在绿色条件下使用ZnIn2S4进行芳香醇的高效光催化部分氧化
Muhammad Umair1, Claudio Maria Pecoraro1, Francesco Di Franco1
1Engineering Department, University of Palermo, Viale delle Scienze Ed. 6, 90128, Palermo, Italy.
ChemSusChem
|June 12, 2024
概括
一种新的印二硫化物 (ZnIn2S4) 合成方法使用无害的氨酸,取代有毒的氨酸. 这种新材料在阳光下有效催化酒精氧化成化物,性能优于TiO2 P25.
科学领域:
- 材料科学 材料科学 材料科学
- 光催化作用的光催化
- 绿色化学 绿色化学
背景情况:
- 像ZnIn2S4 (ZIS) 这样的第三级石化素是有前途的光催化剂.
- 传统的合成通常涉及危险的前体,如 thiacetamide.
- 在有机合成中,将酒精有效和选择性氧化为化物至关重要.
研究的目的:
- 为ZnIn2S4.4开发一个更绿色的合成路径.
- 为了评估合成的ZIS对酒精氧化的光催化活性.
- 为了比较ZIS的性能与基准光催化剂,TiO2 P25.
主要方法:
- 用尿素作为前体的 ZnIn2S4 的水热合成.
- 在水溶液中对芳香醇 (4-甲氧基醇,piperonyl酒精,醇) 的光催化部分氧化.
- 模拟太阳光照射和环境条件.
- 分析光催化性能,包括转换和选择性,使用诸如GC-MS (气相色谱-质谱) 等技术.
主要成果:
- 通过使用硫尿素的热水法成功合成了ZnIn2S4,避免了有毒的 thiacetamide.
- 与TiO2 P25相比,ZnIn2S4表现出优越的光催化活性,用于将各种芳香醇氧化为化物.
- 对于4-甲基醇 (46%的转化率),piperonyl酒精 (81%的转化率) 和醇 (25%的转化率) 的ZIS实现了高选择性 (>99%) 对化物.
结论:
- 尿素是ZIS合成的可行和更安全的替代前体.
- 合成的ZnIn2S4在温和条件下表现出优异的光催化效率和酒精氧化选择性.
- 这项研究提出了一种更绿色,更有效的方法,使用ZIS光催化剂生产阿尔代.
相关概念视频
Radical Oxidation of Allylic and Benzylic Alcohols
1.9K
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
1.9K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.1K
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.
10.1K
Oxidative Cleavage of Alkenes: Ozonolysis
10.2K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
10.2K
Oxidation of Alcohols
13.0K
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
13.0K
Oxidation of Phenols to Quinones
3.0K
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...
3.0K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
11.3K
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
11.3K

![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
