Sulfate radical-based oxidation of an alcohol ethoxylate (Brij30(R)) by the PS/UV-C process

Ecer Uzun C., Kabdaşlı N. I., Ölmez Hancı T., Tuenay O.

WATER SCIENCE AND TECHNOLOGY, cilt.81, sa.2, ss.383-394, 2020 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 81 Sayı: 2
  • Basım Tarihi: 2020
  • Doi Numarası: 10.2166/wst.2020.118
  • Dergi Adı: WATER SCIENCE AND TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Agricultural & Environmental Science Database, Analytical Abstracts, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chimica, Compendex, EMBASE, Environment Index, Geobase, MEDLINE, Pollution Abstracts, Public Affairs Index, Veterinary Science Database
  • Sayfa Sayıları: ss.383-394
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

In this study, sulfate radical-based oxidation of an alcohol ethoxylate (AE) was explored by the persulfate (PS)/UV-C process. Poly(oxyethylene)(4)laurylether, commercially known as Brij30(R), was used as a model AE. PS/UV-C oxidation of aqueous Brij30(R) (8-20 mg/L) was performed at initial PS concentrations varying between 0.50 and 6.50 mM and at initial pH values of 3.0 and 6.0. Results indicated that an increase in both initial PS and Brij30(R) concentrations did not have a significant effect on Brij30(R) removal efficiency and that Brij30(R) abatements of more than 90% could be achieved after 60 min of treatment time. Total organic carbon (TOC) removals were significantly improved with increasing initial PS concentrations for both initial pH values. On the other hand, an increase in initial Brij30(R) concentration had a negative effect on mineralization. By employing the competitive kinetic method, the second-order reaction rate coefficient of Brij30(R) with the sulfate radical (SO4 center dot-) was determined as 1.62 x 10(9) +/- 3.5 x 10(7) M(-1)s(-1). The second-order reaction rate constant of TOC, originating from Brij30(R) and reaction intermediates, was found to be 9.09 x 10(5) +/- 2.91 x 10(5) M(-1)s(-1) and 1.13 x 10(6) +/- 0.46 x 10(6) M(-1)s(-1) for pH values of 6.0 and 3.0, respectively. Toxicity of PS/UV-C treated aqueous Brij30(R) solutions towards Vibrio fischeri was also investigated to determine the possible toxic behavior of oxidation products.