Electrolysis-assisted UV/sulfite oxidation for water treatment with automatic adjustments of solution pH and dissolved oxygen
Sulfite as precursor to generate sulfate radical (SO4 •-) for water treatment has gained attention. Here we report a metal-free and highly efficient electro/UV/sulfite process to produce SO4 •- for water treatment. UV/sulfite reaction induces sulfite radical (SO3 •-), which transforms into SO4 •- in...
| Publié dans: | Chemical engineering journal (Lausanne, Switzerland : 1996). - 1999. - 403(2021) vom: 01. Jan. |
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| Auteur principal: | |
| Autres auteurs: | , , , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2021
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| Accès à la collection: | Chemical engineering journal (Lausanne, Switzerland : 1996) |
| Sujets: | Journal Article UV/sulfite decontamination disinfection electrolysis sulfate radical |
| Résumé: | Sulfite as precursor to generate sulfate radical (SO4 •-) for water treatment has gained attention. Here we report a metal-free and highly efficient electro/UV/sulfite process to produce SO4 •- for water treatment. UV/sulfite reaction induces sulfite radical (SO3 •-), which transforms into SO4 •- in the presence of oxygen generated by water electrolysis. Electro/UV/sulfite process generates a steady-state SO4 •- concentration of 0.2 to 1.1 × 10-12 M in our tests. Solution pH affects sulfite species distribution, and higher pH mediates improved yield of steady-state SO4 •- concentration. Effect of sulfite concentration exhibits a bell-shaped pattern toward SO4 •- production due to self-scavenging. The oxidation capability of electro/UV/sulfite process is manifested by removing representative micropollutants (i.e., ibuprofen, salicylic acid, and bisphenol A) and Escherichia coli model pathogen, in both synthetic and natural water matrices. This novel electro/UV/sulfite process has obvious advantages, since it bypasses metal ion catalysts, supplies reaction with electrolytically generated nascent oxygen, and overcomes the acidic pH requirement, that are challenging to traditional metal/sulfite processes. Considering the features of environmental friendliness and low cost, the proposed electro/UV/sulfite process should lead to successful applications in the future |
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| Description: | Date Revised 02.01.2022 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2020.126278 |