Current Search: Carbon dioxide (x)
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- Title
- Life suppot materials in a manned submersible.
- Creator
- Wang, Tsen C.
- Date Issued
- 1982-02
- PURL
- http://purl.flvc.org/fcla/dt/3358776
- Subject Headings
- Submersibles, Carbon dioxide mitigation
- Format
- Document (PDF)
- Title
- DEVELOPING AMINE-MODIFIED SILICA MATERIALS FOR CARBON DIOXIDE CAPTURE FROM DIFFERENT GAS STREAMS.
- Creator
- Ahmadian, Amirjavad Hosseini, Lashaki, Masoud Jahandar, Florida Atlantic University, Department of Civil, Environmental and Geomatics Engineering, College of Engineering and Computer Science
- Abstract/Description
-
The atmospheric concentration of CO2 increased from 320 to 425 parts per million by volume (ppmv; 0.0425 vol.%) between 1960 and 2024. Sample CO2 reduction strategies include shifting to renewable energy sources and employing CO2 capture. CO2 capture from the air (also known as direct air capture; DAC) has recently received increased attention. CO2 has the potential to act as an asphyxiant at high concentrations, particularly in enclosed environments (e.g., spacecraft, submarines), requiring...
Show moreThe atmospheric concentration of CO2 increased from 320 to 425 parts per million by volume (ppmv; 0.0425 vol.%) between 1960 and 2024. Sample CO2 reduction strategies include shifting to renewable energy sources and employing CO2 capture. CO2 capture from the air (also known as direct air capture; DAC) has recently received increased attention. CO2 has the potential to act as an asphyxiant at high concentrations, particularly in enclosed environments (e.g., spacecraft, submarines), requiring air revitalization to remove CO2. Hence, the U.S. Occupational Safety and Health Administration determined a permissible exposure limit of 5,000 ppmv CO2 (0.5 vol.%) throughout an 8-hour work shift. Considering the trace levels of CO2 and the presence of humidity in DAC and air revitalization applications, similar materials can be developed for implementation in both cases. CO2 capture involving amine-functionalized silica materials (“aminosilicas”) can achieve high CO2 uptakes at low concentrations due to high selectivity. Additionally, moisture in CO2-laden gases enhances the CO2 uptake and stability of aminosilicas. Therefore, this research investigated the potential of aminosilicas for removing CO2 from dilute streams, including DAC and air revitalization applications. Aminosilicas were produced using mesoporous silica supports with different particle sizes that were modified with tetraethylenepentamine (TEPA) or branched polyethylenimine (PEI) with different molecular weights (600, 1200, and 1800), or grafted with 3-aminopropyltrimethoxysilane (APTMS). The performance of aminosilicas was assessed to determine equilibrium CO2 adsorption capacity, adsorption kinetics, and cyclic stability.
Show less - Date Issued
- 2024
- PURL
- http://purl.flvc.org/fau/fd/FA00014479
- Subject Headings
- Carbon dioxide mitigation, Adsorption
- Format
- Document (PDF)
- Title
- Preliminary study on carbondioxide, temperature and humidity profiles in a manned submersible.
- Creator
- Wang, Tsen C., Lenahan, Robert A., Harbor Branch Oceanographic Institute
- Date Issued
- 1982
- PURL
- http://purl.flvc.org/fau/fd/FA00007001
- Subject Headings
- Carbon dioxide, Submersibles, Temperature, Humidity
- Format
- Document (PDF)
- Title
- MICROFLUIDICS FOR CARBON CAPTURE AND SEQUESTRATION.
- Creator
- Seo, Seokju, Kim, Myeongsub (Mike), Florida Atlantic University, Department of Ocean and Mechanical Engineering, College of Engineering and Computer Science
- Abstract/Description
-
Carbon capture and sequestration (CCS) has been considered a promising technology for mitigating heavy atmospheric carbon dioxide (CO2) concentration as an immediate response to global climate change and ocean acidification. Despite various previous studies on CCS, there has been a paucity of research to overcome many of the challenges. In geological carbon sequestration, there are two major issues in achieving a feasible means of storing CO2. The first is the slow reaction of carbonic acid ...
