Morphology Design and Fabrication of Bio-Inspired Nano-MgO–Mg(OH)2 via Vapor Steaming to Enable Bulk CO2 Diffusion and Capture

Abstract

The absorption of CO2 on MgO is being studied in depth in order to enhance carbon engineering. Production of carbonate on MgO surfaces, such as MgCO3, for example, has been shown to hinder further carbon lattice transit and lower CO2 collecting efficiency. To avoid the carbonate blocking effect, we mimic the water harvesting nano-surface systems of desert beetles, which use alternate hydrophobic and hydrophilic surface domains to collect liquid water and convey condensed droplets down to their mouths, respectively. We made CO2-philic MgO and CO2-phobic Mg(OH)2 nanocomposites from electrospun nano-MgO by vapor steaming for 2–20 min at 100 °C. The crystal structure, morphology, and surface properties of the produced samples were instrumentally characterized using XRD, SEM, XPS, BET, and TGA. We observed that (1) fiber morphology shifted from hierarchical particle and sheet-like structures to flower-like structures, and (2) CO2 capture capacity shifted by around 25%. As a result, the carbonate production and breakdown processes may be managed and improved using vapor steaming technology. These findings point to a new CO2 absorption technique and technology that might pave the way for more CO2 capture, mineralization, and fuel synthesis options.

Enhancing MgO efficiency in CO2 capture: engineered MgO/Mg(OH)2 composites with Cl−, SO42−, and PO43− additives

“…Therefore, the hydrates may aided the better performance of the Cl − doped nano composites. 29 Structures with uniform surfaces, with a typical 2-dimensional diffusion mode. The 10% Cl − doped MgO showed a similar structure to 5% Cl − doped MgO presenting sheet-like uniform structure.…”

“…This is to eliminate the total obstruction of surface by the formed MgCO 3 and allow new CO 2 molecules to further absorbed through, as demonstrated in our previous study via a steaming process within the MgO–H 2 O binary system. 29 The CO 2 -philic (MgO) and CO 2 -phobic (Mg(OH) 2 ) domains in the sample further aid adsorbing additional fresh CO 2 molecules, despite the persistence of intermittent MgCO 3 precipitations neighboring MgO. 34 CO 2 -philic parts are mainly for CO 2 capturing while the CO 2 -phobic parts provide CO 2 transport channels, which are unavailable in MgO.…”

“…This technique has shown a remarkable improvement of approximately 25% in CO 2 adsorption. 29 Theoretical investigations on MgO–CaO composites incorporating Li, Na, K, and Rb promoters have revealed the successful utilization of Li dopants, which lead to changes in the properties of crystal surfaces, ultimately attracting CO 2 . 30 However, the practical implementation of these active compounds raises concerns regarding environmental safety.…”

Carbon Dioxide Capture, Utilization, and Sequestration: Current Status, Challenges, and Future Prospects for Global Decarbonization

“…CO 2 mineralization, also known as carbonation, is a process that involves the reaction of CO 2 with naturally occurring minerals to form stable carbonate compounds. This process occurs naturally over geological timescales, but there has been growing interest in accelerating and optimizing the process as a potential CO 2 sequestration technique. ,− …”

Effect of Polyethylene Glycol on Preparation of Magnesium Hydroxide by Electrodeposition

“…With the shortage of resources and the improvement of human awareness of ecological resources protection, relevant experts and scholars began to focus on the treatment and application of bischofite resources. These research directions mainly include the preparation of metal magnesium by molten salt electrolysis and the preparation of Mg(OH) 2 by alkaline neutralization [4][5][6]. Molten salt electrolysis requires dehydration of bischofite, which is difficult to industrialize, can be described as a worldwide problem [7,8].…”