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Carbon-dioxide Fixation

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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...
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Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Transforming Carbon Dioxide into Rocks!? Experiments for Understanding Carbon Dioxide Removal through Chemical

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Summary

Hands-on chemistry experiments demonstrate carbon dioxide removal via chemical weathering of basalt. These safe, accessible classroom activities teach carbon capture and storage principles, enhancing understanding of the carbon cycle.

Keywords:
Carbon Capture and StorageChemical WeatheringDemonstrationsEnvironmental ChemistryHands-On LearningIndustrial ChemistryIntroductory ScienceMiddle School ScienceWater Chemistry

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Area of Science:

  • Environmental Chemistry
  • Educational Chemistry

Background:

  • Chemical weathering is a key geological process for carbon dioxide removal.
  • Understanding carbon capture and storage (CCS) is crucial for climate change mitigation.

Purpose of the Study:

  • To present hands-on experiments for teaching carbon dioxide removal through chemical weathering.
  • To introduce middle and high school students to carbon capture and storage principles using basalt weathering.

Main Methods:

  • Experiments utilize simple materials like PET bottles and basalt.
  • Continuous monitoring of dissolved carbon dioxide and pH changes visualizes bicarbonate formation.
  • Demonstrates carbon dioxide solubility in water and chemical trapping processes.

Main Results:

  • Successful demonstration of carbon dioxide removal via basalt weathering.
  • Students gain practical experience with carbon capture and storage mechanisms.
  • Enhanced understanding of the carbon cycle and geological carbon sequestration.

Conclusions:

  • The experiments are safe, feasible, and accessible for classroom settings.
  • This educational approach fills a gap in teaching carbon dioxide removal and CCS.
  • Empowers students to engage in climate change discussions and solutions.