新穎材料農業：友善環境農業新穎材料研發與安全評估【土壤環境科學系/鄒裕民特聘教授、劉雨庭副教授】
| 論文篇名 | 英文：Organic fragments newly released from heat-treated peat soils create synergies with dissolved organic carbon to enhance Cr(VI) removal 中文：從熱處理泥炭土中所新釋放的有機碎片協同可溶性有機碳增強對Cr（VI）的移除 |
| 期刊名稱 | ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY |
| 發表年份,卷數,起迄頁數 | 2020, 201, 110800 |
| 作者 | Chen, Kai-Yue; Liu, Yu-Ting(劉雨庭); Hsieh, Yi-Cheng; Tzou, Yu-Min(鄒裕民)* |
| DOI | 10.1016/j.ecoenv.2020.110800 |
| 中文摘要 | 表面燃燒可以分為自然或人為所引起，其可導致表土的溫度升高至600°C。表面燃燒產生的熱可以隨後轉移到富含CO2的底土中。因此在受熱影響的厭氧環境中，土壤有機質的化學成分可能會發生變化，進而間接影響六價鉻的氧化還原及轉移。在本篇研究中將泥炭土在有限的空氣下加熱到600°C，以模擬表面燃燒過程，熱對土壤有機質的影響。接著亦觀察六價鉻在熱處理的泥炭土導致有機物組成的變化下，其移除量包含還原及吸附量。結果顯示，隨著加熱溫度的升高，土壤有機質中含氧的官能團，–CH2及–CH3脂肪族官能基和可溶性有機碳的溶出量逐漸減少。然而，隨著這些土壤有機組成的變化，移除0.1932 mM六價鉻並沒有表現出一致性的下降。加熱至200和250°C可能導致一些對此溫度敏感的土壤有機物（如木質素和其他不穩定的土壤有機質）分解及釋出的閾值。此類新釋放的有機片段協同類木質素和羧基，進而使六價鉻移除率高達99％。隨著泥炭土加熱從300°C升高至600°C，六價鉻的還原率從66％降低至20％。600°C處理泥炭土中的類黑炭物質或含芳香族官能基可能是導致六價鉻還原的主要成分。 |
| 英文摘要 | Surface fires occur naturally or anthropogenically and can raise the temperature at the soil surface up to 600 °C. The heat derived from the surface fire can be subsequently transferred into CO2-enriched subsoils. As a result, the chemical compositions of soil organic matter (SOM) may be altered in fire-impacted anaerobic environments, indirectly influencing the redox transformations of pollutants, such as Cr(VI). In this study, a peat soil was heated up to 600 °C with limited air flow to simulate the effects of heat on the SOM during surface fire events. Then, Cr(VI) removal, including reduction and sorption, by the heat-treated peat soils was determined in relation to changes in the soil organic components. The results showed that the amount of O-containing functional groups, –CH2/–CH3 units of aliphatic groups, and dissolved organic carbon (DOC) in the SOM gradually decreased with an increase in the heating temperature. The removal of 0.1932 mM Cr(VI) did not exhibit a consistent decline along with the changes in these soil components. The heating temperatures of 200 and 250 °C were the thresholds that led to the decomposition of temperature-sensitive soil organic components such as lignin and other labile SOM. Such newly released organic fragments synergized lignin-like substances and carboxyl groups, resulting in up to 99% removal of the initially added Cr(VI). As the heating temperatures were increased from 300 to 600 °C, Cr(VI) reduction decreased from 66% to 20%. The black carbon-like materials and/or aromatic-containing moieties were the major components responsible for Cr(VI) reduction in 600°C-treated peat soils. |
