磁性微胶囊的制备及其在酚类物质去除、检测方面的应用
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摘要
含酚废水是工业有机废水中最有代表性的一类,具有极强的生物毒性,是工业应用中需要重点解决的有害废水之一。本论文详细评述了含酚废水处理及其检测方面的研究进展,并对目前研究现状与存在的问题进行了评述,提出了本学位论文的选题指导思想,并开展了如下的工作。
     1)采用相分离技术成功制备了磷酸三丁酯/四氧化三铁-聚砜微胶囊,并用于去除水溶液中对氯苯酚(4-CP)、邻氯苯酚(2-CP)、对硝基苯酚(4-NP)和苯酚(Ph)的研究。实验结果显示,磷酸三丁酯/四氧化三铁-聚砜微胶囊对这四种酚类化合物的吸附速率很快,尤其是在前5 min,可以达到最大吸附量的90%,30 min基本上可以达到吸附平衡。并且通过工业化可行性应用研究,可以看出,在含酚类废水中加入一定量的磷酸三丁酯/四氧化三铁-聚砜微胶囊,论文所研究的酚类化合物可以被去除并达到排放标准,说明微胶囊有潜在的工业应用价值。
     2)本工作仍采用相分离技术成功制备了有机蒙脱土/四氧化三铁-聚砜微胶囊和C18/四氧化三铁-聚砜微胶囊。并对两种微胶囊在吸附4-CP和2-CP方面做了相应的比较,发现无论是吸附量还是吸附速率,有机蒙脱土/四氧化三铁-聚砜微胶囊都要优于C18/四氧化三铁-聚砜微胶囊。所以选择有机蒙脱土/四氧化三铁-聚砜微胶囊作为固相萃取材料,与HPLC联用检测水溶液中的4-CP和2-CP。实验结果显示,所建立的研究方法能够满足水质分析的要求。
     本论文共分为三个部分:
     第一章:评述了酚类化合物对水资源所造成的污染,并综述了含酚废水目前常用的处理以及检测方法,并且提出了本论文的指导思想。
     第二章:采用相分离技术成功制备了磷酸三丁酯/四氧化三铁-聚砜微胶囊,并用于去除水溶液中4-CP、2-CP、2-NP和Ph的研究。
     第三章:本工作仍采用相分离技术制备了有机蒙脱土/四氧化三铁-聚砜微胶囊和C18/四氧化三铁-聚砜微胶囊。并选用有机蒙脱土/四氧化三铁-聚砜微胶囊作为固相萃取材料,与HPLC联用检测水溶液中的4-CP和2-CP。
Phenolic wastewater is one of the representative wastewater, which is difficult to treat in industry. This dissertation reviews the methods of phenolic wastewater treatment, the phenolic wastewater detection and present problems in detail, and then propose the topics of this dissertation. The following major innovation works were carried out based on the previous literatures:
     1) Magnetic microcapsules containing tributyl phosphate (TBP) have been prepared successfully with a phase inversion method, and the adsorption of phenols from aqueous solution using TBP/Fe3O4@PSF (polysulfone) microcapsules has been studied. The results showed that it took about 30 min to reach extraction equilibrium with most of phenols being adsorbed within the first five minutes. The investigation of potential industrial application provided encouraging results for the application of these magnetic microcapsules to the adsorption of phenols from aqueous solutions in large-scale operations.
     2) Magnetic organic modified montmorillonite (OMMT)/Fe3O4@PSF microcapsules and C18/Fe3O4@PSF microcapsules were synthesized, the materials were applied for cleanup and enrichment of 4-CP and 2-CP. Comparative studies were carried out between OMMT/Fe3O4@PSF microcapsules and C18/Fe3O4@PSF microcapsules. Either adsorption or absorption rate, OMMT/Fe3O4@PSF microcapsules are superior to C18/Fe3O4@PSF microcapsules. So, we chose OMMT/Fe3O4@PSF microcapsules as magnetic solid phase extraction, established the measure method of 4-CP and 2-CP enrichment by magnetic solid phase extraction (MSPE) from water followed by HPLC determination. The experimental results showed that the established methods met the requirements of water quality analysis.
     Three parts are included in the dissertation
     Chapter I:Review of the phenolic compounds in water pollution, and the commonly used phenolic wastewater treatment and detection, and then proposed topics of this dissertation.
     Chapter II:Magnetic microcapsules containing TBP have been prepared successfully with a phase inversion method, and the removal of phenols from aqueous solution using TBP/Fe3O4@PSF microcapsules has been studied here.
     Chapter III:Magnetic OMMT/Fe3O4@PSF microcapsules and C18/Fe3O4@PSF microcapsules were synthesized with a phase inversion method too, we chose OMMT/Fe3O4@PSF microcapsules as magnetic solid phase extraction, established the measure method of 4-CP and 2-CP enrichment by MSPE from water followed by HPLC determination.
引文
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