来自咖啡废物的富含氧气碳量子点:极其活跃的有机光催化剂,可可持续地将太阳能转化为H
Do-Yeon Lee1, Zeeshan Haider2, Siva Kumar Krishnan3
1Department of Civil and Environmental Engineering, Yonsei University, 50 Yonsei-ro, Seoul, 03722, Republic of Korea.
Chemosphere
|May 17, 2024
概括
研究人员从咖啡废物中开发了富含氧的碳量子点,用于高效的太阳能过氧化生产. 这种环保方法为人工光合作用提供了一个有前途的无金属光催化剂.
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:
- 太阳能驱动的人工光合作用是可持续生产过氧化 (H2O2) 的关键领域.
- 目前的方法在两电子氧降解反应 (ORR) 中面临效率和选择性挑战.
- 开发高效的无金属光催化剂对于大规模生产H2O2至关重要.
研究的目的:
- 从消耗的咖啡废物中合成富含氧的碳量子点 (OE-CQD).
- 评估OE-CQD作为太阳能驱动H2O2生产的光催化剂.
- 调查OE-CQDs在增强电荷分离和ORR活动中的作用.
主要方法:
- 从消耗的咖啡废物中合成OE-CQDs的生物质辅助合成.
- 在太阳辐射下对H2O2生成的光催化评估.
- 对OE-CQD的结构性和电子性质进行表征.
主要成果:
- 使用OE-CQDs实现了最大的H2O2生成速度为356.86μmol g-1h-1.
- 在没有牺牲捐赠者的情况下保持了80%的活性,证明了催化剂的寿命.
- 在280nm波长下,观察到H2O2生成的量子产量为9.4%.
- OE-CQD有效地稳定和储存光生成的电子,促进电荷分离.
结论:
- 从废弃生物质中合成的OE-CQD作为太阳能H2O2生产的高效,无金属的光催化剂.
- 氧气丰富和OE-CQD的晶体结构通过改善电荷转移和氧气扩散来增强ORR活动.
- 这种环保方法为可持续和成本效益的H2O2制造提供了一个可行的策略.
相关概念视频
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
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
Oxidative Cleavage of Alkenes: Ozonolysis
10.3K
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.
10.3K
The Z-Scheme of Electron Transport in Photosynthesis
10.1K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
10.1K
Chemiosmosis
98.2K
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...
98.2K
Oxidation 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


