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Ultrasonic under sodium aluminate structure change in the nature of the research

Author: ZhangMuQun
Tutor: YinZhouLan
School: Central South University
Course: Physical and chemical
Keywords: Ultrasonic wave Radicals Sodium aluminate solution Quantum chemistry
CLC: O614
Type: Master's thesis
Year: 2004
Downloads: 119
Quote: 2
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Abstract


The research applied the relevant modern analytical tools and quantum chemical calculations, the first systematic study of the mechanism of the ultrasonic enhancement of sodium aluminate solution decomposition. Through the application of electron spin resonance techniques, spectrophotometry, the sonoluminescence fluorescence imaging technology, and fluorescence spectroscopy detection and analysis of the production of free radicals and related features in the the ultrasound induced sodium aluminate solution; Raman spectroscopy and Raman quantitative analysis supersaturated medium structural changes in the nature of the concentration of sodium aluminate solution under ultrasonic system. Induced free radicals generated based on the structural properties of the solution and ultrasound, the application of quantum chemical calculations and statistical thermodynamic theory, the first systematic study of ultrasound under the law of a variety of the aluminate ion balance and transformation, explore the ultrasound enhanced supersaturated medium concentration decomposition of sodium aluminate solution possible reaction pathways. The paper mainly achieved the following results: 1 for the first time application of free radicals catch method and electron spin resonance techniques to analyze and detect free radicals generated by the sodium aluminate solution under ultrasonic cavitation. The experimental results show that: when the ultrasound output power reaches or exceeds the cavitation threshold the supersaturated medium concentration of sodium aluminate solution water molecules can be cleaved into hydroxyl radicals and hydrogen atoms radical. And the production of free radicals and ultrasonic output power, ultrasonic time and solution concentration. 2 respectively, using alizarin violet spectrophotometry, the sonoluminescence fluorescence imaging technology, fluorescence spectroscopy to study the free radicals generated by ultrasonic aqueous solution of sodium aluminate solution. Through these indirect methods of analysis of free radical production, for the first time to explore the the ultrasonic induced radical nature. Combined with previous results, the application of Raman spectroscopy and Raman quantitative analysis methods, the first analysis of ultrasound supersaturated medium concentration sodium aluminate solution structure of nature. The structural changes in the nature of the solution of each ion, the solution under ultrasonic monomer aluminate ion, Al (OH) 4 concentration was reduced, dimer ion (OH) 3 Al-(OH) 2 -Al (OH) 3 2 - concentration increased. 4 using quantum chemistry calculation method to calculate the sodium aluminate solution in all kinds of substances that may be present. Nature, the total energy geometry optimization using the DFT / BLPY method analyzes ions, vibration frequency. COSMO solvent model as well as the applied electrostatic field method, the calculation of ion solvation effect. According to the calculated results and the experimental results, the mutual conversion between the ion thermodynamic analysis and ultrasound strengthen the microscopic mechanism of the decomposition of sodium aluminate solution was first proposed.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds
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