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.
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机译：TiO2具有高的稳定性，无毒性，高的催化活性和高的电导率，因此被人们最广泛地研究。许多研究表明，TiO2会产生被UV照射的电子-空穴对，并且比被照射前的能量包围更多的能量。在这项研究中，制备了钛纳米管（TNT）光催化剂以增加表面积和吸附能力。 Fe TNT也由炉渣铁制备，因为许多炉渣铁会引起废物处理问题。在这项研究中，还评估了不同的铁负载量，因为掺有金属的TNT可用于提高降解效率。此外，测试了10、20、100、200和400μppm的五种染料浓度，以及0、0.77、1.13、2.24和4.50％的五种Fe掺杂含量。还评估了不同种类的反应时间和染料种类。在该结果中，尽管浓度降低或剂量增加，但是直接黑22最难降解。在365 nm的紫外线下，0.04 gL-1TNT对10 ppm Direct Black 22的降解效率低于40％。
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