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Photodegradation of the anthraquinonic dye Acid Green 25 by TiO2 immobilized on carbonized avocado kernels: Intermediates and toxicity

Paper ID Volume ID Publish Year Pages File Format Full-Text
45716 46421 2015 10 PDF Available
Title
Photodegradation of the anthraquinonic dye Acid Green 25 by TiO2 immobilized on carbonized avocado kernels: Intermediates and toxicity
Abstract

•Avocado carbon impregnated in glycerol with a TiO2 sol produced anatase composite.•The composite demonstrated degradation efficiency with solar light.•Hydroxylated methylbenzenesulfonates identified by LC–MS as products of Acid Green 25.•Amino-5-methylbenzenesulfonate and anthraquinone derivatives present among products.•No toxic effects of the dye AG25 and its photo-products on Azospirillum brasilense.

The aim of this research was to develop a TiO2 composite from a waste material in order to study the photocatalytic decomposition of an important residual anthraquinonic dye. Carbon-TiO2 composites were obtained from carbonized avocado kernels and sols of TiO2 prepared from NH4OH and TiCl4 using glycerol as a binder and thermally treating the composites at 500 °C. XRD studies confirmed the anatase phase of TiO2. SEM images showed isolated TiO2 agglomerates attached on the carbon surface with a Ti:C ratio of 1:3.3 established by EDS semi-quantitative analysis. The photocatalytic activities of the prepared composites were tested in a decomposition assay of Acid Green 25. Titanium dioxide and the composite eliminated almost 100% of the dye under UV irradiation and the composite demonstrated degradation efficiency under solar light. The reaction was monitored by UV–vis spectrophotometry and by LC-ESI-(Qq)-TOF-MS-DAD, enabling the identification of some intermediate species. No evidence of toxic effects was found in the dye AG25 and its photodegradation products, which were evaluated on the plant growth-promoting bacteria Azospirillum brasilense.

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Keywords
TiO2/carbon composite; Acid Green 25; Photocatalysis; Solar irradiation; Product identification; Toxicity
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Photodegradation of the anthraquinonic dye Acid Green 25 by TiO2 immobilized on carbonized avocado kernels: Intermediates and toxicity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 166–167, May 2015, Pages 241–250
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