아주대학교

목차

Chapter 1 Introduction 1
1.1 General overview 1
1.2 Objectives and scope 5
1.3 Organization of the dissertation 6
Chapter 2 Literature review 7
2.1 Per- and polyfluoroalkyl substances 7
2.2 Advanced water treatment 12
2.2.1 Adsorption 12
2.2.2 Advanced oxidation process. 14
2.2.3 Advanced reduction process. 17
2.3 Functional materials 19
Chapter 3 Adsorptive Removal of PFOA Using ZnO-Ag-ZnAl2O4 Composites 22
3.1 Introduction. 22
3.2 Materials and methods 24
3.2.1 Materials 24
3.2.2 Preparation of absorbents 24
3.2.3 Sorption experiments 25
3.2.4 Disinfection experiments 26
3.2.5 Characterization 29
3.2.6 Kinetic and isotherm analyses. 29
3.2.7 Computational methods 31
3.3 Results and discussion 33
3.3.1 Characterization of the synthesized adsorbents 33
3.2.2 Removal of PFOA with the ZnO-Ag-ZnAl2O4 composite 36
3.3.3 Effect of operating parameters on PFOA removal 39
3.3.4 Adsorption kinetics and isotherm 41
3.3.5 Thermodynamic analysis 44
3.3.6 PFOA removal mechanisms 46
3.3.7 Disinfection of E. coli in livestock wastewater 52
3.4 Summary 54
Chapter 4 Oxidative Removal of PFOA with MMO-TiO2 Photocatalysts under Visible-Light 55
4.1 Introduction. 55
4.2 Materials and methods 58
4.2.1 Materials 58
4.2.2 Synthesis method of photocatalyst 58
4.2.3 Photocatalytic degradation 59
4.2.4 Characterization of ZnAl-TiO2 and MMO-TiO2 61
4.3 Results and discussion 62
4.3.1 Characterization of ZnAl-TiO2 and MMO-TiO2 62
4.3.2 Enhanced removal of PFOA using MMO-TiO2 under visible light irradiation 65
4.3.3 Verification of effective ROS species in PFOA degradation 66
4.3.4 Effect of operational parameters and water matrices on PFOA degradation 69
4.4 Summary 75
Chapter 5 Oxidative Removal of PFOA with PDS/LDH process and Optimization using Response Surface Methodology and Artificial Neural Network 76
5.1 Introduction. 76
5.2 Materials and methods 79
5.2.1 Materials 79
5.2.2 LDH preparation 79
5.2.3 PFOA removal experiment 80
5.2.4 Characterizations of LDH 80
5.2.5 PFOA removal modeling using RSM and ANN analysis 81
5.3 Results and discussion 86
5.3.1 Characterizations of LDH 86
5.3.2 PFOA removal by ZnAl-LDH as an adsorbent and heterogeneous catalyst 89
5.3.3 Comparison of the significance of operating parameters through optimized RSM and ANN models 91
5.3.4 Optimization and Verification through RSM and ANN Model Analysis 98
5.3.5 Effect of radical species on PFOA degradation 101
5.3.6 Effect of hydroxyl radical restraint on PFOA degradation 102
5.3.6 Reusability of ZnAl-LDH in PDS/LDH system 104
5.4 Summary 106
Chapter 6 Reductive Removal of PFOA with UV/sulfite process enhanced with OH⁻ 107
6.1 Introduction 107
6.2 Materials and methods 110
6.2.1 Materials 110
6.2.2 UV/sulfite experiment 110
6.2.3 Analytic method 111
6.3 Results and discussion 112
6.3.1 OH⁻ actively participates in PFOA degradation, significantly enhancing the removal efficiency 112
6.3.2 OH⁻ facilitates the chain degradation reaction of PFOA 121
6.3.3 The formation of eaq⁻ is prevailing in the UV/sulfite system, and the PFOA is removed through the reduction process 125
6.3.4 Process parameters influence the PFOA removal 132
6.4 Summary 135
Chapter 7 Conclusion and Future Perspectives 136
7.1 Conclusions 136
7.2 Future Perspectives 139
References 141
국문 초록 167