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Biosorption of Heavy Metal Ions on Magnetotactic Bacteria and Mechanism of Nano-gold Preparation

Author: LiZuo
Tutor: SunJinSheng
School: Tianjin University
Course: Chemical Engineering
Keywords: Magnetotactic bacteria Heavy metal ions Biosorption Gold Nanoparticles
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 64
Quote: 0
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Abstract


Due to some Namijinte quantum size and macroscopic quantum tunneling effect and performance, in DNA identification and genetic medicine, nano-catalytic and other high-tech field of cutting-edge technology has broad application prospects. In this paper, the MSR-1 magnetotactic bacteria Biosorption of heavy metal ions adsorbed restore in-depth study of a single system, and the adsorption properties of the binary system. On this basis, the paper magnetotactic bacteria adsorption to restore the Gold Nanoparticles mechanism and environmental factors with gold nanoparticle morphology between the exploration the biosorption restore method of Gold Nanoparticles best conditions. Firstly MSR-1 magnetotactic bacteria of Cu to 2 All Ag Au 3 system of three single ion adsorption characteristics, including the impact of environmental factors, including pH, temperature, biomass, time and initial concentration were discussed and the adsorption isotherm and adsorption kinetics simulation, the regression model parameters. The research results show that the Langmuir model and pseudo second-order kinetic equation can describe magnetotactic bacteria the of Cu 2 Ag and the of Au 3 system of three single-ion adsorption isotherm and adsorption kinetics. MSR-1 magnetotactic bacteria on the Ag -Cu 2 and of Au , 3 -Cu 2 two yuan The adsorption characteristics of the system was studied. The results show that the presence of Cu 2 of can promote magnetotactic bacteria adsorption of Ag , Au 3 of magnetotactic bacteria in the presence of severe suppression Cu 2 adsorption, within a certain range, Cu 2 existence of magnetotactic bacteria can promote the adsorption of Au 3 of magnetotactic bacteria on The polyhydric system having selective adsorption characteristics. In addition, the use of the Langmuir model Ag -Cu 2 and of Au , 3 -Cu 2 binary systems isothermal adsorption process simulation, the corresponding model parameters, the results show that the Langmuir adsorption model can be a better description of the system Ag and the of Au 3 adsorption isotherm, obtained by fitting the Cu 2 adsorption expression. Finally, transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) and other advanced equipment for the experimental analysis means, MSR-1 magnetotactic bacteria Au 3 adsorption mechanism of reduction. The study found that the adsorption reduction process AuCl 3 · HCl → AuCl → Au 0 , and the pH value and solution Au 3 initial concentration of more hours the smaller the particle size is reduced to produce gold nanoparticles.

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