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相关概念视频

Bioremediation00:46

Bioremediation

18.3K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
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Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

457
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
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Electrolysis03:00

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
165

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Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
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模拟的 PCB 脱的途径和流量,使用氧化潜力进行脱.

Xiang-Fei Sun1, Yan Xu2, Mitchell J Small3

  • 1Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 511443, China.

Environmental science & technology
|March 13, 2024
PubMed
概括

一个新的模型通过跟踪氧化还原潜力来预测多二 (PCB) 脱路径. 这种方法简化了复杂的降解过程,并确定了主要的偏脱化途径.

关键词:
形成的吉布斯自由能量.无氧降解降解无氧降解密度函数理论密度函数理论功能性脱细菌是一种功能性脱细菌.聚二乙烯的多化物.

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科学领域:

  • 环境科学 环境科学
  • 环境化学环境化学
  • 生物地质化学生物地质化学

背景情况:

  • 多双 (PCB) 在无氧环境中通过脱自然降解.
  • PCB 脱途径是复杂的,受到同源类型,微生物群落和环境因素的影响.

研究的目的:

  • 开发一种用于预测PCB脱路径和流量的新型模型.
  • 为了将复杂的脱过程简化为循序渐进的序列,使用氧化还原电位的可变性.

主要方法:

  • 开发了一个基于吉布斯自由能量,PCB度和环境条件计算氧化还原潜力的模型.
  • 在脱过程中跟踪PCB同源成分的持续变化.
  • 与四个已发表的PCB脱数据集对比,对该模型进行了评估.

主要成果:

  • 该模型准确地预测了脱路径和流动,模拟误差在2.67%至35.1%之间.
  • 在所有测试测量中,确定了偏离脱路径占主导地位.
  • 该模型成功考虑了多步脱路径,包括中间PCB同源.

结论:

  • 氧化还原潜力是预测PCB脱路径和流量的可靠指标.
  • 开发的模型可以预测脱,即使没有对特定脱细菌的先前了解.
  • 这种方法提供了一种简化但有效的方法来了解PCB的自然降解.