本研究主要探討利用聚乙烯醇(PVA)做為被覆劑，改質活性碳及奈米碳管，進而使用為吸附硼的效能。結果顯示，藉由聚乙烯醇(PVA)進行表面改質之活性碳和奈米碳管，對除硼的效率有顯著的增加。除此之外，動力學研究表明吸附現象可藉由擬一級和擬二級反應擬合。蘭米爾方程式(Langmuir equation)可以用來表示平衡吸附的現象。理論上，碳經由聚乙烯醇進行表面改質，吸附密度(q0)會因為聚乙烯醇的附著而降低。本研究觀察到，經由改質後的活性碳，其吸附密度顯著的降低，主要是由於活性碳間微孔隙的阻塞。然而，表面改質後的奈米碳管，其吸附密度無顯著的改變。研究結果也顯示出酸鹼值在吸附的過程中是一個重要的因素，在鹼性的條件之下有利於吸附的效率。在鹼性條件下，碳藉由聚乙烯醇改質後能增強吸附效率，主要機制是錯合物的形成、共價鍵、與氫鍵。

It has been reported that boron is toxic for plant even at low concentration. Thus, the appropriate method for boron removal needs to be discovered. Among technologies, adsorption is the commonly chosen process. In this study, two kinds of carbons, activated carbon (AC) and carbon nanotube (CNT), were used for boron adsorption. Polyvinyl alcohol (PVA) was used as impregnant for both AC and CNT to enhance the uptake capacity.

Significant enhancement was achieved after PVA modification for both modified AC and CNT. The adsorption of boron reached equilibrium within 24 hours. Furthermore, kinetic study showed that the adsorption could be fitted well by pseudo-first-order and pseudo- second-order. Langmuir equation was used to represent the equilibrium adsorption. Theoretically the adsorption density, q0, decreased after PVA modification due to the attachment of PVA. Significant decrease in q0 was only observed for activated carbon partly, due to pore blocking occurred in micropore area of AC. However, there was no significant decrease after PVA modification for CNT. pH was found to be the most significant factor for adsorption, and more favorable under alkaline condition. It was proposed that complex formation was the main mechanism to be responsible for significant enhancement on boron adsorption after PVA modification at basic condition.

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