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Experimental Study of Treating Dye Wastewater by Non-Equilibrium Plasma Combined with Activated Carbon Fiber

Author: ZuoXiu
Tutor: ZhengJingTang
School: China University of Petroleum
Course: Chemical Engineering and Technology
Keywords: Non-equilibrium plasma Activated carbon fiber Hydrogen peroxide Ferric nitrate Synergy
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 68
Quote: 0
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Abstract


High voltage pulse discharge plasma technology is a set of non-equilibrium hydroxyl radical (· OH), hydrogen peroxide (H 2 O 2 ), ozone (O 3 < / sub>) and other active substances role in one of the advanced oxidation technology, because of its low energy consumption, high processing efficiency, responsive and non-selective, no secondary pollution and other advantages, making the technology has shown a good application prospect and great market potential. From the current research status quo, adsorption / catalyst reasonable choice is to limit the technological advantages into full play the main obstacles. In this thesis, the original research group non-equilibrium plasma discharge reactor has been improved, using methyl orange as model pollutant reactor investigated various process parameters on the degradation rate of methyl orange to determine the optimum process parameters, preliminary study of non-equilibrium plasma degradation mechanism of organic pollutants. Prepared by impregnation modified hydrogen peroxide and ferric nitrate modified modified modified two kinds of carbon fiber, the reaction to the non-equilibrium plasma modified activated carbon fibers were added investigated ACF with catalytic properties, explore the modified ACF and non-equilibrium plasma body synergy. High pressure needle electrode to the liquid phase and the gas phase to pulsed high voltage applied to the electrodes, the liquid phase H 2 O molecules under the impact of energetic electrons produced · OH, H 2 O 2 and other active substances, the gas phase O 2 molecules in the discharge electrode subjected to high energy electron collision excitation decomposition reaction produces O 3 Some O 3 by gas phase mass transfer to the liquid phase. Added to the discharge reaction H 2 O 2 , Fe 2 , the degradation rate of methyl orange and degradation efficiency are improved effectively, But there is no secondary pollution. Methyl orange in the gas-liquid two-phase simultaneously discharge reaction generates acid and aniline and other small molecules, these small molecules may eventually be · OH mineralized to H 2 O and CO 2 . Non-equilibrium plasma combined treatment with methyl orange modified ACF showed good synergy synergy generated mainly due to adsorption and catalysis modified ACF, ACF is a pollutant molecule concentration centers, in In and around the surface of the adjoining region to create a high concentration by adsorption environment, and ACF surface contaminant molecules are decomposed into the center. ACF peroxide modified acidic functional group to the surface of the discharge of active radical reaction, catalytic induce O 3 decomposition · OH, thereby increasing the degradation rate of methyl orange. ACF modified by ferric nitrate, surfactant point increase in secondary heat treatment after the ACF surface Fe 2 O 3 in the discharge reaction generates Fe 2 , O 2 and other substances, Fe 2 by means of photo-assisted Fenton reaction, O 2 by radical reaction can be further involved in generating · OH , O 3 and other active substances, helps to degradation of methyl orange.

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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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