精确调节单个Cu站点催化剂的协调环境,以调节用于水整治的过氧单硫酸盐激活途径
Jie Wang1, Xiao Ge1, Weiqin Yin1
1College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225000, P. R. China.
Inorganic chemistry
|May 8, 2024
概括
具有较少协调点的单原子催化剂 (SAC) 有效地激活过氧硫酸盐 (PMS) 以在水中去除双A (BPA). 较低的协调数优化了电子转移,并提高了BPA降解性能.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 催化剂是一种催化剂.
背景情况:
- 单个原子位点催化剂 (SAC) 提供最大的金属原子利用率和精确定义的水处理结构.
- 调节酸盐激活通路对于高效的先进氧化过程 (AOP) 至关重要.
研究的目的:
- 合成和研究具有不同协调环境的铜单原子位点催化剂 (Cu SAC).
- 阐明协调号在调节氧硫酸盐 (PMS) 激活和双A (BPA) 降解中的作用.
- 了解水资源整治过程中活跃物种产生和转化的基本机制.
主要方法:
- 合成具有不同协调号码 (Cu-N2,Cu-N3,Cu-N4) 的Cu SAC.
- 在AOPs中使用PMS激活对BPA降解的催化性能的评估.
- 实验和理论分析 (包括DFT) 来确定反应途径和活性物种.
主要成果:
- 与Cu-N3和Cu-N4.4相比,Cu-N2 SAC显示出更高的BPA降解率 (kobs = 0.028 min-1),比Cu-N3和Cu-N4.
- 协调数从4下降到2将PMS激活途径从活性氧物种 (ROS) 转移到直接的电子转移.
- 性能提升归因于电荷分布不均,d频段中心上升,以及增加的空位,促进吸附.
结论:
- 在SAC中Cu位点的协调数显著影响PMS激活路径和BPA去除的催化效率.
- 通过协调调节优化电子转移和吸附过程,为设计有效的水疗催化剂提供了一个有希望的策略.
- 这项研究提供了关于定制SAC以提高环境应用中的性能的见解.
相关概念视频
02:50Catalysis
26.9K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
26.9K
02:21Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
11.4K
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.
11.4K
01:21Radical Oxidation of Allylic and Benzylic Alcohols
2.0K
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...
2.0K
02:36Oxymercuration-Reduction of Alkenes
7.5K
Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
7.5K
02:44Oxidation 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
01:13Introduction to Mechanisms of Enzyme Catalysis
8.1K
For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
8.1K