吸附去除水中銻之研究

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Title:	吸附去除水中銻之研究
Other Titles:	Removal of antimony from water by adsorption process
Authors:	徐嘉欣;Hsu, Chia-Hsin
Contributors:	淡江大學水資源及環境工程學系碩士班康世芳;Kang, Shyh-Fang
Keywords:	吸附;粒狀氫氧化鐵;等溫吸附模式;銻;競爭離子;Antimony;granular ferric hydroxide;adsorption;Freundlich isotherm;competitive anions
Date:	2012
Issue Date:	2013-04-13 12:04:36 (UTC+8)
Abstract:	吸附法為淨水程序中去除重金屬常見方法之一，本研究以吸附去除水中銻，吸附操作參數為吸附劑種類(粒狀活性碳、粒狀氫氧化鐵、錳砂)、接觸時間、吸附劑加藥量、初始濃度、pH、銻價數(Sb(Ⅲ)與Sb(Ⅴ))及共同離子(硝酸鹽、硫酸鹽、磷酸鹽)，進行等溫吸附實驗與動力吸附實驗，結果分別以Freundlich與Langmuir等溫吸附公式與Lagergern速率公式分析，探討吸附去除水中銻之效率。研究結果指出吸附劑去除Sb之效果依序為粒狀氫氧化鐵>錳砂>粉末活性碳，GFH吸附Sb之吸附量分別為PAC與錳砂的12倍與5倍，吸附Sb(V)之吸附量分別為PAC與錳砂的20倍與14倍。GFH吸附Sb之最適pH範圍為3~8，GFH對Sb(III)吸附量為Sb(V)吸附量之2.8倍。在相同濃度GFH下，Sb初始濃度越高則Sb吸附量越大。共離子競爭方面，硝酸鹽對Sb(III)之吸附影響不大，硫酸鹽會稍微影響Sb(III)之吸附，而磷酸鹽則是會大幅抑制Sb(III)之吸附，磷酸鹽對Sb(V)吸附之影響亦是如此。在等溫動力吸附模式上，Freundlich等溫吸附式較Langmuir等溫吸附式適用於說明GFH吸附Sb，Freundlich等溫吸附式之n值隨Sb初始濃度增加而增加，且Sb(III)之n值大於Sb(V)之n值。GFH吸附銻之動力可遵循擬二階(Pseudo-second-order)動力與孔隙擴散模式(intraparticle diffusion model)。 This research evaluated the capability of adsorbed Sb(III) and Sb(V) by three various adsorbents. The effects to the adsorption of Sb(III) and Sb(V) resulting from the type and dosage of adsorbents, reaction time, pH, initial Sb concentration, and competitive anions were investigated. Kinetic studies suggested that the adsorption equilibriums for both Sb(III) and Sb(V) were reached within 24 h. The results show that the order of adsorption efficiency by different adsorbent is GFH>Mnz>PAC and the efficiency of GFH is 23 times better than PAC. The amount of Sb(III) been adsorbed by GFH is 2.9 times larger than Sb(V) due to the chemical formation of Sb(OH)3 and Sb(OH)6- respectively. The optimum pH for adsorption of Sb ranged from 3 to 8 and can reach more than 85% removal efficiency. In the pH range from 8 to 10, the adsorption of Sb by GFH decreased with increasing pH. PAC is not suitable as an adsorbent for adsorption of Sb while GFH is accessible. When the dosage of GFH is fixed, the adsorption efficiency of Sb increased with increasing of initial concentration of Sb. The Freundlich isotherm model could better describe the phenomena of Sb adsorption by GFH than Langmuir model. The n value in Freundlich model increased with increasing initial concentration of Sb and n value of Sb(III) is larger than Sb(V)’s. The best fit kinetic models of modeling adsorption of Sb by GFH are pseudo-second-order model and intraparticle diffusion model. Keywords: antimony, granular ferric hydroxide, adsorption, competitive anions, Freundlich isotherm
Appears in Collections:	[Graduate Institute & Department of Water Resources and Environmental Engineering] Thesis

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