The studies on functional modification of zeolitic imidazolated framework-90 (ZIF-90) and mesoporous silica (SBA-15) materials
| Autor: | Jhe-Wei Wu, 吳哲瑋 |
|---|---|
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 Two parts in my thesis. Part I, a straightforward method was developed for the conversion ZIF-90 aldehyde groups into amino and carboxyl groups to change the ZIF surface into cationic and anionic, respectively, under neutral conditions. A detailed characterization of the samples performed using different spectroscopic techniques unanimously demonstrated the ZIFs. Accordingly, the transformations proceeded without loss of integrity of the parent framework. Remarkably, ZIF-90-A showed with great CO2 binding capability, so it is good potential material for CO2 storage. In addition, we also have demonstrated the potential of use the ZIFs modified with amino groups for polynucleic acid separation by DNA plasmid binding assays. It opens a new way for the application of ZIF materials in biomaterials separation or delivery. Part II, a general synthetic method for functionalization of mesoporous silica with amino acid has been developed. The carboxylic acid functionalized SBA-15 were conjugated with L-phenylalanine (Phe) and L-tryptophan (Trp) to obtain nontoxic amino acid-conjugated functionalized mesoporous silica materials. The materials were used as adsorbents for the removal of the herbicide Paraquat (PQ) and its analog, ethyl viologen dibromide (EVB) from aqueous solutions. In comparison to the commercially activated carbon adsorbents, the silica-based adsorbents prepared in this study exhibited relatively higher PQ removal efficiency at room temperature and pH 7.0. This bioconjugated method developed here provides a promising new tool to synthesize new materials for detoxification of herbicides in clinical trials. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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