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Application of an active immobilized iron oxide with catalytic H2O2 for the mineralization of phenol in a batch photo-fluidized bed reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
42782 45941 2009 7 PDF Available
Title
Application of an active immobilized iron oxide with catalytic H2O2 for the mineralization of phenol in a batch photo-fluidized bed reactor
Abstract

A batch photo-fluidized bed reactor (photo-FBR) is designed for the mineralization of phenol and the minimization of iron species leached from an active immobilized iron oxide (denoted as SiG2). The hydroxyl radical (OH), which is produced from the reaction of hydrogen peroxide (H2O2) and SiG2 under irradiation by a 400-W Hg-vapor lamp, was confirmed by electron paramagnetic resonance signals of 5,5-DIMETHYL-1-pyrroline-N-oxide (DMPO)-OH (aqueous solution). The mineralization of phenol was more efficient in the presence of light. In general, a decrease of solution pH is commonly ascribed to the formation of carboxylic acids (acetic acid, oxalic acid, formic acid etc.) during the degradation of phenol. However, in this study, an interesting phenomenon was observed. The solution pH first decreased and then rose during the reaction in the presence of light. Also, in this case, the variation of solution pH reflected the degree of mineralization in this study. The approximately 98% mineralization of phenol led to fewer iron species being leached from SiG2 in the photo-FBR. A savings of more than 40% of the H2O2 dosage required for the phenol mineralization process was confirmed. In a batch photo-FBR, the system loading reflects the ratio of catalyst weight to the reaction volume. About 96%, 86% and 11% of the total organic carbons were removed after 180 min, resulting in catalyst weight to reaction volume ratios of 30:1, 20:1 and 13:1, respectively. The activity of SiG2 did not decline after six reactions. The reactions for photo-assisted SiG2 in the presence of hydrogen peroxide and phenol were summarized.

Graphical abstractA water-fluidized type photo-reactor is designed to mineralize phenol and to avoid the resulting iron species being leached from the surface of the iron oxide. The advantages of this photo-reactor are as follows: (1) it is easier to carry larger and heavier solids than air-suspended type photo-reactor; (2) it is easy to control temperature; (3) the water-fluidized type photo-reactor does not lead to foam in the presence of phenol.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Photo-Fenton; Iron oxide; Mineralization; Phenol; Fluidized bed reactor
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Application of an active immobilized iron oxide with catalytic H2O2 for the mineralization of phenol in a batch photo-fluidized bed reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 357, Issue 2, 15 April 2009, Pages 135–141
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us