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Degradation of DEP, P-nitroaniline and 4-nitrophenol by Photocatalysis and Associated with Fenton Method

Author: YangDan
Tutor: HuangWeiHong
School: Jiangsu University
Course: Environmental Engineering
Keywords: Photocatalytic Fenton Degradation Diethyl phthalate Nitroaniline Nitrophenol
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 205
Quote: 0
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Abstract


Photocatalytic technology and other advanced oxidation technology joint applied research in the field of the environment is a hot spot in recent years. Photocatalytic technology is a long time due to the presence of the reaction, the low efficiency of photocatalytic degradation, the technology is rarely applied in practical engineering; Fenton technology in water treatment contaminated with fast, simple equipment, no secondary pollution characteristics, but because oxidative degradation is insufficient, the amount of oxidant, the cost disadvantages of the technology in the actual project less alone. In this paper, the zero-valent iron class Fenton's reagent, Fenton reagent oxidation system photocatalytic technology coupled refractory organic wastewater treatment, mainly for the following research: (1) photocatalytic zero-valent iron class Fenton system orthophthalic the formic acid diethyl processing. Examines the main factors: pH, hydrogen peroxide amount, the amount of iron powder, the amount of catalyst, UV lamp power, temperature and phthalate diethyl initial concentration factors of diethyl phthalate degradation effect; through GC / MS techniques discussed their degradation mechanism. The results show that: in the the target solution pH is neutral, the photocatalytic zero-valent iron class Fenton technical joint 1h after treatment, diethyl phthalate degradation rate can reach more than 86%; iron and TiO2 reused three times , there are still more than 80% of the degradation rate; benzene ring structure is destroyed. (2) The photocatalytic zero-valent iron class Fenton system nitroaniline. The effects of the main factors: pH, hydrogen peroxide amount, the amount of iron powder, UV lamp power dosage of catalyst Ti02, temperature, methanol, on the nitroaniline initial concentration nitroaniline degradation effects; through GC / MS under acidic conditions, the degradation mechanism of the study. The results show that: the pH influence on the degradation effect, neutral or alkaline conditions, the is hardly degradation of p-nitroaniline; adjust the pH of the reaction solution 4:00 photocatalytic zero-valent iron class Fenton's reagent oxidation nitroaniline 14min up to more than 80% of the degradation rate; iron powder and Ti02 reused 3 times, still more than 60% of the degradation rate. (3) The photocatalytic Fenton system nitrophenol. Effects of main factors: pH, hydrogen peroxide amount, Fe2 volume, the amount of catalyst and nitrophenol initial concentration of nitrophenol degradation effects; degradation mechanism by GC / MS techniques, the degradation process The main product was hydroquinone, 4 - nitro-catechol, benzoquinone, etc..

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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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