论文标题
具有增强的光学和光催化特性
Novel C-dots/titanate nanotubular hybrid materials with enhanced optical and photocatalytic properties
论文作者
论文摘要
通过快速的一锅合成成功制备了具有有机污染物的光降解（尤其是药物和个人护理产品（PPCP））光降解的光学和光催化特性的高级纳米材料。纳米结构的材料是通过集成的热液程序合成的，该过程从氧化二钛的基于氧化钛的来源和科克工业废料（CIWWS）作为碳来源生成带有不同碳点（C点）含量的钛纳米酸盐（TNT）。通过XRD，TEM，UV-VIS扩散反射率和光致发光光谱研究，研究了它们的结构，微结构，形态和光学特性。与原始的TNT相比，杂种C点/TNT纳米材料将其光吸收扩展到红色，从而促使它们通过扩大TNTS能量吸收范围来更有效地在光催化中使用光。随着样品的C点含量的增加，带隙能量的减少似乎起源于在TNTS禁止带中形成的中间状态，这些状态是由TI-O-C键在TNTS和形成状态尾巴的C点之间建立的。在咖啡因作为污染物模型的光降解中测试了合成的C点/TNT样品。获得了奖励结果，与原始TNT相比，混合CDOTS/TNT纳米材料显示出显着增强的咖啡因降解能力。还旨在表征在半导体光激活过程中形成的最具反应性物种，从而评估可能的反应性途径，从而在没有氧气的情况下进行光催化测定和/或没有氧气，旨在表征为基于混合C-DOTS/TNT NANANANAMERATIALS的光催化活性的可能的反应途径进行评估。
Advanced nanomaterials with enhanced optical and photocatalytic properties for the photodegradation of organic pollutants, in particular pharmaceuticals and personal care products (PPCPs), were successfully prepared by a swift one-pot synthesis. Nanostructured materials were synthesized through an integrated hydrothermal procedure which generates titanate nanotubes (TNTs) with different carbon dots (C-dots) contents, from an amorphous titanium oxide-based source and cork industry wastewaters (CIWWs) as carbon source. Their structural, microstructural, morphological, and optical properties were studied by XRD, TEM, UV-Vis diffuse reflectance and photoluminescence spectroscopies. As aimed, the hybrid C-dots/TNT nanomaterials extend their light absorption towards the red, in comparison to pristine TNTs, prompting them for a more efficient use of light in photocatalysis by widening the TNTs energy uptake range. The decrease of bandgap energy with increasing sample's C-dots content seems to be originated from energy intermediate states formed within the TNTs forbidden band resulting from Ti-O-C bonds established between the TNTs and the C-dots that form tails of states. The as-synthesized C-dots/TNT samples were tested in the photodegradation of caffeine as a pollutant model. Rewarding results were obtained, with the hybrid C-dots/TNT nanomaterials showing significant enhanced photocatalytic ability toward caffeine degradation in comparison to pristine TNTs. Photocatalysis assays in the presence of scavengers and/or in the absence of oxygen were also performed aiming to characterize the most reactive species formed during the semiconductor photo-activation process and thus assessing to possible reactive pathways underpinning the photocatalytic activity of the hybrid C-dots/TNT nanomaterials.
