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Nanostructured assemblies for solid ...

Ca, Diep Vu.

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Nanostructured assemblies for solid phase extraction of metal ions.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nanostructured assemblies for solid phase extraction of metal ions./
作者:	Ca, Diep Vu.
面頁冊數:	231 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0247.
Contained By:	Dissertation Abstracts International66-01B.
標題:	Chemistry, Analytical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3159718
ISBN:	0496928155

Nanostructured assemblies for solid phase extraction of metal ions.
Ca, Diep Vu.

Nanostructured assemblies for solid phase extraction of metal ions. - 231 p.

Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0247.

Thesis (Ph.D.)--Miami University, 2005.

The main goal of our research was to develop nanostructured materials for (i) solid phase extraction of metal ions and (ii) electrocatalytic systems. The selective preconcentration of cesium from aqueous solutions containing high concentrations of alkali metals is an important problem in the treatment of radioactive waste. We investigated the use of cobalt hexacyanoferrate (CoHCF) for this purpose. The CoHCF in our work was encapsulated in a silica sol-gel material that is templated to have pores in the nano-domain. A capacity of 0.61 +/- 0.01 mmol Cs+ g-1 was achieved for the CoHCF-doped sonogel. The CoHCF silica sol-gels are promising both for the solid phase extraction of Cs+ and for the capture and storage of this cation. For environmental applications, after sorbing Cs + the glass-like material can be sintered to collapse the pores.

ISBN: 0496928155Subjects--Topical Terms:

586156
Chemistry, Analytical.

Nanostructured assemblies for solid phase extraction of metal ions.
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245 1 0 $a Nanostructured assemblies for solid phase extraction of metal ions.
300 $a 231 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-01, Section: B, page: 0247.
500 $a Director: James A. Cox.
502 $a Thesis (Ph.D.)--Miami University, 2005.
520 $a The main goal of our research was to develop nanostructured materials for (i) solid phase extraction of metal ions and (ii) electrocatalytic systems. The selective preconcentration of cesium from aqueous solutions containing high concentrations of alkali metals is an important problem in the treatment of radioactive waste. We investigated the use of cobalt hexacyanoferrate (CoHCF) for this purpose. The CoHCF in our work was encapsulated in a silica sol-gel material that is templated to have pores in the nano-domain. A capacity of 0.61 +/- 0.01 mmol Cs+ g-1 was achieved for the CoHCF-doped sonogel. The CoHCF silica sol-gels are promising both for the solid phase extraction of Cs+ and for the capture and storage of this cation. For environmental applications, after sorbing Cs + the glass-like material can be sintered to collapse the pores.
520 $a We found that silica sol-gel is not only a good hosting material but also a medium for growing crystals and extruding fibers. Here, a sonogel was used to grow CoSO4 and CuSO4 crystals and extrude Prussian Blue-containing fibers.
520 $a Subsequently, we investigated the use of mixed-ligand monolayer-protected gold nanoclusters (MPCs) with crown ether (CE) and carboxylate functionalities for the preconcentration of cesium from aqueous solution. 18-crown-6 ether was used as a functional group because it has a selective affinity to cesium. Here, the MPCs were used to assemble layer-by-layer (LBL) films on a substrate. The uptake of cesium from solution by these films was monitored by a quartz crystal microbalance. Our general interest was to modify electrode surfaces that can selectively interact with substances ranging from metal ions to biological models. We focused on the former as a surrogate. Thus, the study was developed for a metal ion, Pb2+ which is electrochemically active. In this case, 15-crown-5, which selectively complexes with Pb2+, was used instead of 18-crown-6. The electrostatic LBL films were assembled on gold and indium tin oxide (ITO) electrodes. Trapping Pb2+ within these nanostructured films was demonstrated by voltammetry and quartz crystal microbalance measurements.
520 $a Metal nanoparticles (NPs) can have different electrocatalytic properties from the corresponding bulk metal under given conditions. A hypothesis of our study was that NP catalysts can be optimized by controlling the distribution of metal NPs on an electrode surface. The oxidation of cysteine and arsenite were the test systems for AuNPs and PtNPs, respectively. Generation-4 poly(amidoamine)-encapsulated Au and Pt nanoparticles were synthesized. The metal-PAMAM NPs were assembled on an ITO electrode. The PAMAM was then decomposed by heating, leaving the NPs on the ITO. The surface excess, Gamma, of PAMAM-metal NPs was controlled. The catalytic oxidation of cysteine at the resulting AuNP array was observed. Interestingly, a study of the cyclic voltammetric peak current vs Gamma showed that a small amount of metal NPs dispersed on a surface electrode gave high electrocatalytic activities. For example, a mole fraction of Au-PAMAM in the assembled layer of 0.062 yielded the highest sensitivity. Linear calibration curves were obtained over the range 5 muM--500 muM for cysteine with AuNP catalysts. For AsIII with PtNPs, linearity was observed over the range 0.2 mM--1.0 mM.
590 $a School code: 0126.
650 4 $a Chemistry, Analytical. $3 586156
690 $a 0486
710 2 0 $a Miami University. $3 1017534
773 0 $t Dissertation Abstracts International $g 66-01B.
790 1 0 $a Cox, James A., $e advisor
790 $a 0126
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3159718