TiC和TiCN的氧化行为及其在半氧化状态下潜在的光催化活性
Shiyun Tang1, Guoqiang Song2, Junjiang Guo1
1School of Chemical Engineering, Guizhou Institute of Technology Guiyang 550003 China.
Nanoscale advances
|July 14, 2025
概括
研究了碳化物 (TiC) 和碳化物 (TiCN) 的氧化. 在半氧化后,TiCN比TiC更好地显示了罗达胺B的光催化降解.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 环境科学 环境科学
背景情况:
- 碳化 (TiC) 和碳化 (TiCN) 是具有独特特性的先进陶材料.
- 它们的氧化行为对于理解它们的稳定性和潜在应用至关重要.
- 光催化降解是环境修复的一个关键过程.
研究的目的:
- 为了研究TiC和TiCN在环境空气中的氧化行为.
- 探索氧化TiC和TiCN的光催化降解活性.
- 为了比较TiC和TiCN的氧化阻力和光催化性能.
主要方法:
- 在不同温度下氧化TiC和TiCN.
- 使用X射线衍射 (XRD),扫描电子显微镜 (SEM),热重力测量-差异扫描热量测量 (TG-DSC) 和温度编程氧化红外线 (TPO-IR) 的表征.
- 使用罗达胺B (RhB) 降解和UV-Vis扩散反射光谱 (DRS) 和X射线光电子光谱 (XPS) 评估光催化活性.
主要成果:
- 与TiCN相比,TiC表现出更高的氧化阻力.
- 这两种材料都被氧化成 rutile TiO2,TiC 直接氧化,TiCN 通过 O 进行 C 替换,然后 N.
- 在400°C (TiC) 和500°C (TiCN) 的优化半氧化产生了增强的光催化活性.
- 氧化TiCN与氧化TiC (3.85%的残留量) 相比,RhB的吸附和降解 (9.37%的残留量) 更好.
- 证实了N和/或C内改性TiO2的形成.
结论:
- TiC和TiCN经历了不同的氧化途径,两者都产生了鲁基TiO.
- 半氧化TiCN显示了RhB的增强光催化降解能力,这是由于吸附度的提高和TiO2结构的修改.
- 这项研究突出了针对光催化应用的TiC和TiCN定制氧化的潜力.
相关概念视频
Oxidation of Phenols to Quinones
3.5K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
3.5K
Reactions at the Benzylic Position: Oxidation and Reduction
4.0K
The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.
4.0K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.8K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.8K
Redox Titration: Other Oxidizing and Reducing Agents
400
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
400
Properties of Transition Metals
27.3K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
27.3K
Oxidations of Aldehydes and Ketones to Carboxylic Acids
4.2K
Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
4.2K


