Carbon Capture Using Porous Silica Materials

• Published in: Nanomaterials (Basel, Switzerland) Vol. 13; no. 14; p. 2050
• Main Authors: Amaraweera, Sumedha M, Gunathilake, Chamila A, Gunawardene, Oneesha H P, Dassanayake, Rohan S, Cho, Eun-Bum, Du, Yanhai
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 11-07-2023; MDPI
• Subjects: Adsorbents; Adsorption; Aluminum oxide; amine functionalized porous silica; Amines; Anthropogenic factors; Carbon dioxide; Carbon dioxide emissions; Carbon sequestration; Chemical synthesis; Climate; Climate change; CO2 adsorption; CO2 capture technologies; decarbonization; Drought; Emissions; Energy consumption; Flash floods; Flue gas; Gases; Global temperatures; Global warming; Greenhouse effect; Greenhouse gases; Heat waves; Industrial plant emissions; Outdoor air quality; Porous materials; porous silica; Power plants; Rainfall; Reaction mechanisms; Review; Sea level rise; Silica; Silicon dioxide; Snowstorms; Solvents; Sorbents; Surface stability; Technology; Zeolites; amine functionalized porous silica; decarbonization; CO2 capture technologies; porous silica; CO2 adsorption
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano13142050

As the primary greenhouse gas, CO
emission has noticeably increased over the past decades resulting in global warming and climate change. Surprisingly, anthropogenic activities have increased atmospheric CO
by 50% in less than 200 years, causing more frequent and severe rainfall, snowstorms, flash floods, droughts, heat waves, and rising sea levels in recent times. Hence, reducing the excess CO
in the atmosphere is imperative to keep the global average temperature rise below 2 °C. Among many CO
mitigation approaches, CO
capture using porous materials is considered one of the most promising technologies. Porous solid materials such as carbons, silica, zeolites, hollow fibers, and alumina have been widely investigated in CO
capture technologies. Interestingly, porous silica-based materials have recently emerged as excellent candidates for CO
capture technologies due to their unique properties, including high surface area, pore volume, easy surface functionalization, excellent thermal, and mechanical stability, and low cost. Therefore, this review comprehensively covers major CO
capture processes and their pros and cons, selecting a suitable sorbent, use of liquid amines, and highlights the recent progress of various porous silica materials, including amine-functionalized silica, their reaction mechanisms and synthesis processes. Moreover, CO
adsorption capacities, gas selectivity, reusability, current challenges, and future directions of porous silica materials have also been discussed.