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Synthesis of Highly Dispersed Nanogold Catalyst and Various Metal Oxide Nanocrystals and Their Performance

Author: XiaHanMei
Tutor: FangYunJin
School: East China University of Science and Technology
Course: Chemical Engineering
Keywords: Nanomaterials Gold Nanoparticles Nanoreactor Cobalt oxide Calcium oxide
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 43
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Abstract


Nanomaterials concept since birth, caused widespread concern because of its unique nature and application prospects. This paper outlines the basic characteristics of nanomaterials, Preparation and Characterization of means. Nanomaterials mainly in the exploratory stage, this article focuses on the small size of the synthesis of new materials (nano-and micron) with performance testing, as well as their potential applications, the paper uses new methods to synthesize new nanomaterials and investigated their application. This article through the thiol group of the mesoporous silica functionalized, can be synthesized by a kind of highly dispersed gold nanoparticles to introduce the bore wall of the mesoporous silica (GMS) nanoreactor, provides a load in the carrier matrix precious metal or metal alloy, new methods and new ideas. The GMS has through its means of XRD, SEM, TEM, DRIFTS characterization synthesized uniform pore size of 5.6 nm, the specific surface area of ??up to 800 m2 / g. And GMS can exhibit excellent catalytic activity in the p-PNP and catalytic reduction of methylene blue. GMS catalytic reduction of the rate of reaction of p-PNP Knor-PNP = 45.9 mmol · s-1, and can stabilize the loop use. In the GMS catalytic reduction of methylene blue procedure, the catalyst can be reused after 10 activity decreased only by 6%, the repeated use 30 times activity after reduction amount is less than 18%. GMS highly ordered mesoporous structure and stable small-size gold nanoparticles is a catalyst to the main reason for having a high activity. Synthesized under different conditions of different particle size of the gold sol, TEOS (TEOS) as the silicon source parcel of gold nanoparticles prepared Au @ SiO2 nanospheres. Also utilize glucose under hydrothermal conditions condensation carbonation generation nano carbon spheres, and further wrapped with carbon ball of gold nanoparticles. Paper aerogels prepared the CaO Nanoplates (AP-CaO), and used for the adsorption of Congo red, were compared with commercial CaO (CM-CaO). Aerogels prepared by AP-CaO, specific surface area of ??up to 120 m2g-1, in the adsorption of Congo red, AP-CaO, and the maximum adsorption capacity of the CM-CaO up to 333.68 mg.g-1, 201.32 mg · g -1. The effects of the adsorption time, pH value, temperature, salt concentration of Congo Red adsorption. Through theoretical analysis, Langmuir adsorption isotherm model can describe CaO Congo red adsorption kinetic model pseudo-second-order kinetics. Sort by comparison of Congo Red adsorption effect of different metal oxides and mesoporous materials, AP-CaO has the largest adsorption capacity, and Congo red adsorption effect: of NiO lt; of Cr2O3 lt; MgO lt; CaO.

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