CO2-removal news

Peer-reviewed Publications

Wang et al. (2024): Amine/vermiculite composite aerogels fabricated by polyethyleneimine-induced vermiculite nanosheet gelation for efficient direct air capture

Shuai Wang, Huilian Sun, Jie Wang, Cong Chen, Lanlan Jiang, Yi Zhang, Yu Liu, Yongchen Song, Zheng Ling IN: Chemical Engineering Journal, 498, 155478, https://doi.org/10.1016/j.cej.2024.155478

In this study, a simple, cost-effective, and environmentally friendly method for fabricating amine/vermiculite composite aerogels is proposed for capturing CO2 from ambient air. Natural two-dimensional material, vermiculite nanosheets with exposed surface and intrinsic negative charge, was utilized as the the building blocks for fabricating aerogel as solid amine adsorbents, via the fast gelatin between vermiculite and amine, significantly reducing the cost of adsorbent preparation while achieving promising CO2 capture capability. The effects of amine loading, amine molecular weight, and porosity on CO2 capture capacity and amine efficiency were investigated.

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Peer-reviewed Publications

Carpanez et al. (2024): Potential for nutrients reuse, carbon sequestration, and CO2 emissions reduction in the practice of domestic and industrial wastewater recycling into agricultural soils: A review

Thais Girardi Carpanez, Jonathas Batista Gonçalves Silva, Marcelo Henrique Otenio, Míriam Cristina Santos Amaral, Victor Rezende Moreira IN: Journal of Environmental Management, 370, 122443, https://doi.org/10.1016/j.jenvman.2024.122443

This review assesses the feasibility of reusing treated wastewater for irrigation in agricultural soils as a strategy for nutrients recycling and mitigation of CO2 emissions. Through a literature review, it was examined wastewater sources enriched with carbon and nutrients, including municipal wastewater and associated sludge, vinasse, swine wastewater, as well as wastewater from the food industry and paper and pulp production. The review also explores the dynamics of organic matter within the soil, discussing the aspects related to its potential conversion to CO2 or long-term storage. 

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Peer-reviewed Publications

Berlianti et al. (2024): Evaluation of Potential Use of Multi-Level Sprayer and Electronic Controlling in Simple Wet Scrubber for CO2 Removal and Water Usage Efficiency Enhancement

 Berlianti Berlianti, Indra Agus, Rahmi Berlianti IN: Journal of Advanced Research in Applied Sciences and Engineering Technology, 51(1), https://doi.org/10.37934/araset.51.1.218228

The work evaluates whether applying a multi-level sprayer with electronic control can reduce the value of CO2. The study’s objective is to assess the potential utilisation of multi-level sprayers and electronic control in determining the efficiency of a basic wet scrubber for removing CO2 generated from burning garbage, particularly dry waste like paper, with the additional goal of minimising water usage. The system will be built in a small and simple wet scrubber with dimensions of 60 cm in height and about 40 cm in length and width. CO2 value and water usage in the wet scrubber will be measured. 

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Peer-reviewed Publications

Zhou et al. (2024): Biochar Catalysis for the Enhanced Abiotic Humification of Polyphenols: An Important Mechanism Helping Sequester Carbon

Jiangmin Zhou, Ziru Zhou, Chuanqing Yao, Yujie Zhang, Han Ren, Guining Lu, Hualin Chen IN: Agronomy, 14(9),  https://doi.org/10.3390/agronomy14091951

This study investigated the catalytic power of biochar from walnut shells at different temperatures (300 °C, 600 °C, and 900 °C) for the abiotic transformation of hydroquinone (HQ) as a representative polyphenol. All the biochar samples catalyzed HQ polymerization, resulting in the formation of humic polymers such as fulvic acids (FAs) and humic acids (HAs). The findings provide new insights into the application potential of biochar for promoting soil carbon sequestration.

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Peer-reviewed Publications

Chen et al. (2024): Thermodynamics analysis of innovative carbon-negative systems for direct reduction of iron ore via chemical looping technology

Xiangxiang Chen, Zhuang Sun, Po-Chih Kuo, Muhammad Aziz IN: Energy, 309, 133019, https://doi.org/10.1016/j.energy.2024.133019

To mitigate the significant carbon footprint of traditional ironmaking, this study evaluates four advanced direct reduced iron (DRI) systems powered primarily by biomass. These innovative systems employ chemical looping technology and CO2 capture techniques to produce carbon-negative iron. Detailed system modeling, optimization, and thermodynamic evaluations have been performed to analyze exergy flows, energy consumption composition and carbon emissions. 

