Physics Department, Faculty of Science, Cairo University, Giza, Egypt.
Faculty of Nanotechnology for Postgraduate Studies, Cairo University, El-Sheikh Zayed, 12588, Egypt.
Environ Sci Pollut Res Int. 2021 Jun;28(24):30613-30625. doi: 10.1007/s11356-021-12618-1. Epub 2021 Feb 15.
Black TiO and graphene oxide (GO) have attracted intensive attention as an effective catalyst on visible light driven for photodegrading of dyes. In this study, nano-black TiO was prepared by a simple hydrogenation of the anatase titanium oxide, and the graphene oxide was prepared by applying the modified Hummers method. The diffuse reflectance spectroscopy has been investigated to find out the optical energy gaps of the treated and nano-black samples. The prepared powders and nanofiber membranes are carefully examined to ensure their single phase and compound structure formation as well as to measure the equivalent crystallite size and particle distributions. The optimum degradation efficiency of malachite green and methylene blue dyes occurred at pH values of 8 and 10, respectively. The maximum photocatalytic degradation efficiencies of malachite green (MG) and methylene blue (MB) were found to be 74 and 39%, respectively, under visible light after 30 min. The degradation efficiency of MG is peaked at pH 8 and 20 mg of the nano-black TiO. The stability and flexibility of the nanofibers allow their application in a continuous system and can be reused after several cycles.
黑 TiO 和氧化石墨烯 (GO) 作为可见光驱动的染料光降解的有效催化剂引起了广泛关注。本研究通过锐钛矿 TiO2 的简单氢化制备了纳米黑 TiO，通过改进的 Hummers 法制备了氧化石墨烯。通过漫反射光谱研究了处理前后纳米黑样品的光学能隙。仔细检查了制备的粉末和纳米纤维膜，以确保它们具有单相和化合物结构形成，并测量等效晶粒尺寸和颗粒分布。孔雀石绿和亚甲基蓝染料的最佳降解效率分别出现在 pH 值为 8 和 10 时。在可见光下 30 分钟后，发现孔雀石绿 (MG) 和亚甲基蓝 (MB) 的最大光催化降解效率分别为 74%和 39%。在 pH 8 和纳米黑 TiO 20mg 的条件下，MG 的降解效率达到峰值。纳米纤维的稳定性和柔韧性允许它们在连续系统中应用，并可以在几个循环后重复使用。
