多孔性吸附介質的合成及其對重金屬吸附之研究; Synthesis and characterization of porous materials for the adsorption of toxic heavy metal ions

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Title:	多孔性吸附介質的合成及其對重金屬吸附之研究;Synthesis and characterization of porous materials for the adsorption of toxic heavy metal ions
Authors:	王盈婷;Ying-ting Wang
Contributors:	環境工程研究所
Keywords:	重金屬;吸附;表面特性;多孔性吸附介質;mesoporous materials;adsorption;heavy mental;surface characteristics
Date:	2009-06-25
Issue Date:	2009-09-21 12:19:27 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	由於具有結構整齊和一定孔徑分布，因此多孔性吸附介質可當作分子篩對環境中的汙染物進行吸附或催化，但受限於其孔徑大小多分布於微孔範圍，因此本研究自行合成多孔性吸附介質，以最具穩定性之水熱合成的方法，改變其合成條件，試圖改質多孔性吸附介質表面。控制有機模板合成條件、水熱合成條件、移除模板合成條件、過濾與乾燥方法合成條件、控制pH 合成條件等，將不同條件合成出的多孔性吸附介質進行儀器表面特性分析，探討不同變因對多孔性吸附介質合成之影響。並利用重金屬Cu2+、Pb2+、Ni2+進行吸附實驗。多孔性吸附介質合成實驗結果顯示，使用含碳鏈數越多的三甲基氨鹽作為模板，可使多孔性吸附介質比表面積變大、孔洞分佈較平均；相反的，若要得到較大的孔洞體積，可以選擇NTMA(NonylTrimethylAmmoniumBromide)作為模板合成多孔性吸附介質。水熱條件的時間與溫度均對合成多孔性吸附介質造成影響，水熱時間越長，可以使孔洞大小分布範圍拉大，但其表面積會明顯下降，水熱溫度越高，可讓其比表面積越大。移除模板溫度控制在500-7000C 範圍，結果顯示移除模板溫度越高，可得較大孔洞體積，但比表面積明顯變小。超過7000C 會使多孔性吸附介質結構崩解。使用透析膜和冷凍乾燥替代傳統抽氣過濾和烘箱乾燥，可以合成較大孔洞體積之多孔性吸附介質。控制pH=9-12 合成多孔性吸附介質，結果顯示在pH=9 可以合成出較大孔徑之多孔性吸附介質。實驗結果顯示控制pH=5 與等離子強度條件下進行吸附實驗，可得到較佳吸附效果。本實驗依不同條件所合成之多孔性吸附劑，由於其表面積的不同，使其吸附效果產生差異，明顯顯示表面積越大，對重金屬之飽和吸附量越大，多孔性吸附介質對Pb2+的吸附量也較Cu2+與Ni+佳。 Mesoporous materials have great potential for environmental processes,but many applications require the materials to exhibit specific surface chemistry and binding sites.The unique surface and pore structure of ordered mesoporous materials make them promising for applications in adsorption and catalysis.This study described the effective synthesis of mesoporous materials with uniform pore arrangement and high surface area for the adsorption of different metal ions such as Pb2+,Cu2+ and Ni+.This work involved synthesis of mesoporous materials using several template and hexadecytrimethylammoniumbromide(HDTMA) was found to be the effective template resulting into higher surface area and uniform small pore size.We also discuss the effect of preparation method and temperature to vary the pore size and surface area.To get the larger pore size,the calcination of removing the template at higher temperature is adopted.The mesoporous materials are characterized by FT-IR , XRD, SEM,TEM and BET.The XRD pattern indicates that the structure of porous materials is hexagonal.The characteristic peaks in FT-IR for Si-O is observed around 1082 cm-1 and for CH2 and CH3 is around 2805-2918 cm-1.The adsorption experiments of Pb2+,Cu2+ and Ni+ show that the adsorption capacity of Pb2+ is higher than that of Cu2+ and Ni+ indicating that the ion exchange property is mainly dependent on pore size distribution and surface area of the porous adsorbent materials.
Appears in Collections:	[Graduate Institute of Environmental Engineering ] Electronic Thesis & Dissertation

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