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奈米樹狀高分子複合磁性金屬吸附貴重金屬之研究 = Dendrimer m...

國立高雄大學土木與環境工程學系碩士班

奈米樹狀高分子複合磁性金屬吸附貴重金屬之研究 = Dendrimer modified magnetic nanoparticles for adsorption of precious metals

Record Type:	Language materials, printed : monographic
Paralel Title:	Dendrimer modified magnetic nanoparticles for adsorption of precious metals
Author:	張俊祥,
Secondary Intellectual Responsibility:	國立高雄大學
Place of Publication:	[高雄市]
Published:	撰者;
Year of Publication:	民100
Description:	149面圖，表格 : 30公分;
Subject:	回收再利用
Subject:	reuse
Online resource:	http://handle.ncl.edu.tw/11296/ndltd/12104310983565849576
Notes:	參考書目：面117-123
Summary:	本研究目的為利用奈米樹狀高分子磁性複合金屬 (MNP-Gn, n 為樹狀高分子之世代)回收貴重金屬，探討其吸脫附效率，並測試其回收再利用及回收貴重金屬之可行性，提升其可利用性及回收效率。奈米樹狀高分子磁性複合金屬，能夠有效控制吸附金屬離子，透過磁選能將複合材料回收重複使用，只需要添加少量低濃度的酸(1% HCl)即可將貴重金屬脫附。本研究試驗主要分為三部份進行 : (1) 以MNP-G3 對水中貴重金屬進行等溫吸附試驗；(2) MNP-G3於貴重金屬與重金屬間之競爭吸附試驗； (3) 探討MNP-G3對吸附貴重金屬的選擇性。本研究以金、銀、鈀作為進行測試，試驗過程主要影響因子包括金屬種類與價數、世代、材料用量及pH值。由實驗結果發現，MNP-G3對貴重金屬的飽和吸附量分別為Pd4+約為36.9 mg/g，Au3+約為36.1 mg/g，Pd2+約為27.55 mg/g，Ag+約為 28.57 mg/g。在競爭吸附時，發現鋅離子存在時，會降低貴重金屬的吸附量；另外也發現競爭吸附時的所吸附的總莫耳數明顯優於單一離子吸附時的結果，由此可推估MNP-G3具有不同吸附能階的位址，以吸附不同價數之離子。在選擇性研究結果發現，pH值、溫度、EDTA添加都會對選擇性造成影響，而在pH6.5競爭吸附時，EDTA添加能增加複合材料對貴重金屬的選擇性，提升對貴重金屬的吸附量。 Adsorption of precious metals from wastewater using dendrimer modified magnetic nanoparticles (MNP-Gn, n represents different generations) was examined in batch reactors. In this study, the MNP-Gn was synthesized, characterized and examined as reusable adsorbents of precious mental. Parameters that may affect the adsorption such as the different metal ions, dendrimer generation, MNP-Gn loading and pH were evaluated. X-ray diffraction spectra showed that the MNPs were in the form of Fe3O4. The adsorption efficiency of precious metals increased with increasing pH. The adsorption data were ﬁtted wellbwith both Langmuir and Freundlich isotherms. The maximum adsorption capacity of precious metals for MNP-G3 determined by Langmuir model are 36.9 mg/g, 36.1 mg/g, 27.55 mg/g, and 28.57 mg/g for Pd4+, Au3+, Pd2+, and Ag+, respectively at pH 6.5 and 25 ℃. At pH less than 3, mental is readily desorbed. In addition, the MNP-Gn can be regenerated using the doluted HCl aqueous solution (1 %) where precious metals can be recovered in a concentrated form. It was found that the MNP-Gn underwent ten consecutive adsorption-desorption still retained the original removal capacity of precious metals. A competitive adsorption was observed when Zn2+ was added in the solution where the adsorption capacity of precious metals for MNP-G3 was significantly declined. In general, the selectivity of precious metals was still relatively low for MNP-G3; nevertheless, the use of chelating agents such as EDTA increased the selectivity of precious metals for MNP-G3.

