循環農業：農業廢棄物高價值化【環境工程學系/林坤儀特聘教授】
| 論文篇名 | 英文：Recycling spent iron-based disposable-chemical-warmer as adsorbent for as(v) removal from aqueous solution 中文：回收廢鐵基一次性化學加熱器作為吸附劑從水溶液中去除 as(v) |
| 期刊名稱 | Resources, Conservation and Recycling |
| 發表年份,卷數,起迄頁數 | 2021,168, |
| 作者 | Wang, Haitao*; Liang, Xiao; Liu, Yingying; Li, Tielong; Lin, Kun-Yi Andrew(林坤儀) |
| DOI | 10.1016/j.resconrec.2020.105284 |
| 中文摘要 | 鐵基一次性化學取暖器（DCW）的使用每年都會產生大量的固體廢物（僅中國和日本每年至少產生200萬噸固體廢物），現在直接作為垃圾丟棄。在這項工作中，用過的 DCW 作為吸附劑回收，用於從水中去除 As(V)。我們首次闡明用過的 DCW 是一種磁性納米複合材料，主要由 Fe3O4 納米顆粒和具有大表面積 (56.6 m2/g) 的蛭石組成。詳細的形態表徵揭示了在蛭石表面形成了 Fe3O4 納米顆粒，平均晶粒尺寸估計為 ~10 nm。吸附劑表現出超順磁性，飽和磁化強度高達40emu/g，可用於水處理後的吸附劑回收。 As(V)吸附等溫線符合Langmuir等溫線模型，在中性pH和室溫下最大吸附量為130 mg/g。 As(V) 的吸附能力優於大多數報導的吸附劑，這歸因於吸附劑的混合結構。吸附動力學曲線由擬二級模型很好地描述。 As(V) 的有利 pH 值低於 8.0，並且吸附劑對常見的共存陰離子（SO42−、H2PO4− 和 SiO32−）具有良好的 As(V) 選擇性。此外，吸附劑可以很容易地使用 0.1 M NaOH 水溶液作為洗脫液進行再生。在連續 10 次吸附-解吸循環後，對 As(V) 的吸附容量仍超過 85%。這項工作提供了一種以最少的努力回收用過的 DCW 的有效方法。 |
| 英文摘要 | The use of iron-based disposable-chemical-warmer (DCW) produces huge amount of solid wastes every year (e.g. at least 2 million tons of solid waste every year for China and Japan only), which are directly abandoned as trash now. In this work, spent DCW was recycled as adsorbent for As(V) removal from water. For the first time, we elucidated that the spent DCW was a magnetic nanocomposite consisted mainly of Fe3O4 nanoparticles and vermiculite with large surface area (56.6 m2/g). The detailed morphology characterization revealed the formation of Fe3O4 nanoparticles on vermiculite's surface, with the average crystallites’ size estimated to be ~10 nm. The adsorbent exhibited superparamagnetism with a strong saturation magnetization value 40 emu /g, which can be utilized to recollect the adsorbent after water treatment. The As(V) adsorption isotherm conformed to Langmuir isotherm model with the maximum adsorption capacity of 130 mg/g under neutral pH and room temperature. The adsorption capacity for As(V) outperformed most of the reported adsorbents, which was attributed to the hybrid structure of the adsorbent. The adsorption kinetic curve was well described by the pseudo-second order model. The favorable pH for As(V) was below 8.0, and the adsorbent had good As(V) selectivity over common co-existing anions (SO42−, H2PO4−, and SiO32−). Moreover, the adsorbent could be readily regenerated using 0.1 M NaOH aqueous solution as eluting solution. The adsorption capacity towards As(V) was still over 85% after 10 consecutive adsorption-desorption cycles. This work provided an efficient way for recycling spent DCW with minimal efforts. |
| 發表成果與本中心研究主題相關性 | 透過本研究可進一步建立可用於循環經濟中將廢棄物及衍生物轉換成價值附加產物之技術。 |
