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Photodecolourization of orange II with iron corrosion products and oxalic acid in aqueous solution

Paper ID Volume ID Publish Year Pages File Format Full-Text
41182 45879 2012 6 PDF Available
Title
Photodecolourization of orange II with iron corrosion products and oxalic acid in aqueous solution
Abstract

Iron corrosion products (ICPs) were tested as heterogeneous catalysts to decolourize orange II (OII) in the presence of oxalic acid under simulated natural light or solar light. ICPs were collected from the cast iron pipes used in a wastewater treatment plant, and characterized with energy dispersive X-ray spectroscopy (EDS), X-ray powder diffraction (XRD) and N2 adsorption/desorption isotherm analyses. The photodecolourization efficiency depends significantly on various factors including the ICPs dosage, initial concentration of oxalic acid and the initial pH value. Under the optimal conditions (ICPs dosage 0.40 g/L, initial concentration of oxalic acid 1.6 mM and pH 3.0), the photodecolourization efficiency for a solution of 25 mL containing 10 mg/L OII reaches 83% and 44%, respectively, under simulated natural light (I = 14 mW/cm2) and solar light (I = 1.2 mW/cm2) for 30 min. Tartaric or citric acid is also efficient for ICPs to photodecolourize OII under simulated natural light. Since this system directly uses ICPs as heterogeneous catalysts and does not require the addition of hydrogen peroxide and shows good efficiency even under solar light, it is an economically viable method for decolourization of wastewaters containing dyes.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (71 K)Download as PowerPoint slideHighlights► Iron corrosion products were evaluated as heterogeneous catalysts. ► An economically viable system for decolourization of orange II was developed. ► Factors affecting decolourization efficiency for this system were examined.

Keywords
Iron corrosion products; Iron oxides; Oxalic acid; Photo-Fenton-like system; Photodecolourization; Orange II
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 417–418, 29 February 2012, Pages 253–258
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