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：Hybridize magnesium-iron layered double hydroxide with biopolymers to develop multiple pathways for phosphate sorption and release: a potential slow release phosphorus fertilizer 中文：將鎂鐵層狀雙氫氧化物與生物高分子混合，以開發多種磷吸附和釋放途徑：潛在的緩釋磷肥 |
| 期刊名稱 | Chemical Engineering Journal |
| 發表年份,卷數,起迄頁數 | 2023. 473:145451 |
| 作者 | Li, Wen-Hui; Hsu, Liang-Ching; Tzou, Yu-Min(鄒裕民); Chen, Yi-Chun; Teah, Heng Yi; Kung, Yu-Yu; Chen, Han-Yu; Liu, Yu-Ting(劉雨庭)* |
| DOI | 10.1016/j.cej.2023.145451 |
| 中文摘要 | 化肥的密集使用對於維持食物生產或造成土壤退化和農業污染帶來了一個困境。特別重要的是要減少磷（P）肥料的使用，因為它是有限資源。這種情況需要開發高效的磷肥以應對即將來臨的磷缺乏問題。將含0.5和2.5 M金屬前驅體的Mg-Fe層狀雙氫氧化物（LDH）與幾丁質（CTS）和羧甲基纖維素（CMC）混合，以設計緩釋磷肥的替代方案。儘管磷酸鹽（PO4）吸附能力按照Mg-Fe LDH > 2.5LDH-CTS/CMC > 0.5LDH-CTS/CMC的順序排列，但0.5LDH-CTS的PO4釋放速率常數約比其他樣本低2.6 - 7.6倍，即使在2688小時後仍未達到平衡。Fe-EXAFS數據暗示了0.5LDH-CTS的層狀雙氫氧化物中同質取代的最大程度。除了層間PO4之外，P-XANES數據還建議0.5LDH-CTS上存在有機-P和Fe(III)-P，導致多功能保留過程。在2688小時的PO4釋放後，LDH結構逐漸風化，主要轉化為以鐵（氫氧）氧化物為主的結構。然而，在0.5LDH-CTS中，有14.3％的Fe庫存在於Fe(II)物種中。Fe(II)領域與可能保留的Mg-Fe LDH結構和非晶Mg(OH)2一起提供了PO4的鍵合位點，是持續PO4釋放超過2688小時的關鍵因素。這種延長的PO4釋放期間使得使用與生物高分子混合的LDH作為潛在的緩釋磷肥的替代方案變得更具前景。 |
| 英文摘要 | The intensive use of chemical fertilizers presents a dilemma for sustaining food production or causing soil degradation and posing agricultural contamination. The reduction of phosphorus (P) fertilizer usage is particularly crucial because it is a limited resource. This situation calls for the development of efficient P fertilizers to address the impending P deficiency. Mg-Fe layered double hydroxides (LDH) with 0.5 and 2.5 M metal precursors were hybridized with chitosan (CTS) and carboxymethyl cellulose (CMC) to design alternatives of slow release P fertilizers. While phosphate (PO4) sorption capacities were in the order of Mg-Fe LDH > 2.5LDH-CTS/CMC > 0.5LDH-CTS/CMC, PO4 release from 0.5LDH-CTS exhibited a rate constant ~2.6 – 7.6 times lower than that of other samples, which had not reached equilibration even after 2688 h. Fe-EXAFS data implied the greatest degree of isomorphic substitution into LDH interlayer of 0.5LDH-CTS. In addition to intercalated PO4, P-XANES data also suggested the organic-P and Fe(III)-P on 0.5LDH-CTS, causing versatile retention processes. After 2688 h of PO4 release, LDH structure gradually weathered and transformed primarily into a structure dominated by ferric (oxyhydrox)oxides. On 0.5LDH-CTS, however, 14.3% of Fe inventory was contributed by Fe(II) species. The Fe(II) domains in conjunction with the likely remaining Mg-Fe LDH structure and amorphous Mg(OH)2 provided bonding sites for PO4, serving as the key factor for the continuous PO4 release beyond 2688 h. Such extended duration of PO4 release warrants the use of LDHs hybridized with biopolymers as promising substitutes for slow release P fertilizers. |
| 發表成果與本中心研究主題相關性 | 此研究致力於(1) 磷肥的可持續使用：磷是植物生長所需的重要養分，但它是一個有限資源，且過度使用磷肥可能導致環境問題，如水體污染。開發高效的緩釋磷肥有助於減少磷肥的使用，有助於維護土壤健康；(2) 環境保護：透過減少過度使用化學肥料和減少磷的流失到環境中，緩釋磷肥有助於減少水體中的磷污染，這有助於保護生態系統的健康。這兩項研究主題均與永續農業研究密切相關，因為它有助於改善農業實踐，提高農業的環境和經濟可持續性，同時也有助於保護自然環境。 |
