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The Study of Naphthalene Degradatrion Performance Using TiO2/Fe3O4-SiO2 Photocatalyst in Wastewater

Author: ZhouAiJuan
Tutor: ChenZhaoBo
School: Harbin Engineering University
Course: Environmental Engineering
Keywords: TiO2/Fe304-Si02 Wastewater containing naphthalene Response Surface Methodology Degradation pathways Photocatalyst
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 120
Quote: 1
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Abstract


Polycyclic aromatic hydrocarbons (PAHs) are a class of persistent toxic substances, teratogenic, carcinogenic, mutagenic three-induced toxicity, is currently known in the maximum amount of carcinogenicity of a single chemical species. The most water-soluble of PAHs - naphthalene as the raw material, naphthalene-based wastewater generated in the synthesis of phthalic anhydride, dyes, insecticides process, emissions from large, high concentrations of deep color, strong acid or alkaline , complex composition and other characteristics, are the typical toxic and hazardous refractory industrial wastewater. Research and development of such biodegradable organic pollutants processing technology has important significance of naphthalene production of organic intermediates. The Photocatalytic Oxidation deal with biodegradable naphthalene compound priority and focus on the direction of development. In recent years, nano-Ti02 as a novel environment functional materials are widely used in refractory wastewater treatment. However, due to the suspended Ti02 and wastewater separation difficulties, raising the cost of wastewater treatment. This thesis as a magnetic core stable superparamagnetic Fe304 nanoparticles application StOber method Fe304 nanoparticles coated in Si02, made to superparamagnetic magnetic Fe3O4-SiO2 carrier, bear in Fe3O4-SiO2 surface of the carrier by the sol - gel method Upload nano Ti02 catalyst, prepared monodisperse magnetic core - shell structure having in separable TiO2/Fe3O4-SiO2 (TFS) composite photocatalyst. By means of XRD, FTIR, TEM characterization of the TFS composite photocatalyst prepared under optimum conditions was analyzed, and confirmed that the preparation of a magnetic the nanoscale composite type separable Ti02 photocatalyst. In order to investigate the the TFS composite photocatalyst effect in degradation of pollutants, the paper selected polycyclic aromatic hydrocarbons representative pollutants - the naphthalene degradation test, and by central composite design of response surface methodology to optimize the experimental operating conditions, to determine the various experimental operating conditions on the order of naphthalene degradation rate, while numerical derivation, Matlab genetic algorithm three best method to obtain a more accurate parameter values, naphthalene degradation rate reaches the maximum value. The test results show that the the TFS composite photocatalyst having naphthyl efficient degradation ability, and an apparent reaction rate is fast. Photocatalytic naphthalene optimum operating conditions for the illumination time 97.1min, pH value of 2.1, composite catalyst dosage 96.2mg / L, naphthalene degradation rate optimization Under these conditions, up to 97.39%. Model validation, the model predictions and experimental values ??of the maximum relative error does not exceed 4%, indicating that the model has good predictive effect on the experimental results, the experiment has good guidance. GC-MS method for separation analysis the naphthyl photocatalytic degradation detected in the course of the reaction to 12 to determine an intermediate product and determined intermediates, and speculated that these compounds are able to explain the formation and conversion of the optical degradation pathway.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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