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Peer-reviewed Publications

Nature – Bergagna et al. (2024): Blue carbon storage in a sub-Antarctic marine protected area

Lucía Bergagna, Gustavo Lovrich, Luciana Riccialdelli, Ricardo Sahade  IN: Scientific Reports, 14,
https://doi.org/10.1038/s41598-024-71319-0

Here the authors show that the carbon reservoirs of these MPAs can be greater than those of their Antarctic counterparts, which, together with their extension, emphasize the need to maintain their protected status. They assume low sediment deposition due to the oceanic location, as direct sedimentation rates for these areas are unavailable. Most blue carbon assessments have focused solely on OC, despite the formation of CaCO3 releases CO2, decreasing net carbon storage. The authors compared various approaches for incorporating carbonates into carbon estimations. These results underscore the importance of including IC into carbon assessments and highlights the importance of sub-Antarctic benthic ecosystems as nature-based solutions to climate change.

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Peer-reviewed Publications

Kim et al. (2024): Provincial-scale assessment of direct air capture to meet China’s climate neutrality goal under limited bioenergy supply

Hanwoong Kim, Yang Qiu, Haewon McJeon, Andres Clarens, Parisa Javadi, Can Wang, Rui Wang, Jiachen Wang, Hanying Jiang, Andy Miller IN: Environmental Research Letters, DOI 10.1088/1748-9326/ad77e7

This study uses a spatially detailed integrated energy-economy-climate model to evaluate DACCS for 31 provinces in China as the country pursues its goal of climate neutrality by 2060. The authors find that DACCS could expand China’s negative emissions capacity, particularly under sustainability-minded limits on bioenergy supply that are informed by bottom-up studies. For decision-makers and the energy-economy models guiding them, the results highlight the value of expanding beyond the current reliance on biomass for negative emissions in China.

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Peer-reviewed Publications

Poeplau et al. (2024): Towards an ecosystem capacity to stabilise organic carbon in soils

Christopher Poeplau, Rene Dechow, Neha Begill, Axel Don IN: Global Change Biology, https://doi.org/10.1111/gcb.17453

Soil organic carbon (SOC) accrual, and particularly the formation of fine fraction carbon (OCfine), has a large potential to act as sink for atmospheric CO2. For reliable estimates of this potential and efficient policy advice, the major limiting factors for OCfine accrual need to be understood. The upper boundary of the correlation between fine mineral particles (silt + clay) and OCfine is widely used to estimate the maximum mineralogical capacity of soils to store OCfine, suggesting that mineral surfaces get C saturated. Using a dataset covering the temperate zone and partly other climates on OCfine contents and a SOC turnover model, the authors provide two independent lines of evidence, that this empirical upper boundary does not indicate C saturation. 

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Peer-reviewed Publications

Xu et al. (2024): Comprehensive performance evaluation of HVAC systems integrated with direct air capture of CO2 in various climate zones

Youmin Xu, Xu Han, Xiangkun Elvis Cao IN: Building and Environment, 266, 112048, https://doi.org/10.1016/j.buildenv.2024.112048

This study presents a comprehensive performance evaluation of integrating DAC in HVAC systems, which can reduce indoor CO2 concentration and improve energy efficiency of HVAC systems. The DAC equipment is modeled in Modelica based on isotherm and thermodynamic equations, and pressure drop curves of the CO2 sorbent described in literature. The model is validated with data from the literature, and then integrated into a typical HVAC system available in Modelica Buildings library.

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Peer-reviewed Publications

Titus et al. (2024): Techno-economic analysis of geothermal combined with direct and biomass-based carbon dioxide removal for high-temperature hydrothermal systems

K.A. Titus, David Dempsey, Rebecca A.M. Peer, Rosalind Archer IN: Geothermics, 125, https://doi.org/10.1016/j.geothermics.2024.103159

Here, the authors present a techno-economic comparison of renewable electricity generation coupled with either BECCS or DACCS at high-temperature, low-gas hydrothermal systems. They use a systems model that quantifies energy, carbon and financial flows through a generic hybrid power plant.

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