相关实验视频
Updated: Jun 28, 2025

07:08
CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
Published on: June 12, 2019
6.8K
基于CdS的热水光催化剂,用于通过可见光在水中通过可见光完全减少化酸的脱化
Martina Milani1, Michele Mazzanti1, Claudia Stevanin2
1Dipartimento di Scienze Chimiche, Farmaceutiche ed Agrarie, Università di Ferrara, Via Luigi Borsari 46, 44121 Ferrara, Italy.
Nanomaterials (Basel, Switzerland)
|April 12, 2024
概括
一种新的硫化 (CdS) 光催化剂,CdS-HTa,有效地从水中去除持久有机污染物达拉. 这种材料稳定,可回收利用,在温和条件下工作,为水处理提供了有前途的解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 光催化作用的光催化
背景情况:
- 像达拉这样的持久有机污染物在水处理方面带来了重大挑战.
- 开发高效和稳定的光催化剂对于环境修复至关重要.
- 硫化 (CdS) 是已知的光催化剂,但其效率和稳定性可以得到改善.
研究的目的:
- 使用热水方法合成和描述一种基于硫化 (CdS) 的新型光催化剂CdS-HTa.
- 评估CdS-HTa的光催化活性,以减少达拉的脱.
- 调查CdS电子结构和光催化性能之间的相关性.
主要方法:
- 使用CdCl2和thiourea进行CdS-HTa的热水合成.
- 使用X射线衍射 (XRD) 和UV-Vis光谱法进行表征,以确定晶度和带间隙.
- 光电化学测量以评估光电位.
- 在温和条件下对达拉降解进行光催化实验.
- 高性能液体染色学-质谱学 (HPLC-MS) 用于产品分析.
主要成果:
- CdS-HTa具有晶体结构,带间距为2.31 eV,减少光电位为-0.9 V.
- CdS-HTa在达拉降低性脱化到酸方面表现出比商业CdS更高的活性.
- 光催化性能与CdS的电子结构有关.
- 达拉的完整降解过程通过2 - 单二酸转化为酸.
- 在多个循环过程中,CdS-HTa表现出稳定性和可回收性,并且没有显著的活性损失.
结论:
- 合成的CdS-HTa是一种高效的光催化剂,用于在温和条件下减少达拉的脱化.
- CdS-HTa为从水中去除持久有机污染物提供了一个有希望的解决方案.
- 该研究强调了电子结构在优化光催化剂性能方面的重要性.
相关概念视频
Acid Halides to Carboxylic Acids: Hydrolysis
2.6K
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
2.6K
Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
1.8K
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
1.8K
Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.8K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.3K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
4.5K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
4.5K
Radical Substitution: Allylic Chlorination
2.2K
Typically, when alkenes react with halogens at low temperatures, an addition reaction occurs. However, upon increasing the temperature or under reaction conditions that form radicals, providing a low but steady concentration of halogen radicals, allylic substitution reaction is favored. This is because allylic hydrogens are very reactive as the formed intermediate is resonance stabilized. For example, when propene is treated with chlorine in the gas phase at 400 °C, it undergoes allylic...
2.2K
![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
