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Enhanced Wastewater Reclamation with Carbonaceous Membranes
Enhanced Wastewater Reclamation with Carbonaceous Membranes
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105605
- ISBN
- 9798265403926
- DDC
- 574
- 저자명
- White, Haley D.
- 서명/저자
- Enhanced Wastewater Reclamation with Carbonaceous Membranes
- 발행사항
- [Sl] : Georgia Institute of Technology, 2022
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2022
- 형태사항
- 267 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Lively, Ryan P.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2022.
- 초록/해제
- 요약1The removal of organic contaminants from wastewater and drinking water streams is becoming increasingly important to safeguard global water resources and public health. The separation of such organic contaminants, often referred to as emerging contaminants of concern (CoCs), is difficult because many of these constituents are small and neutral solutes. Many traditional treatment technologies rely on the size and/or charge of the contaminant for removal, and so these contaminants are considered to be recalcitrant with traditional drinking water or wastewater treatment processes. Carbonaceous membrane and adsorbent materials, however, show promise for the removal of emerging contaminants due to their chemical, mechanical, and thermal stability, their scaling ability, the potential to use inexpensive precursors, and the capability to avoid multi-step fabrication techniques.The ability for rigid and carbonaceous membranes to separate organic contaminants from aqueous waste streams can be predicted using thermodynamics, kinetics, and transition state theory fundamentals. With transition state theory, we can better understand the effects of the degrees of freedom (ability for a molecule to move in the translational, vibrational, or rotational directions based on the canonical partition function) on a molecule as it diffuses through rigid nanoporous and microporous regions in a membrane. Understanding the degrees of freedom of a molecule in a membrane allows us to see the potential effects of entropic selectivity on overall diffusivity selectivity. Using a simple model that was developed from transition state theory, the diffusivity selectivity of water compared with various potential organic contaminants is estimated. From these data, we learn that the enthalpy of sorption, activation energy of diffusion, and minimum potential energy between the guest species and host membrane material heavily contribute to diffusivity selectivity in rigid membranes. Additionally, isotherm behavior plays a key role in diffusivity selectivity at all fractional occupancies (partial pressures). We also learn that rigid membrane materials exhibit diffusivity selectivities that exceed the upper bound for aqueous separations when separating water from certain organic contaminants. The upper bound for aqueous membrane separations is currently identified with NaCl rejection using thin film composite reverse osmosis membranes that contain an active polyamide layer. These preliminary estimations encourage further experimental work with rigid adsorbent and membrane materials for organic-laden aqueous streams.Thin film composite reverse osmosis membranes that incorporate a layer of fully aromatic polyamide are highly selective toward NaCl (99% rejection) in seawater desalination. The high selectivity of fully aromatic polyamide as a flexible polymer inspired further work into development of carbon molecular sieves (CMS) derived from this precursor for enhanced removal of small and neutral solutes. CMS were fabricated by pyrolyzing polyamide latexes in temperatures of 700 °C to 900 °C in inert, oxidizing, or reducing atmospheres. These materials were characterized with many techniques to probe the structural and chemical properties, as well as estimate potential separation performance. Nitrogen physisorption reveals a bimodal pore structure in these materials with ultramicropores of 5.5 A to 6.5 A in diameter and micropores ~ 1 nm in diameter. Dynamic vapor sorption measurements completed with water and n, n- dimethylformamide allow for estimations of high diffusivity, sorption, and permeability selectivities of these CMS materials.
- 일반주제명
- Membranes
- 일반주제명
- Software packages
- 일반주제명
- Gases
- 일반주제명
- Permeability
- 일반주제명
- Reverse osmosis
- 일반주제명
- Carbon dioxide
- 일반주제명
- Adsorption
- 일반주제명
- Desalination
- 일반주제명
- Drinking water
- 일반주제명
- Chemical bonds
- 일반주제명
- Energy
- 일반주제명
- Pore size
- 일반주제명
- Thin films
- 일반주제명
- Hydraulics
- 일반주제명
- Organic contaminants
- 일반주제명
- Ethanol
- 일반주제명
- Nitrogen
- 일반주제명
- Analytical chemistry
- 일반주제명
- Condensed matter physics
- 일반주제명
- Materials science
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
■007cr#unu||||||||
■020 ▼a9798265403926
■035 ▼a(MiAaPQ)AAI32316100
■035 ▼a(MiAaPQ)GeorgiaTech72621
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574
■1001 ▼aWhite, Haley D.
