Waste tire carbon in synergetic interaction with spent gamma radioactive source for efficient radiocatalytic degradation of organic dye

• Published in: Journal of hazardous materials Vol. 408; p. 124922
• Main Authors: Matović, Ljiljana, Vujasin, Radojka, Kumrić, Ksenija, Devečerski, Aleksandar, Wu, Yi-nan, Kabtamu, Daniel Manaye, Mirković, Marija, Omerašević, Mia, Petrović, Djordje
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 15-04-2021
• Subjects: Methylene blue degradation; Radiolysis; Spent sealed radioactive source; Synergism; Waste tire char; Spent sealed radioactive source; UV; UV–VIS; MB; Waste tire char; Methylene blue degradation; WTC; FT-IR; Radiolysis; SEM; DRIFT; Synergism
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2020.124922

Enhanced degradation of organic dye was achieved using two different kinds of waste materials: waste tire granules and spent sealed radioactive sources. Waste tire granules were used as raw material for the production of waste tire char (WTC), which was further utilized as an adsorbent matrix for synergetic adsorption/irradiation degradation of organic dye. The spent radioactive sources were radiographic sealed sources that originate from the industry which generate the high energy radiation. Methylene Blue (MB) was used as an organic model compound. Synthesized WTC has turbostratic structure, irregular shaped particles and developed mesoporous surface. Complete degradation of 0.02 dm3 of 100 mg dm−3 MB solution, having WTC dose of 1.25 g dm−3, was achieved with delivered doze of only 60 Gy. The applied doses were 100 times smaller than those presented in the literature. Degradation pathway was determined: OH radicals that originate from radiolysis of water and from the surface of WTC played the crucial role in the radiocatalytic degradation of MB. Breakage of the aromatic ring of MB appeared by the scission of the double C‒S+˭C bond as a result of the attack of OH species on adsorbed and electronically reorganized MB molecule.
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•Simultaneous application of spent radioactive source and carbon waste tire char.•Synergism of γ irradiation and adsorption induce improved degradation of dye.•A radiocatalytic effect of dye degradation in the solution was achieved.