結合物理化學改質方法以提高農業剩餘資材產製的生物炭吸附氨氮能力之研究

Combined Physicochemical Modification to Enhance Ammonium Adsorption Capacity of Biochar Prepared from Agricultural Residues

阮碧雲(Bich-Van Nguyen)

指導教授 ： 蔡勇斌

國立暨南國際大學/科技學院/土木工程學系/碩士(2022年)

https://doi.org/10.6837/ncnu202200211

摘要

在水和廢水中，高濃度的氨存在於農田中為常見的活性氮 (N) 形式，其毒性對農業永續性和人類健康構成巨大威脅，因此應予以去除。在此研究中，選用農業剩餘資材包含茭白筍殼和香蕉皮來製作生物炭，用於水環境中的氨處理。過氧化氫 (H2O2) 用於氧化生物炭材料，再結合球磨技術以提高氨的吸附能力。較低的熱解溫度和較長的過氧化氫氧化時間，有助於提升茭白筍殼和香蕉皮生物炭的氨去除效率。經球磨與氧化處理的茭白筍殼生物炭 (Ba-OW) 與香蕉皮生物炭 (Ba-OB) 的最大氨吸附量 (Qmax) 分別為11.64 mg/g和9.03 mg/g。氨吸附過程符合Langmuir等溫吸附模式，亦符合擬二階動力模式，相關係數高 (R2 > 0.93)。此外，改質的生物炭在廣泛的溫度、溶液pH、吸附劑用量範圍和共存正離子的存在下，具良好氨吸附容量潛力。本研究亦證實氧化處理的生物炭 (OBCs) 和球磨處理的生物炭 (Ba-OBCs) 在吸附氨氮後，均具有釋放氨氮能力，適合先吸附去除水中氨氮後，再回歸農田做為含N-K的緩速釋型肥料，以促進植物生長，並減少化肥使用。

關鍵字

生物炭 ； 銨鹽 ； 茭白筍殼 ； 香蕉皮 ； 氧化 ； 球磨

並列摘要

In water and wastewater, high levels of ammonium, a common form of reactive nitrogen (N) in farmland pose a great threat to sustainable agriculture and human health, and it should be eliminated due to its toxicity. In this study, the agricultural residues involving water bamboo husks and banana peels were utilized to produce biochar for ammonium treatment in the aqueous environment. Hydrogen peroxide (H2O2) was used to apply for the production of oxidized materials and then combined with ball-milling technique to enhance ammonium adsorption capacity. The low pyrolysis temperature with a longer oxidation time was more favorable for the ammonium removal efficiency of water bamboo husks and banana peels feedstocks. The maximum ammonium capacity (Qmax) of Ba-OW and Ba-OB achieved were 11.64 mg/g and 9.03 mg/g, respectively. The ammonium adsorption process fitted well the Langmuir isotherm and the pseudo-second kinetic models with high correlation coefficiency (R2 > 0.93). Additionally, modified BCs showed the great potential of ammonium adsorption capacity under a wide range of temperatures, pH solutions, the dosage of adsorbents, and the presence of co-existing positive ions. The proven ability of ammonium release of OBCs and Ba-OBCs made them promising adsorbents to be promoted as N-K-laden slow-fertilizer for plant growth.

並列關鍵字

biochar ； ammonia ； water bamboo husk ； banana peel ； oxidation ； ball-milling

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