有效的可见光固定与BiOBr在暴露的 {001} 面部上的氧气空缺的纳米片
Journal of the American Chemical Society
|April 16, 2015
概括
研究人员开发了一种使用可见光和BiOBr纳米片合成氨的新方法. 这种光催化工艺在温和条件下有效地将大气中的 (N2) 转化为氨 (NH3),为能源密集的哈伯-博斯工艺提供了可持续的替代方案.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 绿色化学 绿色化学
背景情况:
- 哈伯 - 博什工艺虽然对农业至关重要,但却是非常能源密集的.
- 酶酶在温和条件下将大气中的 (N2) 生物学上固定为氨 (NH3).
- 开发可持续和节能的氨合成方法是一个关键的科学挑战.
研究的目的:
- 用可见光光催化剂证明有效地将固定在氨中.
- 探索使用氧化甲 (BiOBr) 纳米片与氧气空缺作为催化剂的应用.
- 在水环境中在环境温度和压力下实现氨合成.
主要方法:
- 合成具有量身定制的氧气空缺的BiOBr纳米片.
- 使用可见光照射,用光催化剂将N2减少为NH3.
- 使用光谱和分析技术对催化活性和机制的表征.
- 在室温,大气压和在没有清洁剂或共催化剂的水中运行.
主要成果:
- 通过使用可见光激活的BiOBr纳米板实现了N2到NH3的高效转化.
- 在BiOBr纳米片中的氧气空缺被确定为N2激活的关键活性位点.
- 该工艺显示出对生产氨的高度选择性.
- 催化系统在没有贵金属或有机杂物的情况下有效运行.
结论:
- 使用工程化BiOBr纳米板的可见光驱动光催化剂为氨合成提供了一个有希望的低能耗途径.
- 在BiOBr {001} 面上设计的氧气空隙有助于N2的激活和减少.
- 这项工作提出了一种可持续氨生产的新方法,有可能减少对哈伯-博斯工艺的依赖.
相关概念视频
Carbon-dioxide Fixation
895
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
895
Inorganic Nitrogen Assimilation
862
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
862
Anoxygenic Photosynthesis
1.8K
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
1.8K
Oxygenic Photosynthesis
1.0K
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
1.0K
Photoluminescence: Applications
1.3K
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
1.3K


