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研究生: 馬漢德
Mahasti, Nicolaus Nezha Nunez
論文名稱: 以流體化床結晶法自廢水中回收金屬氧化物做為光芬頓程序之異相催化劑
Recycling of metal oxides from synthetic wastewater by fluidized-bed crystallization exemplified as a catalyst for UVA-assisted Fenton technology
指導教授: 黃耀輝
Huang, Yao-Hui
學位類別: 博士
Doctor
系所名稱: 工學院 - 化學工程學系
Department of Chemical Engineering
論文出版年: 2020
畢業學年度: 108
語文別: 英文
論文頁數: 117
外文關鍵詞: fluidized-bed, homogeneous crystallization, iron oxyhydroxide, crystallization ratio, hydraulic condition
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  • This work applied fluidized-bed crystallization (FBC) and fluidized-bed homogeneous crystallization (FBHC) to recover iron-contaminating from wastewater as iron oxide particles, such as FeOOH, Fe3O4, and FeCu@SiO2. The crystal of FeOOH was recovered from synthetic wastewater at the optimum value of pH 6.5 – 7.5, surface loading (L) of 0.6 kg/m2/h for an input ferrous concentration ([Fe2+]in) of 100-300 mg/L, resulting in the total iron removal (TR) of more than 99% and crystallization ratio (CR) of 85%. The X-ray diffractometry (XRD) analysis showed that the pellet product was a mixture of iron oxyhydroxide polymorph, including goethite (α-FeOOH), and lepidocrocite (γ-FeOOH). The magnetite (Fe3O4) was obtained under the conditions of pH = 8.5-9.5 and (Fe2+)in = 100 – 500 mg/l, the TR and CR values were 99% and 77%, respectively. The highly pure Fe3O4 pellets (average size: 0.5 – 0.7 mm) obtained from FBHC had high magnetization and low coercivity values of 79.45 emu/g and 5.6 Oe, respectively, indicating the property of superparamagnetism of recovered magnetite. A Fenton-like reaction of RB5 azo dye was catalyzed with the Fe3O4 pellets under conditions of UVA irradiation, pH = 2.75 – 3.0, initial peroxide concentration of 10 mM (340 mg/L), and catalyst loading of 2 g/l. The efficiencies of decolorization and mineralization reached about 99% and 68%, respectively. Iron and copper were also removed from synthetic wastewater as binary oxide compound coated on the surface of the silica seed. Under the optimum pH of 7.5 – 8.5, about 90% and >99% of iron and copper could be removed for CR and TR respectively.

    CONTENTS Abstract II Acknowledgement III Contents IV List of Tables IX List of Figures X I. Introduction 1 1.1 Background 1 1.2 Research Objective 4 II Literature Review 6 2.1 Iron Oxidation 8 2.2 Solubility Curve 10 2.3 Supersaturation condition 17 2.4 Fluidized-bed crystallization 18 2.5 Fluidization Velocity 21 2.6 Heterogeneous Fenton-Like Process 22 III Materials and Methods 24 3.1 Framework of the research 24 3.2 Materials 25 3.3 Experiment Procedure 26 3.3.1 Jar Test Experiments 26 3.3.2 Synthesis of Iron Oxide crystals 27 3.3.3 Iron Removal Experiments 29 3.3.4 The synthesis of FeCu@SiO2 29 3.3.5 Magnetite product application in mineralization of organic pollutant 30 3.4 Analytical Methods 32 IV Results and Discussions 35 4.1 Chemical Precipitation of FeOOH 35 4.2 FeOOH Synthesis by FBHC 39 4.3 Iron recovery as FeOOH by FBHC process 40 4.3.1 Iron Removal vs Time 42 4.3.2 Iron Removal vs pH 43 4.3.3 Dissolved Oxygen Consumption 44 4.3.4 Carbonate Consumption 46 4.3.5 Iron Removal vs Surface Loading 48 4.3.6 The Effect of supersaturation condition 50 4.4 FBHC Product Analysis for FeOOH 52 4.4.1 XRD Analysis 52 4.4.2 SEM Analysis 53 4.4.3 BET Analysis 54 4.5 Synthesis of Magnetite (Fe3O4) by FBHC 55 4.6 Iron recovery as Fe3O4 by FBHC process 56 4.6.1 Iron recovery as Fe3O4 57 4.6.2 Iron Removal vs pH 58 4.6.3 Dissolved Oxygen Consumption 59 4.6.4 Inorganic Carbon Residual 60 4.6.5 Ferrous ion consumption 61 4.6.6 Effect of cross-sectional loading 62 4.6.7 The Effect of supersaturation condition 63 4.7 Characterization of Magnetite Product 66 4.7.1 XRD Analysis 66 4.7.2 FTIR Analysis 67 4.7.3 SEM Analysis 68 4.7.4 SQUID-VSM 69 4.7.5 BET Surface Area Analysis 70 4.8 Recovery of iron and copper as of FeCu@SiO2 by FBC 70 4.9 FeCu@SiO2 Particle Characterization 71 4.9.1 Optical Camera 71 4.9.2 XPS 72 4.9.3 SEM 74 4.9.4 BET 75 4.10 Removal of iron and copper by FBC process 75 4.10.1 Effect of Initial [Fe2+] / [Cu2+] Ratio 75 4.10.2 Effect of Equilibrium pH on The Iron and Copper Removal Efficiency 76 4.10.3 The Iron – Copper Ratio Deposited onto the SiO2 Surface 78 4.10.4 Effect of pH on The Deposition Rate of Iron and Copper on SiO2 Surface 81 4.10.5 Effect of Organic Contaminant on The Removal Efficiency of Iron and Copper 82 4.11 Exemplification of Fe3O4 from FBHC Product in UVA-Assisted Three-Phases Fenton – Like Technology 85 4.11.1 The Decolorization and Degradation of RB5 by Three-Phase Fluidized Photo-Assisted Fenton-Like Process 86 4.11.2 The Type of ROS (Reactive Oxygen Spesies) In The Fenton – Like Reaction Catalyzed by Fe3O4 89 4.11.3 Kinetic Study 92 4.11.4 Effect of Light Irradiation 95 4.11.5 The Recyclability of Fe3O4 Catalyst 97 4.11.6 The Treatment of Real Wastewater by Three-Phase Fluidized Photo-Assisted Fenton-Like Process 98 V Conclusions and Recommendations 101 5.1 Conclusions 101 5.2 Recommendation 103 References 104

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