Walter Adam D, Benamor Hiba, Ferrer Lucas M, Reji Treesa, Curran Tracey, Schwenk Gregory R, Hadji Mohamed, Creighton Megan A, Barsoum Michel W
Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, USA.
Laboratoire d'Etudes et Recherche en Technologie Industrielle, Université of Saad Dahlab Blida 1, Blida, Algeria.
iScience. 2024 Aug 3;27(9):110647. doi: 10.1016/j.isci.2024.110647. eCollection 2024 Sep 20.
Truly one-dimensional titanium oxide nanofilaments with a lepidocrocite structure (1DLs) were explored in the adsorption and photocatalytic degradation of aqueous malachite green (MG), a toxic polluting dye. Decolorization is monitored by ultraviolet-visible spectroscopy, and mineralization is confirmed by total organic carbon analysis. The 1DL/MG flocs are characterized by scanning electron microscopy and X-ray diffraction. 1DLs, a colloidal nanomaterial, exhibit flocculating behavior while demonstrating high affinity for MG, with a maximum uptake of >680 mg/g rapidly via ion exchange. Additionally, 1DLs decolorize MG under visible light , unlike most available titania products, via a self-sensitization effect. MG is decolorized by 1DLs by >70% in 30 min under 1 sun exposure of visible light. Counterintuitively, dye adsorption increases as the normalized concentration by mass of 1DL decreases. Demonstrating high adsorption capacity and dye mineralization supports the use of 1DLs in water treatment and self-sensitization for photoelectrochemical devices, like solar cells.
研究了具有纤铁矿结构的真正一维二氧化钛纳米丝（1DLs）对有毒污染染料——水溶液中孔雀石绿（MG）的吸附和光催化降解性能。通过紫外可见光谱监测脱色情况，通过总有机碳分析确认矿化情况。利用扫描电子显微镜和X射线衍射对1DL/MG絮凝物进行表征。1DLs是一种胶体纳米材料，在表现出对MG的高亲和力的同时还具有絮凝行为，通过离子交换作用，其最大吸附量迅速超过680 mg/g。此外，与大多数现有的二氧化钛产品不同，1DLs通过自敏化效应在可见光下使MG脱色。在1个太阳光照强度的可见光照射下，1DLs在30分钟内可使MG脱色超过70%。与直觉相反的是，随着1DL质量归一化浓度的降低，染料吸附量增加。1DLs表现出的高吸附容量和染料矿化能力支持了其在水处理以及用于太阳能电池等光电器件的自敏化方面的应用。