Show moreCarbon capture and sequestration (CCS) has been considered a promising technology for mitigating heavy atmospheric carbon dioxide (CO2) concentration as an immediate response to global climate change and ocean acidification. Despite various previous studies on CCS, there has been a paucity of research to overcome many of the challenges. In geological carbon sequestration, there are two major issues in achieving a feasible means of storing CO2. The first is the slow reaction of carbonic acid (H2CO3) formation from the reaction between injected CO2 and brine. Another technical challenge to the realization of industrial-scale carbon sequestration is the drying-out of brine induced by CO2 advection. The resident brine near a wellbore area is rapidly evaporated while precipitating significant amounts of salt at pores when gaseous CO2 is continuously injected into these aquifers. On the other hand, in industrial post-carbon capture processes, monoethanolamine (MEA) has been dominantly used as an absorption solvent. However, it generates significant amounts of toxic wastewater containing chemicals difficult to treat. The objectives of this thesis are to address these challenges in CCS, making the CCS technology feasible and competitive. An innovative method for geologic carbon sequestration, namely nickel nanoparticles (Ni NPs) addition to the injection fluid was developed and evaluated, to address issues of the slow reaction in deep saline aquifers. The catalytic activity of Ni NPs was evaluated using the microfluidic technique to confirm their possibility of additive for enhancing CO2 hydration in deep saline aquifers. First of all, to achieve acceleration of CO2 dissolution under reservoir-specific conditions, the catalytic effect of Ni NPs was investigated by monitoring change in CO2 bubble size at various Ni NPs concentration, pH, and different levels of salinity. Then, steric stabilization of Ni NPs by adsorbing polymers has been studied to further enhance Ni NPs’ catalytic activity. Second, to overcome the brine drying-out challenge, a new strategy of sequential water injection with CO2 was proposed. This sequential injection strategy showed great potential for preventing aquifer formation damage by decreasing brine drying-out and enhancing CO2 dissolution significantly. Lastly, the CO2 capturing performance of Ni NPs as a possible additive in an MEA solvent was evaluated to meet CO2 reduction and environmental protection demands. The results were promising: the catalytic potential of Ni NPs accelerates the average CO2 absorption rate by 34% and 54% in the limited mixing and the high mixing conditions, respectively. The results presented in this dissertation could help alleviate global concerns raised by CCS technology and would offer strategies for stable CCS technology with improved efficiency.
Show less - Date Issued
- 2019
- PURL
- http://purl.flvc.org/fau/fd/FA00013412
- Subject Headings
- Carbon dioxide capture, Carbon dioxide mitigation, Microfluidics, Carbon capture and storage, Carbon sequestration
- Format
- Document (PDF)
- Title
- Significance of carbon dioxide and bicarbonate-carbon uptake in marine biomass production.
- Creator
- Ryther, John H., DeBusk, T. A., Harbor Branch Oceanographic Institute
- Date Issued
- 1982
- PURL
- http://purl.flvc.org/fau/fd/FA00007054
- Subject Headings
- Biomass, Carbon dioxide, Bicarbonate, Gracilaria, Red algae
- Format
- Document (PDF)
- Title
- Gasometric device for measuring CO2 scrubber performance efficiency.
- Creator
- Wang, Tsen C., Lenahan, Robert A., Harbor Branch Oceanographic Institute
- Date Issued
- 1986
- PURL
- http://purl.flvc.org/fau/fd/FA00007491
- Subject Headings
- Submersibles, Scrubber (Chemical technology), Carbon dioxide
- Format
- Document (PDF)
- Title
- Carbon Dioxide scrubbing materials in life support equipment.
- Creator
- Wang, Tsen C., Harbor Branch Oceanographic Institute
- Date Issued
- 1982
- PURL
- http://purl.flvc.org/fau/fd/FA00007000
- Subject Headings
- Carbon dioxide, Life Support Systems, Carbon dioxide--Absorption and adsorption
- Format
- Document (PDF)
- Title
- Total carbon system automation.
- Creator
- Clark, A. M.
- Date Issued
- 1979 - 09 - 06
- PURL
- http://purl.flvc.org/fcla/dt/3358736
- Subject Headings
- Carbon, Carbon--Measurement, Seawater--Analysis, Indian River (Fla. : Lagoon), Carbon dioxide--Measurement
- Format
- Document (PDF)
- Title
- Decompression cycling effects on the shelf life of lithium hydroxide.
- Creator
- Wang, Tsen C., Harbor Branch Oceanographic Institute
- Date Issued
- 1975
- PURL
- http://purl.flvc.org/FCLA/DT/3338492
- Subject Headings
- Lithium hydroxide, Carbon dioxide--Absorption and adsorption, Submersibles, Decompression
- Format
- Document (PDF)
- Title
- Temperature effects on baralyme, sodasorb, and lithium hydroxide.
- Creator
- Wang, Tsen C., Harbor Branch Oceanographic Institute
- Date Issued
- 1975
- PURL
- http://purl.flvc.org/FCLA/DT/3318942
- Subject Headings
- Carbon dioxide removal, Alkali metal hydroxides, Lithium hydroxide, Alkali metals
- Format
- Document (PDF)
- Title
- Effects of Carbon Dioxide Levels on Growth and Pigments of Freshwater Algae.
