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標題: | 電紡木質素磺酸鹽活性碳纖維-製備、性質分析及應用 Electrospun Lignosulfonate Activated Carbon Fiber as Valuable Metal Ion Adsorbents – Preparation, Characterization, and Application |
作者: | Szu-Han Wang 王思涵 |
指導教授: | 張豐丞(Feng-Cheng Chang) |
關鍵字: | 木質素磺酸鹽,活性碳纖維,靜電紡絲法,物理活化,金屬離子,吸附機制, lignosulfonate,activated carbon fiber,electrospinning,physical activation,metal ion,adsorption mechanism, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 隨著科技日新月異,電子廢棄物回收成為刻不容緩的議題。眾多解決方案中,以生質廢棄物回收電子垃圾為較環境友善的辦法。木質素磺酸鹽是近來廣受歡迎的生質廢棄物。每年,全球造紙業產生上萬噸的木質素磺酸鹽,其豐富的碳含量,具備作高值化利用的潛能。 此研究分為兩部分:木質素磺酸鹽活性碳纖維研發、以及木質素活性碳纖維金屬離子吸附研究。第一部份利用靜電紡絲法紡織木質素纖維膜,接著以二氧化碳進行物理活化,產出木質素活性碳纖維。進一步以物理及化學方法分析材料特性,以選擇材料最佳活化時間。材料結構由電子掃描顯微鏡(Scanning electron microscope, SEM)以及比表面積與孔徑分佈儀進行檢測。材料表面性質由元素分析儀、X射線光電子能譜儀(X-Ray Photoelectron Spectroscopy, XPS)、傅立葉轉換紅外光譜儀(Fourier Transform Infrared Spectroscopy, FTIR)、拉曼光譜儀(Raman Spectroscopy)進行分析。 第二部分利用第一部分最佳條件之木質素活性碳纖維,分別以批次法吸附二價銅離子、三價金離子。由於銅、金離子為電子廢棄物中含量、價值較高之金屬,故選擇其作為吸附對象。吸附行為主要由三個角度分析:不同金屬離子濃度對材料吸附量之影響(吸附等溫線)、不同金屬離子溶液酸鹼值對材料吸附量之影響、不同吸附時間對吸附量之影響(吸附動力學)。並進一步以不同等溫線模型、動力學模型擬合實驗數據,由赤池信息量準則(Akaike Information Criterion, AIC)選擇較佳模型。此外,亦由金屬離子脫附試驗評估木質素磺酸鹽活性碳纖維之重複利用性。 分析結果顯示,經60分鐘活化之木質素磺酸鹽活性碳纖維具較高比表面積、微孔體積,及較多酸性官能基,故有潛力成為較佳金屬離子吸附劑。根據吸附行為研究,銅離子與金離子之吸附機制皆為物理、化學吸附混合,其中,金離子吸附較傾向於化學吸附。此外,吸/脫附試驗顯示,木質素磺酸鹽活性碳纖維在三輪吸脫附循環後,仍具備吸附銅、金離子之效能。整體而言,此研究開拓物理活化木質素磺酸鹽活性碳纖維與其回收有價值金屬離子之應用。 Living in an electronic-dominated world, e-wastes have become an urgent problem. From an environment point of view, an effective solution would be leveraging renewable source, preferably another type of wastes, to recycle these metals. One waste that is easy to deal with is lignosulfonate. Tons of them were produced as byproduct by the pulp industry every year. As a carbon-rich polymer, it is worth the attention for a higher-value investment. The research is divided into two parts, including the development of lignosulfonate activated carbon fiber (LACF) and its metal recovery behavior. LACF was developed through the electrospinning technique, followed by a series of CO2-based physical activation. Physical and chemical characterization were implemented to find the optimized activation time for developing LACF. For the material structure, scanning electron microscope (SEM) and specific surface area and pore size distribution analyzer were utilized. In terms of the surface properties, elemental analysis, X-Ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR), and Raman Spectroscopy were applied. Throughout the second part of the study, the adsorption behavior of Cu(II) and Au(III) metal ions were respectively tested with batch methods on the lab-made LACF. The metal ions were chosen for their larger amount and higher value. Examinations included the adsorption capacity change according to various adsorbate concentrations, adsorbate pH environment, and adsorption equilibrium time. In order to explore the adsorption mechanism, isotherm and kinetic modeling were performed, and the Akaike Information Criterion (AIC) was implemented to choose the better model. Further, desorption tests were executed to evaluate the reusability of LACF. It was observed that LACF with a 60-min activation treatment possessed a higher specific surface area, micropore ratio, and more acidic functional groups, which potentially made it a better candidate for metal-ion adsorption. According to the adsorption behavior study, both Cu(II) and Au(III) ions were adsorbed onto LACF with a mix of physi- and chemisorption, while the latter was more inclined to chemisorption. Furthermore, the LACF could recover these two metal ions after 3 adsorption-desorption cycles. Overall, this study paves the way for physically activated lignosulfonate carbon and its application in recovering valuable metal ions. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76482 |
DOI: | 10.6342/NTU202001308 |
全文授權: | 同意授權(全球公開) |
電子全文公開日期: | 2023-08-05 |
顯示於系所單位: | 森林環境暨資源學系 |
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