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Synthesis and Application of Graphene Oxide Based Lamellar Membranes for Water Purification

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Abstract
Sufficient efforts have been carried out to fabricate highly efficient graphene oxide (GO) lamellar membranes for heavy metal ion separation and desalination of water. However, selectivity for small ions remains a major problem. Herein, GO-based bio-inspired membranes are fabricated by green method and used for selective separation of heavy metal ions and water desalination. The GO is modified with Onion extractive (OE) and fabricated into GO/OE composite membranes. The GO/OE composite membrane (350 nm) shows an excellent rejection efficiency for several heavy metal ions such as Cr6+ (~87.5%), As3+ (~89.5%), Cd2+ (~93.0%), Pb2+ (~99.5%), and good water permeance ∼460±20 Lm-2h-1 bar-1. In addition, GO/Quercetin (GO/Q) membrane is also fabricated from quercetin for comparative studies. Quercetin is an active ingredient of onion extractives. The GO/Q composite membranes show good rejection up to ~78.0%, ~80.5%, ~88.0% and 95.2% for Cr6+, As3+, Cd2+, and Pb2+ respectively with DI water permeance ∼150±10 Lm-2h-1bar-1. Further, both membranes are used for water desalination by measuring rejection of small ions such as NaCl, Na2SO2, MgCl2, and MgSO4. The resulting membranes show ˃70% rejection for small ions. In addition, both membranes are used for filtration of Indus River water and GO/Q membrane shows remarkable high separation efficiency and making river water suitable for drinking purposes. Furthermore, the GO/QE composite membrane is highly stable up to ~25 days under acidic, basic, and neutral environments as compared to GO/Q composite and pristine GO-based membranes.|중금속 이온 분리 및 담수화를 위한 고효율 그래핀 산화물(GO) 라멜라 막을 제조하기 위한 충분한 노력이 수행되었습니다. 그러나 작은 이온에 대한 선택성은 여전히 주요 문제로 남아 있습니다. 여기서 GO 기반의 생체모방막은 친환경 공법으로 제작되어 중금속 이온의 선택적 분리 및 담수화에 사용된다. GO는 양파 추출물(OE)로 변형되어 GO/OE 복합 멤브레인으로 제조됩니다. GO/OE 복합 멤브레인(350nm)은 Cr6+(~87.5%), As3+(~89.5%), Cd2+(~93.0%), Pb2+(~99.5%), 우수한 투수성 ~460±20 Lm-2h-1 bar-1. 또한 비교 연구를 위해 GO/Quercetin(GO/Q) 멤브레인도 퀘르세틴으로 제조됩니다. 케르세틴은 양파 추출물의 활성 성분입니다. GO/Q 복합 멤브레인은 DI 수분 투과율이 ~150±10 Lm-2h-1bar-1인 Cr6+, As3+, Cd2+ 및 Pb2+에 대해 각각 ~78.0%, ~80.5%, ~88.0% 및 95.2%의 우수한 거부율을 나타냅니다. . 또한 두 멤브레인 모두 NaCl, Na2SO2, MgCl2 및 MgSO4와 같은 작은 이온의 거부를 측정하여 담수화에 사용됩니다. 생성된 멤브레인은 작은 이온에 대해 70% 이하의 거부율을 나타냅니다. 또한 두 멤브레인 모두 Indus River 물의 여과에 사용되며 GO/Q 멤브레인은 현저하게 높은 분리 효율을 나타내며 강물을 식수로 적합하게 만듭니다. 또한 GO/QE 복합 멤브레인은 GO/Q 복합 및 깨끗한 GO 기반 멤브레인과 비교하여 산성, 염기성 및 중성 환경에서 최대 ~25일 동안 매우 안정적입니다.
Author(s)
Memon Fida Hussain
Issued Date
2023
Awarded Date
2023-08
Type
Dissertation
URI
https://dcoll.jejunu.ac.kr/common/orgView/000000011322
Alternative Author(s)
메몬 피다 후세인
Affiliation
Graduate School Jeju National University
Department
대학원 에너지응용시스템학부
Advisor
Choi Kyung Hyun
Table Of Contents
Abstract 1
1. Objectives of Thesis 2
2. Introduction 3
2.1 Water desalination 4
2.2 Membrane technology 5
2.3 Classifying of Membrane 7
2.4 Nanofiltration (nf) membrane 8
2.5 Graphene Based-Membrane 9
2.6 Manufacture in synthesis technique of membrane 12
2.7 Ionic and molecular separation 12
2.8 Membrane and stability 13
2.9 Separation and permeability 13
2.10 Membrane Swelling 13
2.11 X-ray Diffraction (xrd) 14
2.12 Scanning Electron Microscopy 14
2.13 Fourier transform infra-red spectroscopy (ftir) 15
3. Research Background 15
3.1 Graphene-based membrane 15
3.2 Potential application 16
3.2.1 Pervaporation 21
3.2.2 Gas separation 22
4. Methodology 26
4.1 Experimental work 26
4.2 Washing of glassware 27
4.3 Sample collection 27
4.4 Extraction procedure 27
4.5 Material and reagents 27
4.6 Synthesis of GO nanosheet 27
4.6.1 Synthesis of GO 27
4.6.2 Preparation of go/oe dispersion Synthesis of GO 28
4.6.3 Go/oe composite membrane 28
4.6.4 Go/q composite membrane 28
4.7 Material and membrane characterization 29
4.7.1 Permeation test 30
4.7.2 Stability performance 30
4.7.3 Degree of swelling 31
5. Results and Discussion 32
5.1 Physiochemical characterization of go based membrane 32
5.2 Filtration efficiency of go based Membrane 36
6. Conclusion and Future Perspectives 44
6.1 Innovative Mechanisms of Membrane Fabrication 44
6.2 Future improvement on the membrane preformation 45
7. References 45
Degree
Doctor
Publisher
Graduate School Jeju National University
Citation
Memon Fida Hussain. (2023). Synthesis and Application of Graphene Oxide Based Lamellar Membranes for Water Purification.
Appears in Collections:
Faculty of Applied Energy System > Electronic Engineering
Faculty of Applied Energy System > Energy and Chemical Engineering
Faculty of Applied Energy System > Mechanical Enginering
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  • Embargo2023-08-14
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