Dealumination and monoethanolamine impregnation of zeolite mining waste applied to carbon dioxide adsorptive capture

2025 · doi:10.22541/au.174951725.53089027/v1
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This preprint studied how dealumination of zeolite mining waste and subsequent monoethanolamine (MEA) wet impregnation affect the material’s structure and CO₂ adsorption performance. Using aluminium removal levels that changed Si/Al ratios (40.4%–86.5% Al removal), along with confirmation of MEA impregnation by FTIR and TG and an orthogonal L16 experimental design varying H₂SO₄ concentration, reaction time, and MEA loading, the authors report that 1% MEA loading yields the highest CO₂ uptake across Si/Al ratios and that higher loadings reduce uptake due to steric hindrance. FTIR indicated MEA remains on the zeolite surface and suggested adsorption/desorption below 99 °C to avoid degradation, with dealumination intensity shifting micropore creation vs pore accessibility. The paper is explicitly stated to be a preprint with preliminary (not peer-reviewed) data. The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

The modification of zeolite mining waste (ZMW) to develop a solid adsorbent for carbon dioxide (CO₂) capture presents significant potential for low-pressure CO₂ immobilization with a reduced carbon footprint, offering a sustainable alternative to conventional adsorbents such as metal-organic frameworks (MOFs). The dealumination process applied to ZMW produces materials with distinct mineral frameworks, significantly altering micropore concentration and surface morphology. Aluminium removal varies from 40.4% to 86.5%, corresponding to Si/Al ratios from 8.2 to 36.2. Lower dealumination conditions existing pores, while strong dealumination creates new pores and reduces external surface area. Intermediate aluminium removal results in surface polishing, low micropore area, and high external surface area. Monoethanolamine (MEA) impregnation is carried out using the wet impregnation method and confirmed by Fourier transform infrared spectroscopy (FTIR) and thermogravimetry (TG). The L16(3⁴) orthogonal experimental design identifies the optimal region for CO₂ uptake in relation to H₂SO₄ concentration, reaction time, and MEA loading. A 1% MEA loading provides the highest CO₂ uptake regardless of Si/Al ratio, indicating steric hindrance at higher loadings. FTIR confirms MEA on the zeolite surface and suggests adsorption and desorption below 99 °C to avoid degradation. These results support ZMW as a low-cost, low-carbon adsorbent for CO₂ capture.
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Abstract

The modification of zeolite mining waste (ZMW) to develop a solid adsorbent for carbon dioxide (CO₂) capture presents significant potential for low-pressure CO₂ immobilization with a reduced carbon footprint, offering a sustainable alternative to conventional adsorbents such as metal-organic frameworks (MOFs). The dealumination process applied to ZMW produces materials with distinct mineral frameworks, significantly altering micropore concentration and surface morphology. Aluminium removal varies from 40.4% to 86.5%, corresponding to Si/Al ratios from 8.2 to 36.2. Lower dealumination conditions existing pores, while strong dealumination creates new pores and reduces external surface area. Intermediate aluminium removal results in surface polishing, low micropore area, and high external surface area. Monoethanolamine (MEA) impregnation is carried out using the wet impregnation method and confirmed by Fourier transform infrared spectroscopy (FTIR) and thermogravimetry (TG). The L16(3⁴) orthogonal experimental design identifies the optimal region for CO₂ uptake in relation to H₂SO₄ concentration, reaction time, and MEA loading. A 1% MEA loading provides the highest CO₂ uptake regardless of Si/Al ratio, indicating steric hindrance at higher loadings. FTIR confirms MEA on the zeolite surface and suggests adsorption and desorption below 99 °C to avoid degradation. These results support ZMW as a low-cost, low-carbon adsorbent for CO₂ capture. Supplementary Material File (dealumination and monoethanolamine impregnation of zeolite mining waste applied to carbon dioxide adsorptive capture.docx) - Download - 2.51 MB Information & Authors Information Version history Copyright This work is licensed under a Non Exclusive No Reuse License.

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Authors Metrics & Citations Metrics Article Usage 216views 95downloads Citations Download citation Matheus Duarte, Mariam Darestani, Dia Milani, et al. Dealumination and monoethanolamine impregnation of zeolite mining waste applied to carbon dioxide adsorptive capture. Authorea. 10 June 2025. DOI: https://doi.org/10.22541/au.174951725.53089027/v1 DOI: https://doi.org/10.22541/au.174951725.53089027/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu.

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