Regeneration of Mono-ethanolamine Solution After Biogas Purification by Electrical Heating with Assisted Ultrasonic Wave

Kamopas, Wassana; Kiatsiriroat, Tanongkiat

doi:10.1007/s12649-018-0326-6

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…These results correspond to the ones obtained by Kamopas and Kiatsiriroat, where the authors regenerated MEA solutions for 3 cycles and obtained a consistent pH of 7.14 for the loaded solution and pH above 10 for the regenerated solution. 50 The pH values of the solutions are tabulated in Table 4 .…”

Section: Resultsmentioning

confidence: 99%

Graphene Oxide Enhanced Monoethanolamine and Ethylenediamine Nanofluids for Efficient Carbon Dioxide Uptake from Flue Gas

Khumalo,

Mahlangu,

Mamba

et al. 2024

ACS Omega

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The addition of nanoparticles in amine solutions to produce a stable amine-based nanofluid provides a high surface area for absorption and improves the absorption rate. In this work, nanofluids were prepared by dispersing graphene oxide (GO) in monoethanolamine (MEA) and ethylenediamine (EDA) solutions for adsorption of carbon dioxide (CO 2 ) to further improve their absorption performance by providing more reaction sites on the GO framework. GO was synthesized using the modified Hummers method and characterized for physicochemical properties using SEM, EDS, FTIR, Raman analysis, and TGA. The FTIR spectra for the GO nanoparticles before absorption showed peaks attributed to C−C, H−C, and C−O bonding. After the absorption experiments, the FTIR spectra of GO showed peaks due to C−O−NH 2 , N−O−N, and N−H bonding. The BET analysis further confirmed the decrease in the surface area, pore volume, and pore diameter of the GO recovered from the nanofluids after the CO 2 experiment, indicating an interaction between GO and amine molecules. The absorption process of CO 2 by the nanofluid was performed in a custom-made pressure chamber whereby the CO 2 gas was in direct contact with the absorption fluids. The obtained adsorption rate constant (k) for the reaction between CO 2 and 30% MEA and EDA solutions was 0.113 and 0.131, respectively. Upon addition of 0.2 mg/mL GO in the base solution, k increased to 0.16854 and 0.17603 for the MEA and EDA nanofluids, respectively. The proposed mechanism involves GO nanoparticles interacting with the amine groups through the oxygen-rich groups of GO. This results in the formation of a zwitterion that readily reacts with CO 2 , resulting in a carbamate.

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Section: Resultsmentioning

confidence: 99%

Graphene Oxide Enhanced Monoethanolamine and Ethylenediamine Nanofluids for Efficient Carbon Dioxide Uptake from Flue Gas

Khumalo,

Mahlangu,

Mamba

et al. 2024

ACS Omega

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“…These nutrients are especially valuable in organic farming to replenish harvest removal of nutrients, or in regions such as the global south where nutrient de ciency is a major factor limiting soil productivity 22 . Estimated biogas generation amounted to 29.8-127.9 billion m 3 , equivalent to 656-2815 billion MJ energy 23 . Additionally, estimated novel feeds production ranged from 36.3 to 155.6 Mt (Table 1), depending on recovery scenarios and treatment schemes.…”

Section: Global-scale Assessmentmentioning

confidence: 99%

Reducing food’s resource and climate footprints via food waste upcycling

Dou

Wang

Ying

et al. 2022

Preprint

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The global food system is a major driver of most-pressing sustainability challenges such as climate change, unsustainable resource extraction, and altered biogeochemical cycles of N and P1-5. Food loss and waste is at the heart of the problem6,7. With 1/3 of food uneaten but lost/wasted, not only do resources consumed in producing the food ‘go down the drain’ but also the wasted food continues to brew health and pollution problems8,9. Here we show that food waste recovery and upcycling can effectively mitigate food’s unintended consequences. Using global primary data, we estimated that recovering and treating food waste via composting, anaerobic digestion, or feed-making technologies could reduce carbon footprints by 614–1041 Mt CO2-eq, compared to landfill baseline, potentially offsetting global food system’s climate burden by 4.5–7.6%. Up to 6.6 Mt nutrients could be re-captured for soil-crop-based upcycling. The feed-making option could generate up to 155.6 Mt novel feeds for animal-based upcycling, potentially replacing 41% and 9% of maize and soy in global livestock feeding. Feed grain replacement can bring an array of cascading benefits such as land and fertilizer spared and pollutions avoided, which are evaluated for the U.S. and China as case-study countries.

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