Review and Perspectives of CO₂ Absorption by Water- and Amine-Based Nanofluids

Abstract

The emission of greenhouse gases, especially CO2, has become a major cause of environmental degradation, and carbon capture, utilization, and storage (CCUS) is a proposed solution to mitigate its impact. Nanofluids, a relatively new method for CO2 absorption, have gained attention in recent years. This review focuses on conventional methods for preparing nanofluids along with techniques to improve their stability and enhance the CO2 absorption and desorption mechanisms. Additionally, the influences of factors, i.e., nanoparticle and base solution types as well as nanoparticle concentration, on the CO2 absorption process are summarized. Furthermore, models that can predict the absorption of CO2 accurately are outlined. It is found that the types of both base liquids and nanoparticles have an important impact on the absorption by nanofluids. In-depth studies on the predictive capabilities of artificial intelligence (AI) models hold immense potential in this regard. This review also puts forth effective strategies to address prevailing challenges. This will provide a solid theoretical basis for this field and underscore the promising potential of nanofluids as CO2 solvents. There are still many unexplored aspects to be considered, such as the economic viability and energy consumption of this technology.

Responsive CO2 capture: predictive multi-objective optimisation for managing intermittent flue gas and renewable energy supply

“…11 Alongside enhanced weathering (EW), other promising methods have emerged, such as direct air capture (DAC), 12 bioenergy with CO 2 capture and storage (BECCS), 13 afforestation and reforestation (AR), 14 photochemical CO 2 conversion, 15 electrochemical reduction. 16 Recently added to this list are innovative methods like CO 2 capture using water- and amine-based nanofluids 17 and metal–organic frameworks (MOFs). 18 Among these, EW is particularly notable for its use of crushed alkaline minerals and chemical contactors to significantly accelerate the natural weathering process.…”

Multistage Circulation Absorption Improvement: Simulation and Energy-Saving Evaluation of an Innovative Amine-Based CO2 Capture Process

“…9 MEA, chosen widely as an amine-based absorbent in the PCCC process, has high chemical reactivity and good kinetic properties. 10 However, its application is hindered by the substantial regeneration energy requirement (∼3.7 GJ/t CO 2 ), 11 as well as its propensity for corrosion and ease of T h i s c o n t e n t i s degradation. 12 The high regeneration duty in the MEA process primarily stems from the high absorption reaction heat of MEA, which is 87−93 kJ/mol CO 2 .…”

“…Although tertiary amines typically have lower regeneration energy requirements, the application is limited by their comparatively slow reaction rates . MEA, chosen widely as an amine-based absorbent in the PCCC process, has high chemical reactivity and good kinetic properties . However, its application is hindered by the substantial regeneration energy requirement (∼3.7 GJ/t CO 2 ), as well as its propensity for corrosion and ease of degradation .…”

Interfacial-interaction induced modifications in segmental dynamics and free volume of the poly(ethyleneimine) canopy in nanoparticle–organic hybrid materials: an investigation by temperature dependent broadband dielectric and positron annihilation spectroscopy

“…Nanoparticle-organic hybrid materials (NOHMs) are an emerging class of materials 1 showing great potential for diverse applications in thermal management fluids, 2 nanocomposites, 3,4 electrolytes, 5,6 CO 2 capture solvents, [7][8][9][10][11] and lubricants. 12 Liquid-like NOHMs are solvent-free fluids consisting of a functionalized inorganic nanodimensional corona type of core (nanocores) and oligomeric or polymeric chains.…”

“…12 Liquid-like NOHMs are solvent-free fluids consisting of a functionalized inorganic nanodimensional corona type of core (nanocores) and oligomeric or polymeric chains. 1,7 These chains, which are bonded directly to the nanocores either through covalent or ionic-bonds, are referred to as a canopy in the case of liquid-like NOHMs. NOHMs exhibit versatile physico-chemical properties due to the complex intermolecular and intramolecular interactions between the charged inorganic nanocores and organic canopy, and the tethered as well as free canopy.…”