Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 282, Issue -, Pages 233-240Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2014.07.041
Keywords
UV absorber; 2-Phenylbenzimidazole-5-sulphonic acid (PBSA); UV-254 nm; Hydrogen peroxide; Mineralization
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Funding
- Cyprus Research Promotion Foundation
- Republic of Cyprus
- European Regional Development Fund of the EU [NEA IPODOMI/STRATH/0308/09]
- Egyptian Government Scholarship
- University of Cincinnati through a UNESCO co-Chair Professor position on Water Access and Sustainability
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Various studies have revealed the non-biodegradable and endocrine disrupting properties of sulfonated organic UV absorbers, directing people's attention toward their risks on ecological and human health and hence their removal from water. In this study, UV-254 nm/H2O2 advanced oxidation process (AOP) was investigated for degrading a model UV absorber compound 2-phenylbenzimidazole-5-sulfonic acid (PBSA) and a structurally similar compound 1H-benzimidazole-2-sulfonic acid (BSA), with a specific focus on their mineralization. At 4.0 mM [H2O2](0), a complete removal of 40.0 mu M parent PBSA and 25% decrease in TOC were achieved with 190 min of UV irradiation; SO42- was formed and reached its maximum level while the release of nitrogen as NH4+ was much lower (around 50%) at 190 min. Sulfate removal was strongly enhanced by increasing [H2O2](0) in the range of 0-4.0 mM, with slight inhibition in 4.0-12.0 mM. Faster and earlier ammonia formation was observed at higher [H2O2](0). The presence of Br- slowed down the degradation and mineralization of both compounds while a negligible effect on the degradation was observed in the presence of Cl-. Our study provides important technical and fundamental results on the HO center dot based degradation and mineralization of -SO3H and N-containing UV absorber compounds. (C) 2014 Elsevier B.V. All rights reserved.
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