Photochemical decomposition of perfluorooctanoic acid mediated by iron in strongly acidic conditions
•Perfluorooctanoic acid (PFOA) was decomposed based on ferric ion performance.•Complete decomposition of PFOA was confirmed in strongly acidic conditions.•Fe2+ changed to Fe3+ to restore chemical equilibrium in this condition.•Fe3+ was only produced from Fe2+ by hydroxyl radical in weakly acidic con...
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| Veröffentlicht in: | Journal of hazardous materials 2014-03, Vol.268, p.150-155 |
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| creator | Ohno, Masaki Ito, Masataka Ohkura, Ryouichi Mino A, Esteban R. Kose, Tomohiro Okuda, Tetsuji Nakai, Satoshi Kawata, Kuniaki Nishijima, Wataru |
| description | •Perfluorooctanoic acid (PFOA) was decomposed based on ferric ion performance.•Complete decomposition of PFOA was confirmed in strongly acidic conditions.•Fe2+ changed to Fe3+ to restore chemical equilibrium in this condition.•Fe3+ was only produced from Fe2+ by hydroxyl radical in weakly acidic conditions.•The Fe3+ regeneration mechanisms resulted in the performance of Fe3+ for PFOA.
The performance of a ferric ion mediated photochemical process for perfluorooctanoic acid (PFOA) decomposition in strongly acidic conditions of pH 2.0 was evaluated in comparison with those in weakly acidic conditions, pH 3.7 or pH 5.0, based on iron species composition and ferric ion regeneration. Complete decomposition of PFOA under UV irradiation was confirmed at pH 2.0, whereas perfluoroheptanoic acid (PFHpA) and other intermediates were accumulated in weakly acidic conditions. Iron states at each pH were evaluated using a chemical equilibrium model, Visual MINTEQ. The main iron species at pH 2.0 is Fe3+ ion. Although Fe3+ ion is consumed and is transformed to Fe2+ ion by photochemical decomposition of PFOA and its intermediates, the produced Fe2+ ion will change to Fe3+ ion to restore chemical equilibrium. Continuous decomposition will occur at pH 2.0. However, half of the iron cannot be dissolved at pH 3.7. The main species of dissolved iron is Fe(OH)2+. At pH 3.7 or higher pH, Fe3+ ion will only be produced from the oxidation of Fe2+ ion by hydroxyl radical produced by Fe(OH)2+ under UV irradiation. These different mechanisms of Fe3+ regeneration that prevail in strongly and weakly acidic conditions will engender different performances of the ferric ion. |
| doi_str_mv | 10.1016/j.jhazmat.2013.12.059 |
| format | Article |
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The performance of a ferric ion mediated photochemical process for perfluorooctanoic acid (PFOA) decomposition in strongly acidic conditions of pH 2.0 was evaluated in comparison with those in weakly acidic conditions, pH 3.7 or pH 5.0, based on iron species composition and ferric ion regeneration. Complete decomposition of PFOA under UV irradiation was confirmed at pH 2.0, whereas perfluoroheptanoic acid (PFHpA) and other intermediates were accumulated in weakly acidic conditions. Iron states at each pH were evaluated using a chemical equilibrium model, Visual MINTEQ. The main iron species at pH 2.0 is Fe3+ ion. Although Fe3+ ion is consumed and is transformed to Fe2+ ion by photochemical decomposition of PFOA and its intermediates, the produced Fe2+ ion will change to Fe3+ ion to restore chemical equilibrium. Continuous decomposition will occur at pH 2.0. However, half of the iron cannot be dissolved at pH 3.7. The main species of dissolved iron is Fe(OH)2+. At pH 3.7 or higher pH, Fe3+ ion will only be produced from the oxidation of Fe2+ ion by hydroxyl radical produced by Fe(OH)2+ under UV irradiation. These different mechanisms of Fe3+ regeneration that prevail in strongly and weakly acidic conditions will engender different performances of the ferric ion.