奈米樹狀高分子複合磁性金屬吸附貴重金屬之研究 = Dendrimer modified magnetic nanoparticles for adsorption of precious metals
張, 俊祥

奈米樹狀高分子複合磁性金屬吸附貴重金屬之研究 = Dendrimer modified magnetic nanoparticles for adsorption of precious metals / 張俊祥撰 - [高雄市] : 撰者, 民100. - 149面 ; 圖，表格 ; 30公分.
參考書目：面117-123.
回收再利用reuse

奈米樹狀高分子複合磁性金屬吸附貴重金屬之研究 = Dendrimer modified magnetic nanoparticles for adsorption of precious metals
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330 $a 本研究目的為利用奈米樹狀高分子磁性複合金屬 (MNP-Gn, n 為樹狀高分子之世代)回收貴重金屬，探討其吸脫附效率，並測試其回收再利用及回收貴重金屬之可行性，提升其可利用性及回收效率。奈米樹狀高分子磁性複合金屬，能夠有效控制吸附金屬離子，透過磁選能將複合材料回收重複使用，只需要添加少量低濃度的酸(1% HCl)即可將貴重金屬脫附。本研究試驗主要分為三部份進行 : (1) 以MNP-G3 對水中貴重金屬進行等溫吸附試驗；(2) MNP-G3於貴重金屬與重金屬間之競爭吸附試驗； (3) 探討MNP-G3對吸附貴重金屬的選擇性。本研究以金、銀、鈀作為進行測試，試驗過程主要影響因子包括金屬種類與價數、世代、材料用量及pH值。由實驗結果發現，MNP-G3對貴重金屬的飽和吸附量分別為Pd4+約為36.9 mg/g，Au3+約為36.1 mg/g，Pd2+約為27.55 mg/g，Ag+約為 28.57 mg/g。在競爭吸附時，發現鋅離子存在時，會降低貴重金屬的吸附量；另外也發現競爭吸附時的所吸附的總莫耳數明顯優於單一離子吸附時的結果，由此可推估MNP-G3具有不同吸附能階的位址，以吸附不同價數之離子。在選擇性研究結果發現，pH值、溫度、EDTA添加都會對選擇性造成影響，而在pH6.5競爭吸附時，EDTA添加能增加複合材料對貴重金屬的選擇性，提升對貴重金屬的吸附量。 Adsorption of precious metals from wastewater using dendrimer modified magnetic nanoparticles (MNP-Gn, n represents different generations) was examined in batch reactors. In this study, the MNP-Gn was synthesized, characterized and examined as reusable adsorbents of precious mental. Parameters that may affect the adsorption such as the different metal ions, dendrimer generation, MNP-Gn loading and pH were evaluated. X-ray diffraction spectra showed that the MNPs were in the form of Fe3O4. The adsorption efficiency of precious metals increased with increasing pH. The adsorption data were ﬁtted wellbwith both Langmuir and Freundlich isotherms. The maximum adsorption capacity of precious metals for MNP-G3 determined by Langmuir model are 36.9 mg/g, 36.1 mg/g, 27.55 mg/g, and 28.57 mg/g for Pd4+, Au3+, Pd2+, and Ag+, respectively at pH 6.5 and 25 ℃. At pH less than 3, mental is readily desorbed. In addition, the MNP-Gn can be regenerated using the doluted HCl aqueous solution (1 %) where precious metals can be recovered in a concentrated form. It was found that the MNP-Gn underwent ten consecutive adsorption-desorption still retained the original removal capacity of precious metals. A competitive adsorption was observed when Zn2+ was added in the solution where the adsorption capacity of precious metals for MNP-G3 was significantly declined. In general, the selectivity of precious metals was still relatively low for MNP-G3; nevertheless, the use of chelating agents such as EDTA increased the selectivity of precious metals for MNP-G3.
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