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Radiation induced degradation of Congo red dye: a mechanistic study Cover

Radiation induced degradation of Congo red dye: a mechanistic study

Open Access
|Apr 2019

Abstract

Synthetic dyes are persistent pollutants with poor biodegradability. The present study is about the degradation of direct Congo red dye in aqueous media using the Co-60 gamma radiation source. The experimental conditions such as gamma-ray absorbed doses, amount of oxidant (H2O2) and pH conditions were evaluated. The λmax of dye solution was noted as 498 nm, and then, decrease in absorbance and reduction in chemical oxygen demand (COD) were examined. The complete colour removal of dye was observed at 5 kGy, while a significant COD removal was observed at 15 kGy gamma-ray absorbed dose in conjunction with oxidant for 50 mg/L concentration. It was found that pH has no influence on degradation efficiency. A possible degradation pathway was proposed. The radiolytic end products were monitored by Fourier transform infrared (FTIR) and gas chromatography coupled with mass spectrometry (GC-MS) to explore the degradation mechanism. It was imperative to study the oxidative degradation pathway to provide directions for potential applicability of advanced oxidation process (AOP) in industrial wastewater treatment.

DOI: https://doi.org/10.2478/nuka-2019-0006 | Journal eISSN: 1508-5791 | Journal ISSN: 0029-5922
Language: English
Page range: 49 - 53
Submitted on: Apr 20, 2018
Accepted on: Mar 4, 2019
Published on: Apr 24, 2019
Published by: Institute of Nuclear Chemistry and Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 4 issues per year

© 2019 Majid Muneer, Muhammad Saeed, Ijaz Ahmad Bhatti, Atta-ul Haq, Muhammad Kaleem Khosa, Muhammad Asghar Jamal, Saddaqat Ali, published by Institute of Nuclear Chemistry and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.