在Ce-Ni双层膜中的层次序对甲基烯的催化臭氧化的影响
Daynahi Franco Peláez1, Julia Liliana Rodríguez Santillán1, Tatyana Poznyak1
1Laboratorio de Investigación en Ingeniería Química Ambiental, ESIQIE-Instituto Politécnico Nacional, Zacatenco, Ciudad de México 07738, Mexico.
ACS omega
|October 6, 2025
概括
通过催化臭氧化,Ce-Ni双层薄膜有效降解甲基 (MePB). Ce-Ni (L-L) 配置显著增强了矿物化,显示了可持续的水污染清除的前景.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 先进的氧化过程 (AOP) 对于降解新兴关注污染物 (CEC) 是至关重要的.
- 使用双层薄膜的催化臭氧化提供了一个有前途的AOP策略.
- 甲基 (MePB) 是一种常见的CEC,需要有效地从水中去除.
研究的目的:
- 研究Ce-Ni双层薄膜中层次序列对催化臭氧化效率的影响.
- 用Ce-Ni催化剂评估MePB的降解和矿化情况.
- 评估开发的催化系统的稳定性和实际可用性.
主要方法:
- 通过超声波喷雾热解 (USP) 合成Ce-Ni双层薄膜.
- 用甲基作为模型的催化臭氧化实验.
- 使用XPS和激进清除者研究进行表征.
- 通过TOC分析和毒性测试进行矿化评估.
主要成果:
- 该Ce-Ni (L-L) 配置实现了58.5%的MePB矿化,超过了Ni-Ce (L-L) (38.6%).
- 催化活性归因于表面氧气空缺和Ce3+度.
- 该Ce-Ni (L-L) 薄膜在五个重复使用周期和自来水中的活性中表现出极好的稳定性.
- 经过处理的废水被发现对Lactuca sativa无毒.
结论:
- 双层Ce-Ni薄膜是通过臭氧化对MePB降解和矿物化的有效催化剂.
- 层次序显著影响催化性能,Ce-Ni (L-L) 具有优势.
- 这些薄膜是水污染清理的坚固,可重复使用和可持续的平台.
相关概念视频
01:46Oxidative Cleavage of Alkenes: Ozonolysis
12.7K
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.
12.7K
03:08Hydroboration-Oxidation of Alkenes
11.1K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
11.1K
02:35Regioselectivity of Electrophilic Additions-Peroxide Effect
10.3K
In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
10.3K
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
9.5K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
9.5K
02:36Regioselectivity and Stereochemistry of Hydroboration
9.4K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
9.4K
03:00Preparation of Epoxides
9.1K
Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
9.1K