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Title: Alternate use of sulphur rich coals as solar photo-Fenton agent for degradation of toxic azo dyes
Authors: Shaida M.A.
Sen A.K.
Dutta, Raj Kumar
Published in: Journal of Cleaner Production
Abstract: Low grade coals with high sulphur contents are not suitable as fuels in thermal power plants due to generation of high ash content and emission of toxic sulphur oxide gases. Here we have demonstrated an alternate use of pyrite rich coal as a source for sustainable generation of hydrogen peroxide and hydroxyl radicals in aqueous medium via solar light induced photo-Fenton process which were utilized for degradation of toxic azo-dyes. The textural, compositional and morphological features of pristine pyritic coals with varying sulphur concentrations are studied by an array of characterization techniques. The dye degradation capacities of pyrite rich coal are studied using model dye solutions e.g., Basic Blue 41 containing single azo group per unit and Trypan Blue containing two azo groups per unit. The rate of degradation (k) is faster for Basic Blue-41 (0.0192 min?1, ?99% degradation) at optimized solar radiation exposure time, pH 6 and dose of 1 g/L pyritic coal. The dye degradation is presented as a measure of solar radiation accumulation energy per unit volume, and it is attributed to in-situ generation of hydrogen peroxide and hydroxyl radicals, and re-confirmed from scavenging studies. The dye degradation mechanism by pyritic coal is discussed in the light of solar photo-Fenton mechanism with respect to (1) qualitative identification of trace quantities of degradation products by gas chromatography-mass spectrometry technique; (2) leaching of 2700 mg/L iron in the reaction medium, estimated by inductive coupled plasma optical emission spectrometry, and (3) and changes in the chemical speciation of iron, sulphur and oxygen in the used coal by X-ray photoelectron spectroscopy. © 2018 Elsevier Ltd
Citation: Journal of Cleaner Production (2018), 195(): 1003-1014
Issue Date: 2018
Publisher: Elsevier Ltd
Keywords: Azo-dye degradation
Degradation product identification
Generation of reactive oxygen species
Pyrite rich coal
Solar photo-Fenton mechanism
ISSN: 9596526
Author Scopus IDs: 57193952223
Author Affiliations: Shaida, M.A., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Sen, A.K., Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Dutta, R.K., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Funding Details: Mr. Mohd. Azfar Shaida is grateful to Ministry of Human Resource Development (MHRD), Government of India for providing Senior Research fellowship. Authors are grateful to UGC-DAE-CSR Kolkata Centre, India for sanctioning financial grant to carry out this work. Authors also thank Dr. M. Sudarshan for allowing us to analyze the coal samples by EDXRF at UGC-DAE-CSR Kolkata Centre, India. The instrumental facilities like FE-SEM, XPS and XRD were used at Instrumental instrumentation Centre of IIT Roorkee, while ICP-OES analysis was carried out at Centre of Nanotechnology, IIT Roorkee. Appendix A
Corresponding Author: Dutta, R.K.; Department of Chemistry, Indian Institute of Technology RoorkeeIndia; email:
Appears in Collections:Journal Publications [CY]
Journal Publications [ES]

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