■24510▼aEnhanced Wastewater Reclamation with Carbonaceous Membranes
■260 ▼a[Sl]▼bGeorgia Institute of Technology▼c2022
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2022
■300 ▼a267 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Lively, Ryan P.
■5021 ▼aThesis (Ph.D.)--Georgia Institute of Technology, 2022.
■520 ▼a1The removal of organic contaminants from wastewater and drinking water streams is becoming increasingly important to safeguard global water resources and public health. The separation of such organic contaminants, often referred to as emerging contaminants of concern (CoCs), is difficult because many of these constituents are small and neutral solutes. Many traditional treatment technologies rely on the size and/or charge of the contaminant for removal, and so these contaminants are considered to be recalcitrant with traditional drinking water or wastewater treatment processes. Carbonaceous membrane and adsorbent materials, however, show promise for the removal of emerging contaminants due to their chemical, mechanical, and thermal stability, their scaling ability, the potential to use inexpensive precursors, and the capability to avoid multi-step fabrication techniques.The ability for rigid and carbonaceous membranes to separate organic contaminants from aqueous waste streams can be predicted using thermodynamics, kinetics, and transition state theory fundamentals. With transition state theory, we can better understand the effects of the degrees of freedom (ability for a molecule to move in the translational, vibrational, or rotational directions based on the canonical partition function) on a molecule as it diffuses through rigid nanoporous and microporous regions in a membrane. Understanding the degrees of freedom of a molecule in a membrane allows us to see the potential effects of entropic selectivity on overall diffusivity selectivity. Using a simple model that was developed from transition state theory, the diffusivity selectivity of water compared with various potential organic contaminants is estimated. From these data, we learn that the enthalpy of sorption, activation energy of diffusion, and minimum potential energy between the guest species and host membrane material heavily contribute to diffusivity selectivity in rigid membranes. Additionally, isotherm behavior plays a key role in diffusivity selectivity at all fractional occupancies (partial pressures). We also learn that rigid membrane materials exhibit diffusivity selectivities that exceed the upper bound for aqueous separations when separating water from certain organic contaminants. The upper bound for aqueous membrane separations is currently identified with NaCl rejection using thin film composite reverse osmosis membranes that contain an active polyamide layer. These preliminary estimations encourage further experimental work with rigid adsorbent and membrane materials for organic-laden aqueous streams.Thin film composite reverse osmosis membranes that incorporate a layer of fully aromatic polyamide are highly selective toward NaCl (99% rejection) in seawater desalination. The high selectivity of fully aromatic polyamide as a flexible polymer inspired further work into development of carbon molecular sieves (CMS) derived from this precursor for enhanced removal of small and neutral solutes. CMS were fabricated by pyrolyzing polyamide latexes in temperatures of 700 °C to 900 °C in inert, oxidizing, or reducing atmospheres. These materials were characterized with many techniques to probe the structural and chemical properties, as well as estimate potential separation performance. Nitrogen physisorption reveals a bimodal pore structure in these materials with ultramicropores of 5.5 A to 6.5 A in diameter and micropores ~ 1 nm in diameter. Dynamic vapor sorption measurements completed with water and n, n- dimethylformamide allow for estimations of high diffusivity, sorption, and permeability selectivities of these CMS materials.
■590 ▼aSchool code: 0078.
■650 4▼aMembranes
■650 4▼aSoftware packages
■650 4▼aGases
■650 4▼aPermeability
■650 4▼aReverse osmosis
■650 4▼aCarbon dioxide
■650 4▼aAdsorption
■650 4▼aDesalination
■650 4▼aDrinking water
■650 4▼aChemical bonds
■650 4▼aEnergy
■650 4▼aPore size
■650 4▼aThin films
■650 4▼aHydraulics
■650 4▼aOrganic contaminants
■650 4▼aEthanol
■650 4▼aScanning electron microscopy
■650 4▼aNitrogen
■650 4▼aAnalytical chemistry
■650 4▼aCondensed matter physics
■650 4▼aMaterials science
■650 4▼aWater resources management
■690 ▼a0791
■690 ▼a0486
■690 ▼a0611
■690 ▼a0794
■690 ▼a0595
■71020▼aGeorgia Institute of Technology.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0078
■791 ▼aPh.D.
■792 ▼a2022
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360681▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