- Creator
- Bermudez, Jeanne, Louda, J. W., Florida Atlantic University, Charles E. Schmidt College of Science, Department of Chemistry and Biochemistry
- Abstract/Description
-
This project was designed to investigate the effects of carbon dioxide (CO2) levels on the growth and pigment ratios (chemotaxonomy) of freshwater algal species typical to the south Florida surface waters. Green algae, diatoms, and cyanobacteria were cultured under 400 or 800 ppm CO3 in air for several weeks. Growth monitoring used a cell counter, hemocytometer, and chlorophyll fluorescence. Pigments were analyzed using HPLC-PDA. Experiments with certified CO2 concentrations (400, 600, 800,...
Show moreThis project was designed to investigate the effects of carbon dioxide (CO2) levels on the growth and pigment ratios (chemotaxonomy) of freshwater algal species typical to the south Florida surface waters. Green algae, diatoms, and cyanobacteria were cultured under 400 or 800 ppm CO3 in air for several weeks. Growth monitoring used a cell counter, hemocytometer, and chlorophyll fluorescence. Pigments were analyzed using HPLC-PDA. Experiments with certified CO2 concentrations (400, 600, 800, 1200 ppm) were conducted with helium degassed ultrapure water and each of three culture media. Theoretical and experimental pH values with water matched exactly. However, each culture media proved to exhibit significant buffer capacity. Cell growth monitoring was problematic except for the cyanobacterium Microcystis aeruginosa. That species responded to increased CO2 (800 ppm) with increased growth rates as predicted. The other species gave erratic results mainly due to difficulties in obtaining valid consistent cell counts.
Show less - Date Issued
- 2018
- PURL
- http://purl.flvc.org/fau/fd/FA00013170
- Subject Headings
- Freshwater algae--Growth, Chemotaxonomy, Carbon dioxide, Pigments (Biology)
- Format
- Document (PDF)
- Title
- DEVELOPING NOVEL ADSORBENT MATERIALS FOR CARBON DIOXIDE REMOVAL FROM ENCLOSED ENVIRONMENTS.
- Creator
- Ahsan, Sara, Masoud Jahandar Lashaki, Florida Atlantic University, Department of Civil, Environmental and Geomatics Engineering, College of Engineering and Computer Science
- Abstract/Description
-
Exposure to high CO2 levels in enclosed environments may result in adverse health impacts. To provide a safe breathing environment, the exhaled gases must be removed. Currently, NASA uses a multi-bed system known as the Carbon Dioxide Removal Assembly (CDRA) for CO2 removal. The process involves cyclic adsorption-desorption using zeolite-5A molecular sieves. Owing to the presence of a wet gaseous mixture and the hydrophilic nature of zeolite-5A, the removal of CO2 and water vapor must be...
Show moreExposure to high CO2 levels in enclosed environments may result in adverse health impacts. To provide a safe breathing environment, the exhaled gases must be removed. Currently, NASA uses a multi-bed system known as the Carbon Dioxide Removal Assembly (CDRA) for CO2 removal. The process involves cyclic adsorption-desorption using zeolite-5A molecular sieves. Owing to the presence of a wet gaseous mixture and the hydrophilic nature of zeolite-5A, the removal of CO2 and water vapor must be conducted in two separate vessels, resulting in additional costs. Therefore, the objective of this study was to integrate and intensify the process utilizing amine-grafted silica. Adsorbent performance was gauged on equilibrium CO2 uptake and kinetics, activation temperature, CO2 desorption temperature, and consecutive cycling in the presence of 1 vol.% CO2 in N2 at 25 °C. Aminosilica outperformed 5A and achieved similar equilibrium CO2 uptake while exhibiting faster kinetics, and lower desorption and regeneration temperature requirements.
Show less - Date Issued
- 2021
- PURL
- http://purl.flvc.org/fau/fd/FA00013844
- Subject Headings
- Carbon dioxide, Adsorption, Air--Purification, Silica, Zeolites
- Format
- Document (PDF)
- Title
- An automated system of sample analysis for a total carbon analyser.
- Creator
- Fitzgerald, L., Montgomery, John R., Holt, John K., Harbor Branch Oceanographic Institute
- Date Issued
- 1984
- PURL
- http://purl.flvc.org/FCLA/DT/3351926
- Subject Headings
- Carbon, Seawater--Analysis, Seawater--Analysis--Automation, Seawater--Carbon dioxide content
- Format
- Document (PDF)
- Title
- LiOH absorber model testing in underwater life support systems.
- Creator
- Wang, Tsen C., Liou, M. C., Hendry, C., Harbor Branch Oceanographic Institute
- Date Issued
- 1988
- PURL
- http://purl.flvc.org/fau/fd/FA00007496
- Subject Headings
- Lithium hydroxide, Axial flow, Scrubber (Chemical technology), Carbon dioxide, Ocean engineering, Life Support Systems
- Format
- Document (PDF)
- Title
- Computer program for lithium hydroxide - carbon dioxide absorption in underwater life support systems.
