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相关概念视频

The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

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...
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
Photoluminescence: Applications01:14

Photoluminescence: Applications

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...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

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 light...

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相关实验视频

Updated: Jul 15, 2026

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
05:47

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

介孔二氧化的吸附驱动的光催化活性介孔二氧化.

Yasuhiro Shiraishi1, Naoya Saito, Takayuki Hirai

  • 1Research Center for Solar Energy Chemistry, and Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan.

Journal of the American Chemical Society
|September 15, 2005
PubMed
概括

半孔二氧化在水中表现出高的光催化活性,通过"粘和离开"机制将转化为. 这个过程有效地利用水作为氧化剂进行选择性氧化.

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
  • 有机合成 有机合成

背景情况:

  • 二氧化 (TiO2) 是一个广泛研究的光催化剂.
  • 从中有效和选择性地合成是一种具有挑战性的化学转化.
  • 开发使用水作为氧化剂的可持续氧化方法至关重要.

研究的目的:

  • 为了研究水中的中孔二氧化的光催化活性.
  • 阐明氧化中观察到的高选择性背后的机制.
  • 为了展示一种用于直接合成的新的"粘和离开"转换.

主要方法:

  • 半孔二氧化的合成.
  • 在水溶液中光激活催化剂.
  • 使用光谱技术分析反应产物和中间体.
  • 在可见光照射下进行烯氧化实验.

主要成果:

  • 半孔二氧化在水中表现出前所未有的光催化活性.
  • 在分子吸附和催化转化之间观察到强烈的相关性.
  • "坚持并离开"机制促进了选择性转化为的转化 (>80%的选择性).
  • 水被有效地用作氧化剂来源.

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CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light

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A Complete Method for Evaluating the Performance of Photocatalysts for the Degradation of Antibiotics in Environmental Remediation
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A Complete Method for Evaluating the Performance of Photocatalysts for the Degradation of Antibiotics in Environmental Remediation

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Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
05:47

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts

Published on: August 7, 2018

CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
07:08

CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light

Published on: June 12, 2019

A Complete Method for Evaluating the Performance of Photocatalysts for the Degradation of Antibiotics in Environmental Remediation
08:30

A Complete Method for Evaluating the Performance of Photocatalysts for the Degradation of Antibiotics in Environmental Remediation

Published on: October 6, 2022

结论:

  • 半孔二氧化是选择性氧化的高效光催化剂.
  • "坚持和离开"转换为挑战合成反应提供了一条新的途径.
  • 这种方法为使用水作为氧化剂的生产提供了一种可持续的方法.