易製備之鋯金屬有機骨架複合粒狀孔洞材料在揮發性有機化合物之移除研究
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2021
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金屬有機骨架(Metal-Organic Framework, MOF)是去除工業排放之揮發性有機化合物(Volatile Organic Compounds, VOC)的良好吸附材料。本論文研究合成6種易製備、結構穩定且吸附能力高之Zr-MOF(UiO-66、UiO-66-NH2、UiO-66-NO2、Zr-FUM、UiO-66-NDC、MOF-808)，並於Zr-MOF中摻入PVA進行Zr-MOF@PVA粒狀物之製備，然後針對5種常見之VOC(Acetone、IPA、Formaldehyde、Toluene、Acetic acid)進行靜態飽和吸附實驗並對Toluene進行動態吸附實驗。在靜態實驗中發現，其吸附量與材料之表面積及結構上裸露的官能基有很大的關聯，在吸附Acetone、IPA、Formaldehyde等極性的VOC時，帶有極性-NH2官能基的UiO-66-NH2雖然其表面積較低，但吸附量卻有顯著的提升。在吸附非極性的Toluene時，結構中含有較多缺陷及表面積較高之UiO-66和MOF-808，有著較高的吸附能力。動態吸附則以UiO-66@PVA對Toluene的吸附能力進行測試，從實驗所得之突破曲線計算出其動態的吸附能力為314.45 (mg/g)，並比較了三種吸附動力學，發現UiO-66@PVA對吸附Toluene是屬於擬二級模型。本研究成果顯示，Zr-MOF在VOC吸附移除上展示出優異的吸附量以及吸附率，吸附作用的主因來自Zr-MOF本身具有的高孔洞性和豐富的官能基團。
Metal-Organic Framework (MOF) is a very good adsorbent for removing volatile organic compounds (VOC) from industry. In this study, six Zr-MOFs (UiO-66, UiO-66-NH2, UiO-66-NO2, Zr-FUM, UiO-66-NDC, MOF-808) were facile prepared as bead Zr-MOF@PVA composites, and then test for static saturation adsorption experiments with 5 common VOCs (Acetone, IPA, Formaldehyde, Toluene, Acetic acid) and dynamic adsorption experiments for Toluene.The static experiments test, the structure has high adsorption capacity related to exposed functional groups. The MOF of UiO-66-NH2 has higher Acetone, IPA, and Formaldehyde adsorption capacity with polar -NH2 functional groups. Although UiO-66-NH2 has a low surface area, its adsorption capacity has increased significantly. The MOF of UiO-66 and MOF-808 have higher Toluene adsorption capacity with more defects and higher surface area. The dynamic experiments test data for UiO-66@PVA adsorption for toluene at 25 °C were fitted by three adsorption kinetic models. From the breakthrough curve obtained dynamic adsorption capacity was 314.45 (mg/g). The pseudo second-order kinetic model better described the adsorption of VOCs by UiO-66@PVA.The results of this research show that Zr-MOFs exhibit excellent adsorption capacity and adsorption rate for VOC adsorption and removal. The main reason for the superior adsorption is the high porosity and abundant functional groups of Zr-MOF itself.
Metal-Organic Framework (MOF) is a very good adsorbent for removing volatile organic compounds (VOC) from industry. In this study, six Zr-MOFs (UiO-66, UiO-66-NH2, UiO-66-NO2, Zr-FUM, UiO-66-NDC, MOF-808) were facile prepared as bead Zr-MOF@PVA composites, and then test for static saturation adsorption experiments with 5 common VOCs (Acetone, IPA, Formaldehyde, Toluene, Acetic acid) and dynamic adsorption experiments for Toluene.The static experiments test, the structure has high adsorption capacity related to exposed functional groups. The MOF of UiO-66-NH2 has higher Acetone, IPA, and Formaldehyde adsorption capacity with polar -NH2 functional groups. Although UiO-66-NH2 has a low surface area, its adsorption capacity has increased significantly. The MOF of UiO-66 and MOF-808 have higher Toluene adsorption capacity with more defects and higher surface area. The dynamic experiments test data for UiO-66@PVA adsorption for toluene at 25 °C were fitted by three adsorption kinetic models. From the breakthrough curve obtained dynamic adsorption capacity was 314.45 (mg/g). The pseudo second-order kinetic model better described the adsorption of VOCs by UiO-66@PVA.The results of this research show that Zr-MOFs exhibit excellent adsorption capacity and adsorption rate for VOC adsorption and removal. The main reason for the superior adsorption is the high porosity and abundant functional groups of Zr-MOF itself.
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鋯金屬有機骨架, 吸附, 揮發性有機化合物, 動態吸附, 靜態飽和吸附, Zr-MOF, UiO-66, VOC, adsorption, dynamic adsorption