Black TiO₂ 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 TiO₂ 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 TiO₂. The stability and flexibility of the nanofibers allow their application in a continuous system and can be reused after several cycles.

Graphical abstract

中文翻译：

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PVDF-GO/black-TiO 2 纳米纤维的物理性能及其光催化降解亚甲基蓝和孔雀绿染料

黑色 TiO ₂和氧化石墨烯 (GO) 作为可见光驱动的染料光降解有效催化剂引起了广泛关注。本研究采用纳米黑色 TiO ₂由锐钛矿氧化钛的简单氢化制备，氧化石墨烯通过应用改进的Hummers方法制备。已经研究了漫反射光谱以找出处理过的和纳米黑色样品的光学能隙。仔细检查制备的粉末和纳米纤维膜，以确保它们形成单相和复合结构，并测量等效的微晶尺寸和颗粒分布。孔雀石绿和亚甲蓝染料的最佳降解效率分别发生在 pH 值为 8 和 10 时。在可见光下 30 分钟后，孔雀石绿 (MG) 和亚甲蓝 (MB) 的最大光催化降解效率分别为 74% 和 39%。₂ . 纳米纤维的稳定性和柔韧性允许它们在连续系统中应用，并且可以在几个循环后重复使用。

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