dyes are released as textile effluents [1]. Dyes are widely used in the textile industry and cause polluted water. The disposal of this colored wastewater into the environment leads to many ecological problems as well as diminished natural aesthetics [2]. In suitable irradiation sunlight, using titanium dioxide can decrease costs significantly [6]. Photocatalysts have several obvious advantages in technique, including cleaner air, an extraction stream, and carbon adsorption. In these processes, oxygens occur OH∙ hit, and a rate constant is higher than the oxidation of a normal state ten billion times. Ultraviolet irradiation can be obtained from sunlight or a simulated light source
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