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Apr 21 8 tweets 5 min read Twitter logo Read on Twitter
"A promising solution to nullify the net embodied #GHG emissions of civil infrastructure is the use of C-negative materials for concrete manufacturing. C-neutral coal ash & agriculture/forestry by-products, like #biochar, exhibit a high CO2 uptake potential."
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📝 A lately published paper aimed "to explore the viability of using #biochar as a #CarbonSink and to develop carbon-neutral #concrete with improved performance."
📉 Experimental findings suggest that "the optimal amount of biochar (1%) slightly improves hydration and mechanical properties, but the combination with mineral additives significantly enhances the performance."
📊 Thermogravimetric analysis (TGA) revealed that "compared to OPC, the addition of 1% #biochar contributes to a 42% increase in CO2 uptake, while the combination of biochar with 10% class C fly ash further increases #CO2 #capture capacity of the mix by 92%."
"The carbonated #biochar mortars exhibit up to 64% increased toughness indices indicating the material's great resistance to crack coalescence and propagation at the strain softening stage."
Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy results "validated the prediction of study that the porous morphology of #biochar promoted enhanced CO2 #absorption & in-situ mineralization of CaCO3, resulting in a denser & stronger cement matrix."
Read the paper about the potential of biochar-enriched cementitious systems for carbon capture and storage here ⬇️…


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More from @

Apr 22

"This review provides an extensive evaluation of recent advances in multiscale models used for the theoretical physical descriptions of #DirectAirCapture."

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"Reviewed (CO2 mass) transfer works span from the ab initio density functional theory calculation relationships to mesoscale Monte Carlo, molecular dynamics simulations & micro-kinetics, adsorption/desorption, & most commonly-investigated specific macroscale concept."
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The modelled #DAC processes properties reported in the literature have been compared by the authors of this review paper, which allowed them "to identify the most effective sorbents."
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Read 8 tweets
Apr 21

"A comprehensive #bioenergy accounting model with a multi-dimensional analysis was
developed in a new study based in #China by combining spatial, life-cycle, and multi-path analyses."

Summary in a 🧵 below ⬇️
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Accordingly, "the #bioenergy production potential and #GHG emission reduction for each distinct type of #biomass feedstock through different conversion pathways were estimated in the study."
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"The sum of all available organic waste (21.55EJ/yr) & energy plants on marginal land (11.77EJ/yr) in China produced 23.30EJ of #bioenergy & reduced 2535.32Mt CO2-eq emissions, accounting for 19.48% & 25.61% of China’s T energy production & C emissions in 2020, respectively."
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Read 6 tweets
Apr 20

The newly published article focuses on the physical & chemical aspects of #CO2 #storage via liquid & solid chemical carriers & sorbents & gives an overview of the energetics around their use & options for their future development.
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Research pointed that "exciting opportunities for coupling #capture and medium to high maturity multi-year #storage technologies could support #CarbonRemoval in the coming decades."
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Highlights of the analysis are:
🔸"The remarkable #storage capacity of oxalic acid & formic acid (CO2-density of 1857 kg m−3 & 1152 kg m−3, compared with condensed liquid CO2 at 993–1096 kg m−3, respectively)."
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Read 7 tweets
Apr 19

A recent study funded by @DegreesNGO, executed by @peteirvine & others aims "to assess the impact of #SAG on Sea Surface Temperature (SST) in the Gulf of Guinea & its causes using GLENS simulations performed under high anthropogenic emission scenario (RCP8.5)."
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"Study focus on two dynamically different regions:
🔸Sassandra Upwelling in Côte d’Ivoire (SUC, located east of Cape Palmas)
🔸Takoradi Upwelling in Ghana (TUG, located east of Cape Three Points)"
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Results show that "in the SUC region, under climate change, there is an increase in SST (referred to as the current climate) all year long (by 1.52 °C on average) mainly due to an < in net heat flux (lead by the > in longwave radiation) & also in weak vertical mixing."
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Read 8 tweets
Apr 18

"The energy-intensive nature of CO2 absorption-desorption processes has restricted deployment of #DAC operations. So, catalytic solvent regeneration is a valid solution to tackle this case by accelerating CO2 desorption at lower regeneration temperatures."
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The new work reports "a one-step synthesis methodology to prepare monodispersed #carbon nanospheres (MCSs) using trisodium citrate as a structure-directing agent with acidic sites."
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"The assembly of citrate groups on the surface of MCSs enables consistent spherical growth morphology, reduces agglomeration & enhances H2O dispersibility. The functionalization-assisted synthesis produces uniform hydrophilic nanospheres of 100–600nm range."
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Read 7 tweets
Apr 18

A viable & novel formula for a #CarbonNegative, environmentally friendly #concrete that is nearly as strong as regular concrete has been developed recently at Washington State University.


*Summary* in a🧵 below:
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🧫 Researchers exemplify "a synergistic C-capture strategy, i.e., using #concrete washout water & #biochar together to achieve carbon-negative concrete."

"This strategy enabled the biochar to #capture 22.85 wt% air-borne CO2, which precipitated CaCO3 onto the biochar."
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🔬"This carbon-negative cement paste consisted of 30 wt% CO2-weathered #biochar and 70 wt% portland limestone #cement, which achieved the 7-day and 28-day compressive strengths of 22.1 MPa and 27.6 MPa, respectively," microscopic investigation revealed.
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Read 7 tweets

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