fulltext.study @t Gmail

Photocatalytic and sonolytic oxidation of acid orange 7 in aqueous solution

Paper ID Volume ID Publish Year Pages File Format Full-Text
49133 46552 2006 10 PDF Available
Title
Photocatalytic and sonolytic oxidation of acid orange 7 in aqueous solution
Abstract

The oxidation of 50 mg/L azodye acid orange 7 (AO7) in water was investigated by means of photocatalysis in the presence of various semiconducting catalysts and ultrasound irradiation. The UVA-induced photocatalytic degradation over TiO2 anatase suspensions was found to increase with increasing catalyst concentration, decreasing solution pH, as well as in the presence of dissolved oxygen. The presence of 1,4-benzoquinone, sodium azide or sodium chloride in the reaction mixture decreased degradation due to the scavenging of radicals and other reactive moieties. Interestingly, addition of hydrogen peroxide at various concentrations from 21 to 1050 mg/L also inhibited degradation. The sonochemical degradation of AO7 was found to increase with increasing frequency and decreasing temperature. Under similar treatment conditions, ultrasound irradiation resulted in higher conversion than photocatalysis; moreover, the sonochemically irradiated solution consistently contained low aliphatic intermediates, while the photocatalytically treated solution mainly consisted of aromatic intermediates as confirmed by GC–MS analysis. The acute toxicity to marine bacteria V. fischeri decreased following oxidation with either process. Furthermore, deep sonochemical treatment slightly improved the aerobic biodegradability as assessed by shake flask tests.

Keywords
Acid orange 7; Intermediates; Photocatalysis; Toxicity; TiO2; Ultrasound; Wastewater
First Page Preview
Photocatalytic and sonolytic oxidation of acid orange 7 in aqueous solution
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 62, Issues 1–2, 10 January 2006, Pages 159–168
Authors
, , , , , ,
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