自组装的核心外结构MgO@TiO2作为K2CO3支持,支持直接空气捕获CO2的卓越性能
Ke Wu1, Shuai Peng1, Guojie Ye1
1State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science & Engineering, Tongji University, Shanghai 200092, P. R. China.
ACS applied materials & interfaces
|December 14, 2023
概括
直接捕获空气 (DAC) 提供了负碳潜力. 新的K2CO3/MgO@TiO2吸附剂显示出高的二氧化碳捕获能力和20个循环的稳定性,改进了传统方法.
科学领域:
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 传统的碳捕获和储存 (CCS) 技术主要减缓大气二氧化碳的增加.
- 直接捕获空气 (DAC) 提供了一条通往负碳解决方案的途径.
- 现有的DAC复合固体吸附剂,如K2CO3浸矩阵,在循环过程中面临停用问题.
研究的目的:
- 开发一种稳定高效的吸附剂,用于直接从空气中捕获二氧化碳.
- 研究核心外结构在增强吸附剂性能和寿命方面的作用.
- 为直接捕获空气应用提供替代策略.
主要方法:
- 通过自组装 (SA) 方法制造支持MgO,稳定TiO2的MgO@TiO2核心外结构.
- 用50%的K2CO3浸核心外支,以产生SA-KM@T吸附剂.
- 在300°C的20个吸附/脱附周期中评估二氧化碳捕获能力和性能.
主要成果:
- 该SA-KM@T吸附剂实现了高的二氧化碳捕获能力~126.6毫克CO2/g吸附剂.
- 吸附剂在300°C的20个吸附/脱附周期中保持了稳定的性能.
- 与K2CO3/MgO相比,核心外结构中的TiO2有效抑制了有害反应,增强了反应性,热稳定性和抗聚合性质.
结论:
- MgO@TiO2核心外结构为基于K2CO3的直接捕获空气吸附剂提供了有效的支持.
- 这种新型吸附剂表现出卓越的稳定性和容量,解决了以前材料的关键局限性.
- 这项研究为推进直接捕获空气技术提供了一个有希望的替代策略.
相关概念视频
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
01:32Chemiosmosis
98.8K
Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
98.8K
03:45Formation of Complex Ions
23.7K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.7K
02:47Voltaic/Galvanic Cells
57.3K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
57.3K
01:09Colloidal precipitates
593
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
593
00:59COP Coated Vesicles
7.8K
Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of...
7.8K