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Related Concept Videos

Carbonation Shrinkage01:24

Carbonation Shrinkage

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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.
The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction...
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Turbulent Flow: Problem Solving01:09

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Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
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Carbon-dioxide Fixation01:28

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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Bicarbonate-Carbonic Acid Buffer01:22

Bicarbonate-Carbonic Acid Buffer

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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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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Room temperature bio-engineered multifunctional carbonates for CO2 sequestration and valorization.

H Mohamed1,2,3, K Hkiri1,2, N Botha1,2

  • 1UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, PO Box 392, Pretoria, South Africa.

Scientific Reports
|October 5, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel green bio-engineering method to create 1-D nano-scaled calcite (CaCO3) using only water and natural plant extract. This cost-effective process yields versatile nanoparticles for pigments, fertilizers, and cement applications.

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Area of Science:

  • Green Chemistry
  • Nanotechnology
  • Biomaterials Engineering

Background:

  • Traditional calcium carbonate (CaCO3) synthesis often involves harsh chemicals and energy-intensive conditions.
  • There is a growing demand for sustainable and eco-friendly nanomaterial production methods.

Purpose of the Study:

  • To report the first entirely green bio-engineering approach for synthesizing single-phase crystalline 1-D nano-scaled calcite (CaCO3).
  • To explore the potential applications of the bio-engineered CaCO3 nanoparticles.

Main Methods:

  • Utilized water as the sole solvent and a natural extract from Hyphaene thebaica fruit as a chelating agent.
  • Employed calcium chloride (CaCl2) and carbon dioxide (CO2) as the only sources for calcium and carbonate ions.
  • Conducted the synthesis at room temperature and atmospheric pressure without additional catalysts or pH modifiers.

Main Results:

  • Successfully synthesized 1-D nano-scaled calcite (CaCO3) with significant shape anisotropy and a high surface-to-volume ratio.
  • The bio-engineered CaCO3 exhibited functionalities as a highly reflecting pigment, an effective nanofertilizer, and a potential binder in the cement industry.

Conclusions:

  • The developed process is a cost-effective, environmentally benign alternative for CaCO3 nanoparticle production.
  • The unique properties of the bio-engineered CaCO3 open avenues for sustainable applications in various industries.