</description><identifier>ISSN: 0304-3894</identifier><identifier>EISSN: 1873-3336</identifier><identifier>DOI: 10.1016/j.jhazmat.2013.12.059</identifier><identifier>PMID: 24491439</identifier><identifier>CODEN: JHMAD9</identifier><language>eng</language><publisher>Kidlington: Elsevier B.V</publisher><subject>Acid condition ; Applied sciences ; Caprylates - chemistry ; Caprylates - isolation & purification ; Caprylates - radiation effects ; Chemical engineering ; Decomposition ; Exact sciences and technology ; Ferric Compounds - chemistry ; Ferric ion ; Fluorocarbons - chemistry ; Fluorocarbons - isolation & purification ; Fluorocarbons - radiation effects ; Hydrogen-Ion Concentration ; Perfluorooctanoic acid ; Pollution ; Reactors ; Ultraviolet ; Ultraviolet Rays ; Waste Water - chemistry ; Water Pollutants, Chemical - chemistry ; Water Pollutants, Chemical - isolation & purification ; Water Pollutants, Chemical - radiation effects ; Water Purification - methods</subject><ispartof>Journal of hazardous materials, 2014-03, Vol.268, p.150-155</ispartof><rights>2014 Elsevier B.V.</rights><rights>2015 INIST-CNRS</rights><rights>Copyright © 2014 Elsevier B.V. All rights reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c498t-a367c1a920e09c1db12e52d9572bc2010c1adf6bcf41d27548071ee93b783f713</citedby><cites>FETCH-LOGICAL-c498t-a367c1a920e09c1db12e52d9572bc2010c1adf6bcf41d27548071ee93b783f713</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0304389413009916$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=28306800$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/24491439$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Ohno, Masaki</creatorcontrib><creatorcontrib>Ito, Masataka</creatorcontrib><creatorcontrib>Ohkura, Ryouichi</creatorcontrib><creatorcontrib>Mino A, Esteban R.</creatorcontrib><creatorcontrib>Kose, Tomohiro</creatorcontrib><creatorcontrib>Okuda, Tetsuji</creatorcontrib><creatorcontrib>Nakai, Satoshi</creatorcontrib><creatorcontrib>Kawata, Kuniaki</creatorcontrib><creatorcontrib>Nishijima, Wataru</creatorcontrib><title>Photochemical decomposition of perfluorooctanoic acid mediated by iron in strongly acidic conditions</title><title>Journal of hazardous materials</title><addtitle>J Hazard Mater</addtitle><description>•Perfluorooctanoic acid (PFOA) was decomposed based on ferric ion performance.•Complete decomposition of PFOA was confirmed in strongly acidic conditions.•Fe2+ changed to Fe3+ to restore chemical equilibrium in this condition.•Fe3+ was only produced from Fe2+ by hydroxyl radical in weakly acidic conditions.•The Fe3+ regeneration mechanisms resulted in the performance of Fe3+ for PFOA.
The performance of a ferric ion mediated photochemical process for perfluorooctanoic acid (PFOA) decomposition in strongly acidic conditions of pH 2.0 was evaluated in comparison with those in weakly acidic conditions, pH 3.7 or pH 5.0, based on iron species composition and ferric ion regeneration. Complete decomposition of PFOA under UV irradiation was confirmed at pH 2.0, whereas perfluoroheptanoic acid (PFHpA) and other intermediates were accumulated in weakly acidic conditions. Iron states at each pH were evaluated using a chemical equilibrium model, Visual MINTEQ. The main iron species at pH 2.0 is Fe3+ ion. Although Fe3+ ion is consumed and is transformed to Fe2+ ion by photochemical decomposition of PFOA and its intermediates, the produced Fe2+ ion will change to Fe3+ ion to restore chemical equilibrium. Continuous decomposition will occur at pH 2.0. However, half of the iron cannot be dissolved at pH 3.7. The main species of dissolved iron is Fe(OH)2+. At pH 3.7 or higher pH, Fe3+ ion will only be produced from the oxidation of Fe2+ ion by hydroxyl radical produced by Fe(OH)2+ under UV irradiation. These different mechanisms of Fe3+ regeneration that prevail in strongly and weakly acidic conditions will engender different performances of the ferric ion.