Tolan Dina A, El-Sawaf Ayman K, Alhindawy Islam G, Ismael Mohamed H, Nassar Amal A, El-Nahas Ahmed M, Maize Mai, Elshehy Emad A, El-Khouly Mohamed E
Department of Chemistry, College of Science and Humanities, Prince Sattam bin Abdulaziz University Alkharj 11942 Saudi Arabia.
Department of Chemistry, Faculty of Science, Menoufia University Shibin El-Kom Egypt
RSC Adv. 2023 Aug 23;13(36):25081-25092. doi: 10.1039/d3ra04034h. eCollection 2023 Aug 21.
The doping of TiO with metals and non-metals is considered one of the most significant approaches to improve its photocatalytic efficiency. In this study, the photodegradation of methyl orange (MO) was examined in relation to the impact of Bi-doping of TiO. The doped TiO with various concentrations of metal was successfully synthesized by a one-step hydrothermal method and characterized using X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and UV-vis spectroscopy. The XRD results revealed that the anatase phase, with an average crystallite size of 16.2 nm, was the main phase of TiO. According to the anatase texture results, it was found that the doping of TiO increased the specific surface area for BiO@TiO without a change in the crystal structure or the crystal phase of TiO. Also, XPS analysis confirmed the formation of Ti and Ti as a result of doping with Bi. The activities of both pure TiO and Bi-doped TiO were tested to study their ability to decolorize MO dye in an aqueous solution. The photocatalytic degradation of MO over BiO@TiO reached 98.21%, which was much higher than the 42% achieved by pure TiO. Doping TiO with Bi increased its visible-light absorption as Bi-doping generated a new intermediate energy level below the CB edge of the TiO orbitals, causing a shift in the band gap from the UV to the visible region, thus enhancing its photocatalytic efficiency. In addition, the effects of the initial pH, initial pollutant concentration, and contact time were examined and discussed.
用金属和非金属对二氧化钛进行掺杂被认为是提高其光催化效率的最重要方法之一。在本研究中，考察了二氧化钛铋掺杂对甲基橙（MO）光降解的影响。采用一步水热法成功合成了不同金属浓度的掺杂二氧化钛，并通过X射线衍射（XRD）、傅里叶变换红外（FTIR）光谱、X射线光电子能谱（XPS）、场发射扫描电子显微镜（FESEM）和紫外可见光谱对其进行了表征。XRD结果表明，二氧化钛的主要相为锐钛矿相，平均晶粒尺寸为16.2nm。根据锐钛矿织构结果发现，二氧化钛的掺杂增加了BiO@TiO的比表面积，而二氧化钛的晶体结构和晶相没有改变。此外，XPS分析证实了由于铋掺杂而形成了Ti和Ti。测试了纯二氧化钛和铋掺杂二氧化钛的活性，以研究它们在水溶液中使MO染料脱色的能力。BiO@TiO对MO的光催化降解率达到98.21%，远高于纯二氧化钛的42%。用铋掺杂二氧化钛增加了其可见光吸收，因为铋掺杂在二氧化钛轨道的导带边缘以下产生了一个新的中间能级，导致带隙从紫外区向可见光区移动，从而提高了其光催化效率。此外，还考察并讨论了初始pH值、初始污染物浓度和接触时间的影响。
