아주대학교

목차

Chapter 1 Background Study 1
1.1 Demand and Application of Photocatalyst Materials 1
1.2 TiO2 as a Photocatalyst Material 4
1.3 Drawbacks of TiO2 as a Photocatalyst Material 5
1.4 Strategies for Enhancing TiO2 Photoactivity 6
1.4.1 Exposing highly reactive facets through morphology control 6
1.4.2 Doping 7
1.4.3 Defect formation 8
1.4.4 Forming Composite Materials 9
1.4.5 Forming Mixed phase TiO2 junctions 10
Chapter 2 Formation Of Composite Materials With TiO2 For Enhanced Photocatalytic Activity 13
2.1 SnS2/TiO2 Composite with controlled exposure of {101} facets 13
2.1.1 Synthesis of SnS2/TiO2 composite 14
2.1.2 Characterization of SnS2/TiO2 Heterojunction 17
2.1.3 Photoactivity of SnS2/TiO2 composite 32
2.1.4 Charge transfer mechanism across SnS2/TiO2 heterojunction 34
2.2 TiO2/C composite derived from NH2-MIL-125 41
2.2.1 Synthesis of TiO2@C composite 42
2.2.2 Characterization of TiO2@C Heterojunction 43
2.2.3 Photoactivity of TiO2@C composite 56
2.3 Conclusion 58
Chapter 3 Mixed Phase TiO2@C Nanocomposites Derived From NH2-MIL-125 (Ti) And Its Enhanced Photocatalytic Performance Activity 60
3.1 Introduction 60
3.1.1 Experimental Section 62
3.2 Characterization of Mixed-Phase TiO2@C Composites 64
3.3 Application of Mixed Phase TiO2@C on Photocatalytic Activity 72
3.4 Charge Transfer Mechanism in Mixed-Phase TiO2@C Composite 77
3.5 Conclusion 80
Chapter 4 Controlling defects in TiO2 nanosheets 81
4.1 Introduction 81
4.2 Synthesis of defective TiO2 nanosheets 83
4.2.1 Surface Treatment of aTiO2ns 83
4.2.2 Bulk Treatment of aTiO2ns 83
4.2.3 Surface modification of bTN 84
4.3 Surface Treatment of aTiO2ns at RT 86
4.4 Bulk reduction of aTiO2ns (bTN) with NaBH4 at 300 °C 91
4.4.1 Photoactivity of bTNs with their defect distribution 103
4.5 Surface modification of bTN at RT 112
4.6 Proposed mechanism for the enhanced photoactivity of bTN 117
4.7 Conclusion 120
References 122