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  1. 首页
  3. 研究领域
  5. 化学科学
  7. 物理化学
  9. 体和表面化学
  11. 影响空气-水界面的自发h2o2形成
  1. 首页
  3. 研究领域
  5. 化学科学
  7. 物理化学
  9. 体和表面化学
  11. 影响空气-水界面的自发h2o2形成

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影响空气-水界面的自发H2O2形成

Maria Angelaki1, Jill d'Erceville1, D James Donaldson2,3

  • 1Universite Claude Bernard Lyon 1, CNRS, IRCELYON, UMR 5256, Villeurbanne, F-69100, France.

Journal of the American Chemical Society
|September 16, 2024

在PubMed 上查看摘要

概括
此摘要是机器生成的。

酸度会影响微滴在空气-水界面上形成过氧化 (H2O2). 性条件和溶解的二氧化碳对H2O2产生影响,而离子则没有pH依赖.

科学领域:

  • 大气化学
  • 环境科学
  • 物理化学

背景情况:

  • 微滴的空气-水界面是大气氧化剂的重要来源,如基 (OH) 和过氧化 (H2O2).
  • 诸如液滴大小,盐度和有机含量等因素影响氧化剂的形成,但酸度的作用需要进一步研究.

研究的目的:

  • 研究酸度对含盐的水性微滴中自发的表面过氧化形成的影响.
  • 了解pH和溶解的二氧化碳如何影响空气-水界面的H2O2产生.

主要方法:

  • 硫酸 (Na2SO4),化 (NaCl) 和化 (NaBr) 溶液在4至9.5的pH范围内进行雾化.
  • 使用超高纯度N2/O2气体在受控温度 (292 ± 1K) 和湿度 (90 ± 2%) 下收集微滴并测量H2O2度.
  • 将二氧化碳添加到气中,以评估其对H2O2形成的影响.

主要成果:

  • 在性条件下,Na2SO4和NaCl滴的H2O2度增加了约40%,这表明OH-促进了生成.
  • 溶解的二氧化碳在较高的pH值下降了H2O2水平,这表明二氧化碳干扰了界面H2O2的产生.
  • 在NaBr滴中形成的H2O2不依赖于pH或浴气,突出了Br-作为电子来源的作用.

结论:

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The pH of a solution containing an acid can be determined using its acid dissociation constant and initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending on the relative strength of the acids and their dissociation constants.
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Acid–Base Equilibria: Activity-Based Definition of pH

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For an ideal solution, the pH is defined as the negative logarithm of the hydrogen ion concentration. For a non-ideal solution, an accurate measurement of the pH must consider the negative logarithm of the hydrogen ion activity rather than concentration. In such a solution, the pH can be more accurately defined as the negative logarithm of a product of the hydrogen ion concentration and its activity coefficient.
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Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
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  • 酸度显著影响 H2O2 界面的形成,性条件有利于硫酸盐和液滴的产生.
  • 溶解的二氧化碳可以通过与OH基和电子反应来抑制界面H2O2的形成.
  • 离子作为一个高效的界面电子源,将H2O2形成与pH和浴室气体组成分离.