生態農業：土壤碳蓄存之預測模型優化及驗證【土壤環境科學系/鄒裕民特聘教授、劉雨庭特聘教授】
| 論文篇名 | 英文： Synergism of Fe and Al salts for the coagulation of dissolved organic matter: Structural developments of Fe/Al-organic matter associations 中文：Fe和Al鹽對溶解有機物的混凝協同作用：Fe/Al-有機物结合物的结構演變 |
| 期刊名稱 | Chemosphere |
| 發表年份,卷數,起迄頁數 | 2023, 316: 137737 |
| 作者 | Chen, Kai-Yue; Liu, Yu-Ting(劉雨庭); Hung, Jui-Ting; Hsieh, Yi-Cheng; Tzou, Yu-Min(鄒裕民)* |
| DOI | 10.1016/j.chemosphere.2023.137737 |
| 中文摘要 | 溶解有機物（DOM）廣泛分布在水體中。鐵离子可以混凝DOM形成稳定的共沉澱物；然而，鋁（III）可能會改變Fe-DOM共沉澱物的结構和稳定性。本研究旨在研究Fe、Al和DOM的共沉澱及與Fe/Al比和pH變化相關的Fe-DOM共沉澱物的结構演变。结果顯示，衍生的Fe/Al/DOM-共沉澱物可以分为三類：（1）在pH 3.0和4.5下，與Fe–C鍵相關的角共享FeO6八面体，其Fe/(Fe + Al)比值≥0.5；（2）Fe–C鍵以及具有Fe/(Fe + Al)比值為0.25的單個Fe八面體；（3）在pH 6.0下，當Fe/(Fe + Al)比值≥0.5時, 類ferrihydrite的Fe與Fe–C鍵相連結。在pH 3.0下，随着Al比例的增加，共沉澱物的Fe和C穩定性增加；然而，纯Al-DOM共沉澱物即使展示了對DOM有最大的去除能力，但其相當不稳定。Al-DOM複合物和/或DOM吸附的Al與Fe或Fe-DOM共沉澱物的外表面的结合可以穩定DOM，在pH 4.5下導致较低的C溶解。盡管優先形成Fe/Al氫氧化物會降低pH 6.0下的Fe/Al溶解度，但DOM與Fe/Al氢氧化物的吸附而不是共沉澱可能會降低共沉澱物中C的穩定性。鋁陽離子抑制了DOM從Fe/Al/DOM-共沉澱物中的釋放，促進了廢水處理和再利用效率的提高，解决了水資源短缺问题。本研究表明，鋁和溶液pH對Fe-DOM共沉澱物的结構變化有很大影響，並間接控制了水中Fe、Al和C濃度的動態变化。 |
| 英文摘要 | Dissolved organic matter (DOM) is distributed ubiquitously in water bodies. Ferric ions can flocculate DOM to form stable coprecipitates; however, Al(III) may alter the structures and stability of Fe-DOM coprecipitates. This study aimed to examine the coprecipitation of Fe, Al, and DOM as well as structural developments of Fe-DOM coprecipitates in relation to changes in Fe/Al ratios and pHs. The results showed that the derived Fe/Al/ DOM-coprecipitates could be classified into three categories: (1) at pH 3.0 and 4.5, the corner-sharing FeO6 octahedra associated with Fe–C bonds with Fe/(Fe + Al) ratios ≥0.5; (2) the Fe–C bonds along with single Fe octahedra having Fe/(Fe + Al) ratios of 0.25; (3) at pH 6.0, the ferrihydrite-like Fe domains associated with Fe–C bonds with Fe/(Fe + Al) ratios ≥0.5. At pH 3.0, the Fe and C stability of the coprecipitates increased with increasing Al proportions; nonetheless, pure Al-DOM coprecipitates were unstable even if they exhibited the maximum ability for DOM removal. The associations of Al-DOM complexes and/or DOM-adsorbed Al domains with external surfaces of Fe domain or Fe-DOM coprecipitates may stabilize DOM, leading to lower C solubilization at pH 4.5. Although the preferential formation of Fe/Al hydroxides decreased Fe/Al solubilization at pH 6.0, adsorption instead of coprecipitation of DOM with Fe/Al hydroxides may decrease C stabilization in the coprecipitates. Aluminum cations inhibit DOM releases from Fe/Al/DOM-coprecipitates, promoting the treatment and reuse efficiencies of wastewater and resolving water shortages. This study demonstrates that Al and solution pH greatly affect the structural changes of Fe-DOM coprecipitates and indirectly control the dynamics of Fe, Al, and C concentrations in water. |
| 發表成果與本中心研究主題相關性 | 可溶性有機質DOM與鐵鋁多價陽離子的共沉澱物有助於碳的固定, 但因為鐵/鋁與有機碳的莫耳比對此共沉澱物的穩定性有很大的影響, 故要將可溶性有機碳穩定下來避免淋洗流失, 必須給予最佳的金屬與有機碳比例, 才有利於碳的蓄存。 |