</description><subject>Acid condition</subject><subject>Applied sciences</subject><subject>Caprylates - chemistry</subject><subject>Caprylates - isolation & purification</subject><subject>Caprylates - radiation effects</subject><subject>Chemical engineering</subject><subject>Decomposition</subject><subject>Exact sciences and technology</subject><subject>Ferric Compounds - chemistry</subject><subject>Ferric ion</subject><subject>Fluorocarbons - chemistry</subject><subject>Fluorocarbons - isolation & purification</subject><subject>Fluorocarbons - radiation effects</subject><subject>Hydrogen-Ion Concentration</subject><subject>Perfluorooctanoic acid</subject><subject>Pollution</subject><subject>Reactors</subject><subject>Ultraviolet</subject><subject>Ultraviolet Rays</subject><subject>Waste Water - chemistry</subject><subject>Water Pollutants, Chemical - chemistry</subject><subject>Water Pollutants, Chemical - isolation & purification</subject><subject>Water Pollutants, Chemical - radiation effects</subject><subject>Water Purification - methods</subject><issn>0304-3894</issn><issn>1873-3336</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkEuLFDEQgIMo7rj6E5S-CF66rUrSj5xEFnWFBT3oOaQraSdDd2dMMsL4683sjO7RUxXUV6-PsZcIDQJ2b3fNbmt-LyY3HFA0yBto1SO2waEXtRCie8w2IEDWYlDyij1LaQcA2LfyKbviUiqUQm2Y_boNOdDWLZ7MXFlHYdmH5LMPaxWmau_iNB9CDIGyWYOnypC31eKsN9nZajxWPhbUr1XKJfkxH--JAlJY7f2c9Jw9mcyc3ItLvGbfP374dnNb33359Pnm_V1NUg25NqLrCY3i4EAR2hG5a7lVbc9HKl9CKdqpG2mSaHn5ZIAenVNi7Acx9Siu2Zvz3H0MPw8uZb34RG6ezerCIWlsAQchO3VC2zNKMaQU3aT30S8mHjWCPgnWO30RrE-CNXJdBJe-V5cVh7FI-Nf112gBXl8Ak4rRKZqVfHrgBgHdAFC4d2fOFSG_vIs6kXcrFbHRUdY2-P-c8gfE_p2O</recordid><startdate>20140315</startdate><enddate>20140315</enddate><creator>Ohno, Masaki</creator><creator>Ito, Masataka</creator><creator>Ohkura, Ryouichi</creator><creator>Mino A, Esteban R.</creator><creator>Kose, Tomohiro</creator><creator>Okuda, Tetsuji</creator><creator>Nakai, Satoshi</creator><creator>Kawata, Kuniaki</creator><creator>Nishijima, Wataru</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20140315</creationdate><title>Photochemical decomposition of perfluorooctanoic acid mediated by iron in strongly acidic conditions</title><author>Ohno, Masaki ; Ito, Masataka ; Ohkura, Ryouichi ; Mino A, Esteban R. ; Kose, Tomohiro ; Okuda, Tetsuji ; Nakai, Satoshi ; Kawata, Kuniaki ; Nishijima, Wataru</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c498t-a367c1a920e09c1db12e52d9572bc2010c1adf6bcf41d27548071ee93b783f713</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Acid condition</topic><topic>Applied sciences</topic><topic>Caprylates - chemistry</topic><topic>Caprylates - isolation & purification</topic><topic>Caprylates - radiation effects</topic><topic>Chemical engineering</topic><topic>Decomposition</topic><topic>Exact sciences and technology</topic><topic>Ferric Compounds - chemistry</topic><topic>Ferric ion</topic><topic>Fluorocarbons - chemistry</topic><topic>Fluorocarbons - isolation & purification</topic><topic>Fluorocarbons - radiation effects</topic><topic>Hydrogen-Ion Concentration</topic><topic>Perfluorooctanoic acid</topic><topic>Pollution</topic><topic>Reactors</topic><topic>Ultraviolet</topic><topic>Ultraviolet Rays</topic><topic>Waste Water - chemistry</topic><topic>Water Pollutants, Chemical - chemistry</topic><topic>Water Pollutants, Chemical - isolation & purification</topic><topic>Water Pollutants, Chemical - radiation effects</topic><topic>Water Purification - methods</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ohno, Masaki</creatorcontrib><creatorcontrib>Ito, Masataka</creatorcontrib><creatorcontrib>Ohkura, Ryouichi</creatorcontrib><creatorcontrib>Mino A, Esteban R.