fulltext.study @t Gmail

Acridine yellow as solar photocatalyst for enhancing biodegradability and eliminating ferulic acid as model pollutant

Paper ID Volume ID Publish Year Pages File Format Full-Text
48898 46526 2007 7 PDF Available
Title
Acridine yellow as solar photocatalyst for enhancing biodegradability and eliminating ferulic acid as model pollutant
Abstract

The possibility of using acridine yellow G (AYG) as solar photocatalyst for wastewater treatment has been examined in this paper. A phenolic compound, namely ferulic acid, has been employed as target pollutant. The effect of pH, concentration of the substrate and photocatalyst has been investigated. Control of pH is critical in the process, as rate constants obtained at pH 3 (k = 0.020 min−1) were one order of magnitude higher than in basic media (k = 0.002 min−1 at pH 9), due to differences in the absorption spectrum in the UVA–vis region. Under acidic conditions, 80% removal of the substrate was achieved after 3 h irradiation, although TOC decrease was moderate (around 20%). Nevertheless important detoxification of the solution was measured, and the remaining organic matter showed an enhanced biodegradability. For this reason, a combination of AYG-driven solar photocatalysis with biological treatment seems a good approach to deal with these effluents. Experimental data are consistent with an electron transfer mechanism between the excited photocatalyst and the substrate: involvement of hydroxyl radicals can be ruled out, and photophysical measurements indicate a quenching of the fluorescence of AYG in the presence of ferulic acid. The rate constant for this process was obtained from the Stern–Volmer equation (kq = 4.4 × 109 M−1 s−1). Finally, based on the Rehm–Weller equation, a ΔG = −22.8 kcal/mol was calculated, indicating that the process is thermodynamically favourable.

Keywords
Acridine yellow G; Ferulic acid; Photodegradation; Photocatalysis; Solar light; Oxidation; Fluorescence
First Page Preview
Acridine yellow as solar photocatalyst for enhancing biodegradability and eliminating ferulic acid as model pollutant
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 73, Issues 3–4, 11 May 2007, Pages 220–226
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