Engineered Nanoparticle Interfaces Optimize Phase Change Behavior through Enhanced Mass- and Heat-Transfer for...

Area of Science:

• Chemical Engineering
• Materials Science
• Environmental Science

Background:

• Industrial carbon dioxide (CO2) absorbents struggle with slow phase transition, separation, and reaction kinetics, especially under fluctuating conditions.
• Existing technologies often require significant energy for regeneration and face stability issues.
• Developing efficient and stable CO2 capture materials is crucial for mitigating climate change.

Purpose of the Study:

• To engineer a novel ionic liquid-based nanofluid absorbent for enhanced CO2 capture performance and operational stability.
• To investigate the role of nanoparticles in improving phase transition and reaction kinetics.
• To assess the long-term stability and energy efficiency of the developed absorbent.

Main Methods:

• Formulation of a nanofluid absorbent using a functionalized ionic liquid ([tetraethylenepentamine][1,2,4-triazole]), titanium dioxide nanoparticles, and a solvent mixture (1-methoxy-2-propanol and water).
• Evaluation of phase separation time, regeneration efficiency, and CO2 loading capacity.
• Characterization of nanoparticle effects on interfacial phenomena, mass transfer, thermal properties, and long-term stability over 60 cycles.
• Bench-scale continuous operation for 168 hours to assess CO2 capture capability and energy consumption.
• Life-cycle assessment comparing the technology with monoethanolamine (MEA).

Main Results:

• The nanofluid absorbent reduced phase separation time by 53.85% and increased regeneration efficiency from 79.59% to 91.72%.
• Nanoparticles suppressed droplet coalescence, stabilized the phase interface, decreased mass-transfer resistance by 38.0%, and enhanced thermal properties.
• The nanofluid demonstrated exceptional stability over 60 cycles with <20% performance degradation.
• Bench-scale operation achieved a record-low regeneration energy consumption of 1.81 GJ·t CO2−1.
• Life-cycle assessment indicated superior environmental sustainability compared to monoethanolamine technology.

Conclusions:

• The developed ionic liquid-based nanofluid absorbent offers a promising solution for efficient and stable industrial CO2 capture.
• Nanoparticle integration is key to overcoming limitations of traditional absorbents, improving kinetics and energy efficiency.
• This technology presents a more sustainable and cost-effective alternative for carbon capture applications.