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Comparison of non-catalytic and catalytic ozonation processes of three different aqueous single dye solutions with respect to powder copper sulfide catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
42321 45920 2009 7 PDF Available
Title
Comparison of non-catalytic and catalytic ozonation processes of three different aqueous single dye solutions with respect to powder copper sulfide catalyst
Abstract

Treatment of textile wastewaters containing dyes has not been very successful by conventional methods such as biological treatment. In order to overcome this problem, ozonation based on the oxidation of organic pollutants has been studied by researchers. Catalytic ozonation and advanced oxidation processes (AOPs) are used in order to increase the efficiency of sole ozonation further. In this work, catalytic ozonation in the presence of copper sulfide (CuS) powder as a catalyst was investigated in the treatment of aqueous single dye solutions, namely solutions of Acid Red-151 (AR-151), Remazol Brilliant Blue-R (RBBR) and Reactive Black-5 (RB-5). In the catalytic ozonation experiments, the effects of important ozonation parameters such as solution pH, ozone and catalyst dosages and the initial concentration of each dye on reaction kinetics and mechanism were studied.The catalyst CuS increased the oxidation rates of ozonation side-products measured by the decrease in the total organic carbon (TOC) values of the treated dye solutions. The dye removal rates were enhanced in the treatment of RB-5 dye solutions, while no significant effects were observed on the dye removal rates of RBBR and AR-151 aqueous solutions. The TOC removals above 90% were observed in the catalytic ozonation with CuS for each of the dyes separately at pH 10 and at an initial dye concentration of 100 mg/L. The most important effect of the catalyst addition was observed at pH 3, where TOC removals without catalyst were low. Copper sulfide addition increased the percent TOC removals at the end of a reaction period of 80 min by 123%, 65% and 58% in the treatment of 100 mg/L RBBR, RB-5 and AR-151 aqueous solutions, respectively, at pH 3. Catalytic ozonation kinetics and mechanism were discussed in detail.

Graphical abstractCatalytic ozonation of single dye solutions of Acid Red-151, Remazol Brilliant Blue-R (RBBR), and Reactive Black-5 was investigated with CuS catalyst. Effects of pH, initial dye concentration, ozone and catalyst dosages on kinetics and mechanism of reactions were determined. Using scavenger decreased total organic carbon removal in catalytic ozonation, indicating importance of hydroxyl radicals in the oxidation process. Figure is for RBBR at pH 3.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Catalytic ozonation; Copper sulfide; Remazol Brilliant Blue-R (RBBR); Reactive Black-5 (RB-5); Acid Red-151 (AR-151); Advanced oxidation processes (AOPs)
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Comparison of non-catalytic and catalytic ozonation processes of three different aqueous single dye solutions with respect to powder copper sulfide catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 363, Issues 1–2, 1 July 2009, Pages 157–163
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