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.

Details

Title
Radiation induced degradation of Congo red dye: a mechanistic study
Author
Muneer, Majid 1 ; Saeed, Muhammad 1 ; Ijaz Ahmad Bhatti 2 ; Haq, Atta-ul 1 ; Muhammad Kaleem Khosa 1 ; Muhammad Asghar Jamal 1 ; Saddaqat Ali 1 

 Department of ChemistryGovernment CollegeUniversity Faisalabad, Pakistan 
 Department of Chemistry, University of AgricultureFaisalabad, Pakistan 
Pages
49-53
Publication year
2019
Publication date
2019
Publisher
De Gruyter Poland
ISSN
00295922
e-ISSN
15085791
Source type
Scholarly Journal
Language of publication
Polish; Russian; English
ProQuest document ID
3157265313
Copyright
© 2019. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0 (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.