- Creator
- Wang, Tsen C., Liou, M. C., Hendry, C., Harbor Branch Oceanographic Institute
- Date Issued
- 1989
- PURL
- http://purl.flvc.org/fau/fd/FA00007497
- Subject Headings
- Lithium hydroxide, Carbon dioxide--Absorption and adsorption, Life Support Systems, Ocean engineering
- Format
- Document (PDF)
- Title
- Modeling of axial flow canisters for carbon dioxide-lithium hydroxide absorption in underwater life support systems.
- Creator
- Liou, M. C., Wang, Tsen C., Harbor Branch Oceanographic Institute
- Date Issued
- 1987
- PURL
- http://purl.flvc.org/fau/fd/FA00007494
- Subject Headings
- Life Support Systems, Carbon dioxide--Absorption and adsorption, Lithium hydroxide, Axial flow, Ocean engineering
- Format
- Document (PDF)
- Title
- Combined temperature and water vapor effects on the lithium hydroxide-carbon dioxide reaction in underwater life support systems.
- Creator
- Wang, Tsen C., Bricker, J. L., Harbor Branch Oceanographic Institute
- Date Issued
- 1979
- PURL
- http://purl.flvc.org/FCLA/DT/3353725
- Subject Headings
- Carbon dioxide, Lithium hydroxide, Life Support Systems, Temperature, Water vapor, Humidity
- Format
- Document (PDF)
- Title
- Carbon dioxide capture by engineering a self-sustained coral reef park with renewable energy.
- Creator
- Quiray, Paulane C., Raja, Umar, Athey, David, Savage, Tabatha, Suzuki, Hiroko, Egeland, Matthew, Su, Tsung-Chow
- Date Issued
- 2012-04-06
- PURL
- http://purl.flvc.org/fcla/dt/3349042
- Subject Headings
- Carbon Dioxide, Renewable Energy, Self-sustained coral reef park, Bio-diversity
- Format
- Document (PDF)
- Title
- Investigation of carbon dioxide transport in life support helmets.
- Creator
- Camperman, John Michael., Florida Atlantic University, Tennant, Jeffrey S., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
- Abstract/Description
-
This research explores carbon dioxide transport in life support helmet annular space using new theoretical and experimental techniques. Increased transport from next generation helmets is necessary to allow reduction of fresh gas flow and associated noise. Conventional helmet noise interferes with communications and some underwater helmets even approach hearing threshold shift levels. Helmet flow is three dimensional, unsteady, and turbulent; this research is the first known effort to...
Show moreThis research explores carbon dioxide transport in life support helmet annular space using new theoretical and experimental techniques. Increased transport from next generation helmets is necessary to allow reduction of fresh gas flow and associated noise. Conventional helmet noise interferes with communications and some underwater helmets even approach hearing threshold shift levels. Helmet flow is three dimensional, unsteady, and turbulent; this research is the first known effort to identify the fundamental mechanisms of CO2 transport. An analytical model is developed which predicts average inhaled CO2 concentration for generic helmet geometry using a mixing volume approach. The model includes sensitivity to supply flow, breath rate, metabolic CO2 production, inhalation and exhalation mixing volumes, and breathing symmetry. Numerical sensitivity analysis using the model indicates optimum design paths. Nominal head-helmet-lung geometry is identified. An experimental nominal model was developed which supports inhaled concentration measurements with air-CO2 or water-dye as working fluids. Water modeling provides flow visualization which is used to identify complex convective and turbulent CO2 transport mechanisms. Correlation of water-dye and air-CO2 results indicates conditions when molecular diffusion of CO2 is significant. The research was directed primarily toward diving helmets but is applicable to spacesuit and firefighter helmets, as well as any situation involving mass transport in a periodic mixing chamber. New analytical and experimental models are substantially more accurate than the conventional steady state helmet mixing model, and provide direction for improved helmet design.
Show less - Date Issued
- 1995
- PURL
- http://purl.flvc.org/fcla/dt/12432
- Subject Headings
- Deep diving--Equipment and supplies, Deep diving--Physiological aspects, Carbon dioxide, Underwater physiology
- Format
- Document (PDF)
- Title
- CO2 absorption capacity of new and old lithium hydroxide used in underwater life support systems.
- Creator
- Wang, Tsen C., Krivan, J. P., Jr., Harbor Branch Oceanographic Institute
- Date Issued
- 1997
- PURL
- http://purl.flvc.org/fau/fd/FA00007131
- Subject Headings
- Carbon dioxide--Absorption and adsorption, Lithium hydroxide, Life Support Systems
- Format
- Document (PDF)