</creatorcontrib><creatorcontrib>Kose, Tomohiro</creatorcontrib><creatorcontrib>Okuda, Tetsuji</creatorcontrib><creatorcontrib>Nakai, Satoshi</creatorcontrib><creatorcontrib>Kawata, Kuniaki</creatorcontrib><creatorcontrib>Nishijima, Wataru</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of hazardous materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ohno, Masaki</au><au>Ito, Masataka</au><au>Ohkura, Ryouichi</au><au>Mino A, Esteban R.</au><au>Kose, Tomohiro</au><au>Okuda, Tetsuji</au><au>Nakai, Satoshi</au><au>Kawata, Kuniaki</au><au>Nishijima, Wataru</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Photochemical decomposition of perfluorooctanoic acid mediated by iron in strongly acidic conditions</atitle><jtitle>Journal of hazardous materials</jtitle><addtitle>J Hazard Mater</addtitle><date>2014-03-15</date><risdate>2014</risdate><volume>268</volume><spage>150</spage><epage>155</epage><pages>150-155</pages><issn>0304-3894</issn><eissn>1873-3336</eissn><coden>JHMAD9</coden><abstract>•Perfluorooctanoic acid (PFOA) was decomposed based on ferric ion performance.•Complete decomposition of PFOA was confirmed in strongly acidic conditions.•Fe2+ changed to Fe3+ to restore chemical equilibrium in this condition.•Fe3+ was only produced from Fe2+ by hydroxyl radical in weakly acidic conditions.•The Fe3+ regeneration mechanisms resulted in the performance of Fe3+ for PFOA.
The performance of a ferric ion mediated photochemical process for perfluorooctanoic acid (PFOA) decomposition in strongly acidic conditions of pH 2.0 was evaluated in comparison with those in weakly acidic conditions, pH 3.7 or pH 5.0, based on iron species composition and ferric ion regeneration. Complete decomposition of PFOA under UV irradiation was confirmed at pH 2.0, whereas perfluoroheptanoic acid (PFHpA) and other intermediates were accumulated in weakly acidic conditions. Iron states at each pH were evaluated using a chemical equilibrium model, Visual MINTEQ. The main iron species at pH 2.0 is Fe3+ ion. Although Fe3+ ion is consumed and is transformed to Fe2+ ion by photochemical decomposition of PFOA and its intermediates, the produced Fe2+ ion will change to Fe3+ ion to restore chemical equilibrium. Continuous decomposition will occur at pH 2.0. However, half of the iron cannot be dissolved at pH 3.7. The main species of dissolved iron is Fe(OH)2+. At pH 3.7 or higher pH, Fe3+ ion will only be produced from the oxidation of Fe2+ ion by hydroxyl radical produced by Fe(OH)2+ under UV irradiation. These different mechanisms of Fe3+ regeneration that prevail in strongly and weakly acidic conditions will engender different performances of the ferric ion.</abstract><cop>Kidlington</cop><pub>Elsevier B.V</pub><pmid>24491439</pmid><doi>10.1016/j.jhazmat.2013.12.059</doi><tpages>6</tpages></addata></record> |
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| subjects | Acid condition Applied sciences Caprylates - chemistry Caprylates - isolation & purification Caprylates - radiation effects Chemical engineering Decomposition Exact sciences and technology Ferric Compounds - chemistry Ferric ion Fluorocarbons - chemistry Fluorocarbons - isolation & purification Fluorocarbons - radiation effects Hydrogen-Ion Concentration Perfluorooctanoic acid Pollution Reactors Ultraviolet Ultraviolet Rays Waste Water - chemistry Water Pollutants, Chemical - chemistry Water Pollutants, Chemical - isolation & purification Water Pollutants, Chemical - radiation effects Water Purification - methods |
| title | Photochemical decomposition of perfluorooctanoic acid mediated by iron in strongly acidic conditions |
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