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Preparation and Photoelectric catalytic properties of CdS nanoparticles

Author: QiaoYaFen
Tutor: LiZuo
School: Nanjing Normal University
Course: Physical and chemical
Keywords: CdS Nanoparticles Reverse micelles Redox proteins Organic dyes
CLC: O614.242
Type: Master's thesis
Year: 2007
Downloads: 454
Quote: 3
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Abstract


CdS is an important Ⅱ - VI group semiconductor compound, at room temperature under the band gap energy of 2.42 eV, has a unique photovoltaic characteristics that have important uses in the light-emitting diodes, solar cells and optoelectronic components. Aroused widespread concern in recent years, a variety of preparation methods which came into being. Due to the different method of preparation, the particle size of the resulting nanoparticles, the particle size uniformity and phase structure is also different, thereby affecting their properties. This paper is mainly based on CdCl 2 · 2.5H 2 O, Na 2 S · 9H 2 O, is heptane, n-butanol and cetyl trimethyl ammonium bromide (CTAB) as raw material, ultrasonic CTAB / n-butanol / water / n-heptane reverse micelle system successfully fabricated CdS semiconductor nanoparticles. Using Fourier transform infrared spectroscopy (FT-IR), differential thermal - thermal (DTA-DTG) Modern structural analysis method to study it, the results obtained CdS nanoparticles surface modified CTAB. The surface modified CTAB role as follows: first, to prevent the the CdS nanoparticles reunion; Second, to increase the water solubility of CdS nanoparticles. The particles were characterized by high resolution transmission electron microscopy (TEM), to obtain an average particle size of 3-5nm; X-ray powder diffraction (XRD) analysis shows that the CdS for the face-centered cubic structure, i.e., β-CdS polymorph. UV-visible absorption spectroscopy (UV-vis) studies reactants CdCl 2 · 2.5H 2 the O of Na 2 S · 9H 2 O's of different proportions of the growth of nanoparticles, with the reduction of the amount of Na 2 S absorption spectra show strong blue shift, indicating that the CdS nanoparticles reduced. The CdS fluorescence spectra show that the fluorescence emission mainly exciton emission. Papers on model dye - photocatalytic degradation of methyl orange Experimental results show that the CdS nanoparticles showed high activity. CdS nanoparticles prepared by reverse micelle method as a photocatalyst, using visible light as a light source for photocatalytic degradation of methyl orange in aqueous solution. CdS photocatalysts dosage, the relationship and the mechanism of the initial concentration of methyl orange solution and pH decolorization rate, the results show that the of CdS photocatalysts agent methyl orange photocatalytic degradation good photocatalytic role. Light 8min methyl orange initial concentration of 20mg / L, amount of catalyst was 0.125 g / L, pH value 7.1, the methyl orange decolorization rate can reach 90% or more. Paper also CdS nanoparticles modified glassy carbon electrode electrochemical redox protein response and catalysis of hydrogen peroxide. The results show that: the CdS nanoparticles provide a favorable microenvironment for direct electron transfer between the protein and the electrode. In addition, the modified redox proteins out of the hydrogen peroxide reducing performance stability of biological catalytic activity. Its mechanism needs further study.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section II group metal element and its compounds > The zinc Vice family (Ⅱ B group metal elements ) > Cd Cd
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