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研究生： 陳韋翰
Chen, Wei-Han
論文名稱： 含鐵廢酸資源化製備奈米氧化鐵及氧化鐵/矽砂吸附重金屬之複合材料研究
Preparation of nano iron oxide from recycled waste pickle acid and its heavy metal adsorption study by the coating on silica sand
指導教授： 王竹方
口試委員: 張怡怡
蔣本基
談駿嵩
學位類別： 碩士
Master
系所名稱： 原子科學院 - 生醫工程與環境科學系
Department of Biomedical Engineering and Environmental Sciences
論文出版年： 2012
畢業學年度： 100
語文別： 英文
論文頁數： 82
中文關鍵詞： 資源化 、氧化鐵 、電漿 、玻璃化
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    • 本研究將含鐵廢酸資源化製備成奈米氧化鐵矽砂複合材料，應用在重金屬與放射性核種之吸附研究。研究過程中嘗試利用交流熱電漿技術製備磁性不同之γ相氧化鐵(γ–Fe2O3)和α相氧化鐵(α–Fe2O3)。在熱電漿作用過程中，γ–Fe2O3會逐漸轉換成α–Fe2O3，因此可由順磁性大小之改變分辨樣品中γ–Fe2O3和α–Fe2O3的比例。使用異相懸浮法製備之氧化鐵覆膜矽砂(IOCS)，被用來吸附廢水樣品中重金屬(鉻(VI), 鉛(II), 鎳(II), 鋅(II), 鎘(II), 鈷(II), 鍶(II)與銫(I))等金屬離子，研究發現IOCS對於重金屬鉻(VI), 鉛(II), 鎳(II), 鋅(II), 鎘(II), 鈷(II)具有較佳的吸附效果，而對於鍶及銫元素的吸附能力則較弱。吸附後之IOCS利用電漿熔融技術玻璃化。

    In the study, the iron containing waste acid was applied to recycle nano iron oxide materials in preparing a Fe/Si absorbent for the adsorption study. The recycled iron oxide material is compatible to reagent grade. It has similar paramagnetic properties and purity. Recently, Magnetic nanoparticles have attracted a great deal of attention due to their versatile applications as in advanced functional materials on high-density recording media, biomedical, magnetic fluids, catalysts and adsorbents etc. Iron oxide nanoparticles have many merits compared to other nanoparticles such as less toxicity, bio compatible and more chemically stable. Hence, it is worthy to address our investigation toward the characteristics of these nanoparticles. Conventionally, iron oxide nanoparticles have been prepared by aqueous solution method, which involved the oxidation and reduction reaction of ferrous and ferric ions. However more and more preparation methodologies have been developed for nanoparticle synthesis. Among those, some are thermal plasma reactions. In this studies, a fast track AC thermal plasma methodology is involved in the synthesis of γ–Fe2O3 and α–Fe2O3 from ferrous waste acid.

    During the thermal plasma treatment, the crystallite of γ–Fe2O3 will transform to α–Fe2O3 by the evident of paramagnetic strength disappearance. Therefore we have developed a unique technique to distinguish the ratio of γ–Fe2O3 and α–Fe2O3 in its mixture. Preparation and characterization of silica coated with iron oxides are described in the study. A heterogeneous reaction is employed to coat γ–Fe2O3 and α–Fe2O3 on silica sands (IOCS). The adsorption of heavy metal ions (Cr(VI), Pb(II), Ni(II), Zn(II), Cd(II)) and radionuclides (Co(II), Sr(II), Cs(I)) through modified IOCS is examined. The adsorption result for heavy metals group is strong. As for radionuclide adsorption study, only cobalt has strong adsorption on IOCS surface. Strontium and Cesium are weakly adsorbed on IOCS surface. The plasma vitrefication experiments toward radionuclide adsorbed by IOCS explained the feasibility of radioactivity fixation.

    中文摘要 I Abstract II Acknowledgement IV Chapter 1 Motivation 1 Chapter 2 Literature review 4 2.1 Introduction of Iron Containing Waste Acid 4 2.2 Plasma Technology 8 2.2.1 Plasma and Its Type 8 2.2.2 Thermal Plasma Treatment of Wastes 11 2.2.3 Superiority of Plasma Synthesis 14 2.3 Iron Oxide Coated Silica (IOCS) 17 2.3.1 Adsorption of IOCS 19 2.3.2 Mechanism of Metal Sorption by IOCS 21 2.4 Determining Mechanisms of Desorption and Regeneration 22 2.5 Vitrification 23 Chapter 3 Experiments 26 3.1 Chemical Reagents and Instruments 26 3.1.1 Chemical Reagents 26 3.1.2 Experimental Instruments 28 3.2 Preparation of Iron Oxide 29 3.2.1 Synthesis of Iron Oxide 29 3.2.2 Synthesis of Iron-Oxide Coating Silica (IOCS) 31 3.3 Experimental and Analysis Equipment 33 3.4 Adsorption Experiment 45 3.5 Vitrification test 46 Chapter 4 Result and discussion 47 4.1 Characterization of Iron Species During the Treatment 47 4.1.1 Element Contents in Various Iron Species 47 4.1.2 FT-IR spectroscopy 49 4.1.3 XRD Profile 51 4.1.4 Dynamic Laser Spectrum 53 4.1.5 Scanning Electron Microscope 55 4.1.6 Magnetization of α - Fe2O3 and γ - Fe2O3 56 4.2 Characterizations and Properties of IOCS 58 4.2.1 Energy Dispersive X-ray Spectroscopy 58 4.2.2 FT-IR Spectrum 60 4.2.3 XRD Profile 62 4.2.4 Magnetic Property 63 4.3 Adsorption Study 66 4.3.1 Comparison of Adsorption abilities among various materials 67 4.3.2 Kinetics of Adsorption 69 4.3.3 pH Dependent on Adsorption behavior 71 4.4 Waste Vitrification 75 Chapter 5 Conclusions and Suggestions 77 5.1 Conclusions 77 5.2 Suggestions 79 Chapter 6 Reference 80

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