漏油是海洋生態系統及其周邊的嚴重問題之一，已有一些技術可緩解這一問題，其中之一就是吸收。本研究探討使用自然可得的生物質，即海藻酸鈉，作為吸收劑合成的前體。雖然海藻酸鹽吸收劑合成和改性的各種方法已被廣泛研究，但關於凝膠時間對其性質和吸收率的影響所知甚少。本研究使用 1 w/v % 海藻酸鈉與 1 wt% CaCl 交聯 0、3、6 和 12 小時所得之海藻酸鹽氣凝膠(AA)分別稱為 AA-0、AA-3、AA-6、AA-12。凝膠時間對 AA 物理化學性質的影響藉由電感耦合等離子體發射光譜儀 (ICP-OES) 分析、使用壓汞孔隙率計 (MIP) 量測總孔體積和使用萬能測試機（UTM）評估其抗壓強度；結果顯示凝膠時間越長，表觀密度和鈣含量增加，從而增加了 AA 氣凝膠的最大應力。本研究使用柴油為模型吸收物。在合成的 AA 中，AA-3 具有最高的吸收能力（Q=11.20 g/g）、可重複使用性（最多 29 次循環）和再吸收能力（Q= 4.09 g/g）。通過添加單寧酸和十二烷硫醇進行表面改性，將親水性 AA-3 轉化為更疏水的 AA-3Do。傅里葉變換紅外 (FTIR) 數據證實了在 AA-3Do 中成功地加入了添加劑。 AA-3Do 顯示能極快速吸收柴油，初始速率 ((R_0) 為 1.12E+09 g/g.s，但緩慢地吸收水 (R_0 = 27.6526 g/g.s)，在其動力學數據中觀察到 2 吸收平衡。擬二級動力學和兩步線性驅動力 (LDF) 模型分別可最佳地描述柴油和水的吸收。本研究還探討了可重複使用性，並證明了 AA-3Do 偏好吸收柴油勝過吸收水。

The oil spill is one of the serious issues for the marine ecosystem and its surrounding, thus some techniques have been established to alleviate this problem, one of which is absorption. This study explored the use of naturally available biomass, namely sodium alginate, as the precursor for absorbent synthesis. While various methods for alginate absorbent synthesis and modifications have been extensively studied, not much is known about the effect of gelation time on its properties and absorptivity. Here, alginate aerogels, namely AA-0, AA-3, AA-6, AA-12, were prepared using 1 w/v % sodium alginate crosslinked with 1 wt% CaCl under gelation times of 0, 3, 6, and 12 h, respectively. The influence of gelation time on the physico-chemical properties of the AAs was evaluated by means of inductively coupled plasma optical emission spectrometer (ICP-OES) analysis, total pore volume using Mercury Intrusion Porosimeter (MIP), and compressive strength using the Universal Testing Machine (UTM); and showed that longer gelation time, the apparent density and the calcium content were increased, therefore increasing the maximum stress of the AA aerogel. Diesel was used as the model absorbate in this study. Out of the synthesized AAs, the one prepared with 3 h crosslinking produces AA-3 with the highest absorption capacity (Q=11.20 g/g), reusability (up to 29 cycle), and re-absorption capacity (Q= 4.09 g/g). Surface modification through the addition of tannic acid and dodecanthiol was done to transform the hydrophilic AA-3 into more hydrophobic AA-3Do. The Fourier Transform Infrared (FTIR) data confirmed the incorporation of the additives in AA-3Do. The AA-3Do shown to very rapidly absorb diesel with the initial rate (R_0) of 1.12E+09 g/g.s but absorb water more gradually (R_0 = 27.6526 g/g.s) with 2 uptake equilibrium observed in its kinetic data. The pseudo second order kinetic and 2 steps linear driving force (LDF) model best described the diesel and water uptake, respectively. The study also explored the reusability and demonstrated the preference of AA-3Do for diesel uptake.

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