Nanowerk October 24, 2024 The development of a durable material with high capacity, fast kinetics and low regeneration temperature for CO2 capture, especially from the intricate and dynamic atmosphere, is still lacking. An international team of researchers (USA – University of California, Saudi Arabia, Germany) synthesized a porous, crystalline covalent organic framework (COF) with olefin linkages structurally characterized and post-synthetically modified by the covalent attachment of amine initiators for producing polyamines within the pores. The COF could capture CO2 from open air with a capacity of 0.96 mmol g–1 under dry conditions and 2.05 mmol g–1 under 50% relative humidity, both from 400 ppm CO2. […]
Category Archives: Carbon sequestration
Scientists discover molecules that store much of the carbon in space
MIT News October 24, 2024 Polycyclic aromatic hydrocarbons (PAHs) are organic molecules containing adjacent aromatic rings. Infrared emission bands show that PAHs are abundant in space, but only a few specific PAHs have been detected in the interstellar medium. An international team of researchers (USA – MIT, University of Michigan, Worcester State University, NASA Goddard Space Flight Center, Harvard Smithsonian, National Radio Astronomy Observatory, Virginia Military Institute, University of Virginia, Canada) detected 1-cyanopyrene, a cyano-substituted derivative of the related four-ring PAH pyrene, in radio observations of the dense cloud TMC-1. They estimated that pyrene contains up to 0.1% of the […]
Novel titanium dioxide catalyst shows promise for electrocatalytic carbon dioxide reduction
Phys.org September 5, 2023 CO2 can be selectively reduced by gold, lead, etc. supported on conductive carbon. However, the high pH in the vicinity of the electrode raises concerns about the catalyst and catalyst support degradation. Researchers in Japan used chemically stable titanium dioxide (TiO2) powder as an alternative to carbon. TiO2 maintained its particle shape and crystalline structure after in-liquid plasma treatment was used to improve its electrochemical properties. When its electrochemical properties were evaluated, they observed the disappearance of Ti4+ and Ti3+ redox peaks derived from TiO2 and a decrease in hydrogen overvoltage. The hydrogen overvoltage relationship suggested […]
Diazotrophs are overlooked contributors to carbon and nitrogen export to the deep ocean
Phys.org October 17, 2022 Diazotrophs are widespread microorganisms that alleviate nitrogen limitation in 60% of our oceans, thereby regulating marine productivity. Yet, the group-specific contribution of diazotrophs to organic matter export has not been quantified. An international team of researchers (France, Israel, Spain) examined the fate of five groups of globally distributed diazotrophs by using an original combination of mesopelagic particle sampling devices across the subtropical South Pacific Ocean. They demonstrated that cyanobacterial and non-cyanobacterial diazotrophs are exported down to 1000 m depth. Phycoerythrin-containing UCYN-B and UCYN-C-like cells were recurrently found embedded in large organic aggregates or organized into clusters of […]
Safer carbon capture and storage
Science Daily December 29, 2021 From the gene-sequencing analyses of the behaviour of CO2 within a CO2-Eenhanced Oil Recovery (EOR) flooded oil field an international team of researchers (UK, USA – Woods hole Oceanographic Institution, industry, France, Canada) has shown that up to 74% of CO2 left behind by CO2-EOR was dissolved in the groundwater. It also revealed, that microbial methanogenesis converted as much as 13-19% of the injected CO2 to methane, which is a stronger greenhouse gas than CO2. The authors suggest that this process is occurring at other CO2-rich natural gas fields and CO2-EOR oil fields. Temperature is […]