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Imidazole and pyridine degradation of ionic liquids

Author: ChangZuo
Tutor: LiChunXi
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: Ionic liquids Imidazole Pyridine Biodegradability Degradation products Photocatalytic
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 443
Quote: 7
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Abstract


Ionic liquid is an organic cation and an inorganic or organic anion room temperature molten salt. Because of its low vapor pressure, good thermal stability, a wide range of dissolution, etc., are considered to be an alternative to the conventional organic solvent, \Currently, the environmental impact of ionic liquids research focuses on the biological systems of different ionic liquids toxic influence on the biodegradability of ionic liquids research less. This paper selected five kinds of common imidazolium ionic liquids as well as three kinds of pyridine-based ionic liquids as the research object, using the activated sludge method and the method of photocatalytic degradation of these ionic liquids. The main contents include the following three parts: (1) study five imidazolium ionic liquids biodegradability, including one - butyl - 3 - methylimidazolium chloride salt, 1 - butyl - 3 - methylimidazolium tetrafluoroborate borate salt, 1 - butyl - 3 - methylimidazolium hexafluorophosphate, 1 - hexyl-3 - methylimidazolium chloride, and 1 - octyl-3 - methylimidazolium chloride. Mainly studied the acclimatization period, the concentration of ionic liquid, the side chain length and the anions of ionic liquids of biodegradability, and analyzed methylbutyl imidazolium possible degradation products and degradation pathways. Where 1 - butyl - 3 - methylimidazolium chloride salt, 1 - butyl - 3 - methylimidazolium tetrafluoroborate, and 1 - butyl - 3 - methylimidazolium hexafluorophosphate can partially degraded, the degradation rate increased successively; while one - hexyl-3 - methylimidazolium chloride, and 1 - octyl-3 - methylimidazolium chloride can not easily be biodegradable. (2) of three kinds of alkyl pyridines biodegradable ionic liquid, including N-butyl-pyridine chloride, N-hexyl pyridinium chloride and N-octyl pyridine chloride. By HPLC-MS method for determination of degradation products cation. Research shows that, N-butyl pyridine chloride than N-hexyl chloride easier pyridine degradation, and pyridine N-octyl chloride readily biodegradable. N-butyl chloride and pyridine N-hexyl chloride pyridine degradation process with zero order kinetics equation. Pyridine cations include alkyl terminal degradation of the carbon chain and the pyridine ring opening oxidation of ethylene process, the intermediate product is eventually converted to NH4, CO2 and H2O. N-butyl-pyridine chloride initial concentration of 300 mg / L, the degradation of up to 24 hours COD removal efficiency of 92.5%. (3) using p25 nanometer TiO2 photocatalysis and biodegradation combination of methods to study three 1,3 - dialkyl imidazolium chloride ionic liquid degradation process, and identified by HPLC-MS method for photocatalytic degradation of debris and possible structure. The results show that: under the same conditions, all three ionic liquids photocatalytic degradation rate of the order of 1 - butyl - 3 - methylimidazolium chloride [BMIM] Cl gt; 1 - hexyl-3 - methyl-imidazolium chloride [HMIM ] Cl ≈ 1 - octyl 3 - methylimidazolium chloride [OMIM] Cl. [BMIM] Cl photocatalytic degradation process in line with a kinetic equation, the best catalyst was 0.5g / L. HPLC-MS analysis showed that the photocatalytic degradation of imidazole open epoxidation process of generating a plurality of partial oxidation of fragments. Photocatalytic aqueous ionic liquid pretreatment can improve its subsequent biodegradability of activated sludge.

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