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首页> 外文学位 >Regenerable adsorbents for removal of arsenic from contaminated waters and synthesis and characterization of multifunctional magnetic nanoparticles for environmental and biomedical applications.
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Regenerable adsorbents for removal of arsenic from contaminated waters and synthesis and characterization of multifunctional magnetic nanoparticles for environmental and biomedical applications.

机译：可再生吸附剂，用于从污水中去除砷，以及用于环境和生物医学应用的多功能磁性纳米粒子的合成和表征。

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摘要

The present work is divided into two sections. The first section deals with the synthesis of regenerable adsorbents for the removal of arsenic from contaminated waters. An adsorbent based on carboxymethylated polyethylenimine grafted agarose gels was synthesized and characterized as a regenerable synthetic ferric oxide adsorbent with high capacity for arsenate ions at pH 3.0. Similarly, four metal ion chelating adsorbents based on dipicolylamine were synthesized and characterized with respect to their Cu(II), Fe(III) and As(V) adsorption capacities. The most efficient adsorbents were Nov-PEI-DPA and Nov-TREN-DPA. Additionally, a commercial ion exchange resin was modified with permanganate to oxidize arsenite into arsenate. A complete oxidation-adsorption system was proposed in which a column packed with the oxidation resin was connected in series with an adsorbent column composed of the polyethylenimine grafted agarose gels.;The second section involved work with magnetic nanoparticles. First, composite adsorbents consisting of magnetic particles encapsulated within agarose beads with and without grafted iminodiacetic acid (IDA) chelating groups were synthesized. The adsorption capacity of the adsorbents for Cu(II), Fe(III) and As(V) at different concentrations was investigated. Batch experiments were carried out to determine the Fe(III) and As(V) adsorption isotherms for the magnetic Novarose-IDA. Regenerability of the adsorbent was achieved with a pH change of the inlet solution, without affecting its magnetic or adsorption properties.;Magnetic composite particles were synthesized for biomedical applications. First, magnetic nanoparticles were coated with silica and then used for gold nanoshell production. These nanoshells were functionalized with a Brij S10 derivative, containing carboxylic groups, using dodecanethiol as a bridging agent to incorporate a fluorescent biomolecule.;Finally, magnetic and gold particles were encapsulated in PLGA nanoparticles. Docetaxel was loaded on these multifunctional nanoparticles and released studies were performed at 37°C. The presence of magnetite, colloidal gold and gold nanoshells in the PLGA nanoparticles was revealed by the coloration acquired by the polymeric nanoparticles. The release of drug from the polymeric nanoparticles showed a biphasic behavior with an initial burst followed by a prolonged slow release. There was no effect of the presence of magnetic or metallic particles on docetaxel release.
机译：本工作分为两部分。第一部分涉及可再生吸附剂的合成，用于从受污染的水中去除砷。合成了基于羧甲基化聚乙烯亚胺接枝琼脂糖凝胶的吸附剂，并将其表征为可再生的合成三氧化二铁吸附剂，在pH 3.0时具有高砷离子容量。同样，合成了四种基于二聚烯丙基胺的金属离子螯合吸附剂，并对其Cu（II），Fe（III）和As（V）的吸附能力进行了表征。最有效的吸附剂是Nov-PEI-DPA和Nov-TREN-DPA。另外，用高锰酸盐改性商业离子交换树脂以将亚砷酸盐氧化成砷酸盐。提出了一个完整的氧化吸附系统，该系统中填充有氧化树脂的色谱柱与由聚乙烯亚胺接枝的琼脂糖凝胶组成的吸附柱串联连接。第二部分涉及磁性纳米粒子的研究。首先，合成了由磁性颗粒组成的复合吸附剂，该磁性颗粒封装在带有和不带有接枝亚氨基二乙酸（IDA）螯合基团的琼脂糖小珠中。研究了不同浓度下吸附剂对Cu（II），Fe（III）和As（V）的吸附能力。进行批处理实验以确定磁性Novarose-IDA的Fe（III）和As（V）吸附等温线。吸附剂的可再生性是通过改变进口溶液的pH值来实现的，而不会影响其磁性或吸附性能。合成了磁性复合颗粒，用于生物医学应用。首先，磁性纳米颗粒涂有二氧化硅，然后用于金纳米壳的生产。使用十二烷硫醇作为桥联剂，并掺入荧光生物分子，用含有羧基的Brij S10衍生物对这些纳米壳进行功能化。最后，将磁性和金粒子封装在PLGA纳米粒子中。将多西他赛装载在这些多功能纳米颗粒上，并在37°C下进行释放的研究。 PLGA纳米粒子中磁铁矿，胶体金和金纳米壳的存在通过聚合物纳米粒子获得的着色得以揭示。药物从聚合物纳米颗粒中的释放显示出双相行为，其初始爆发是随后的缓慢释放。磁性或金属颗粒的存在对多西紫杉醇的释放没有影响。

著录项

  • 作者

    Verdugo Gonzalez, Brenda.;

  • 作者单位

    The University of Arizona.;

  • 授予单位 The University of Arizona.;
  • 学科 Engineering Chemical.;Nanotechnology.;Engineering Environmental.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 244 p.
  • 总页数 244
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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