Sonication-assisted photocatalytic decomposition of perfluorooctanoic acid
Decomposition of perfluorinated chemicals is of significant interest in both scientific and industrial perspectives. Here, we report the decomposition of perfluorooctanoic acid (PFOA) under sonication-assisted photocatalysis by utilizing commercial TiO2 (RdH) and home-made TiO2 (sol–gel) as photocat...
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Veröffentlicht in: | Chemosphere (Oxford) 2009-05, Vol.75 (5), p.654-660 |
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description | Decomposition of perfluorinated chemicals is of significant interest in both scientific and industrial perspectives. Here, we report the decomposition of perfluorooctanoic acid (PFOA) under sonication-assisted photocatalysis by utilizing commercial TiO2 (RdH) and home-made TiO2 (sol–gel) as photocatalysts at ambient temperature, pressure and near neutral pH with the irradiation of 254nm UV light. PFOA was decomposed into fluoride ions and to several perfluorinated carboxylic acids (PFCAs) with a shorter carbon chain length such as perfluoroheptanoic acid (PFHpA), perfluorohexanoic acid (PFHxA), perfluoropropanoic acid (PFPA), and trifluoroacetic acid (TFA). The efficiency of sonication-assisted photocatalysis was found to be 64%. In all the cases, higher efficiencies were obtained when sol–gel TiO2 was used as a photocatalyst than the commercial RdH TiO2 catalyst. The specific surface area is three times higher for sol–gel TiO2 than commercial RdH TiO2 and appears to be the probable reason for the observed differences in the corresponding efficiencies. It is also interesting to note that pH plays a determining role in the decomposition of PFOA and correspondingly photocatalyses were carried out under different controlled pH. Perfluoroalkyl radicals are presumably oxidized by superoxide and hydroxyl radicals generated during the TiO2-mediated photocatalysis at pH 4 and 10, respectively. The role of sonication in sonication-assisted photocatalysis was construed to be an aid to photocatalysis than a tool itself. Sonication enhances photocatalysis through physical dispersion of TiO2 and eases mass transfer which keeps on rejuvenating the TiO2 surface. |
doi_str_mv | 10.1016/j.chemosphere.2008.12.065 |
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Here, we report the decomposition of perfluorooctanoic acid (PFOA) under sonication-assisted photocatalysis by utilizing commercial TiO2 (RdH) and home-made TiO2 (sol–gel) as photocatalysts at ambient temperature, pressure and near neutral pH with the irradiation of 254nm UV light. PFOA was decomposed into fluoride ions and to several perfluorinated carboxylic acids (PFCAs) with a shorter carbon chain length such as perfluoroheptanoic acid (PFHpA), perfluorohexanoic acid (PFHxA), perfluoropropanoic acid (PFPA), and trifluoroacetic acid (TFA). The efficiency of sonication-assisted photocatalysis was found to be 64%. In all the cases, higher efficiencies were obtained when sol–gel TiO2 was used as a photocatalyst than the commercial RdH TiO2 catalyst. The specific surface area is three times higher for sol–gel TiO2 than commercial RdH TiO2 and appears to be the probable reason for the observed differences in the corresponding efficiencies. It is also interesting to note that pH plays a determining role in the decomposition of PFOA and correspondingly photocatalyses were carried out under different controlled pH. Perfluoroalkyl radicals are presumably oxidized by superoxide and hydroxyl radicals generated during the TiO2-mediated photocatalysis at pH 4 and 10, respectively. The role of sonication in sonication-assisted photocatalysis was construed to be an aid to photocatalysis than a tool itself. Sonication enhances photocatalysis through physical dispersion of TiO2 and eases mass transfer which keeps on rejuvenating the TiO2 surface.</description><identifier>ISSN: 0045-6535</identifier><identifier>EISSN: 1879-1298</identifier><identifier>DOI: 10.1016/j.chemosphere.2008.12.065</identifier><identifier>PMID: 19201007</identifier><identifier>CODEN: CMSHAF</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Applied sciences ; Caprylates - analysis ; Caprylates - metabolism ; Catalysis ; Decomposition mechanism ; Environmental Restoration and Remediation ; Exact sciences and technology ; Fluorocarbons - analysis ; Fluorocarbons - metabolism ; Global environmental pollution ; Hydrogen-Ion Concentration ; PFOA ; Photochemistry - methods ; Pollution ; Sonication ; TiO2 ; Titanium - chemistry ; Ultraviolet Rays ; UV irradiation</subject><ispartof>Chemosphere (Oxford), 2009-05, Vol.75 (5), p.654-660</ispartof><rights>2009 Elsevier Ltd</rights><rights>2009 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c565t-191d50b34a3eff916da464e9dc129014ae5c23ca86115ab35146e076897970063</citedby><cites>FETCH-LOGICAL-c565t-191d50b34a3eff916da464e9dc129014ae5c23ca86115ab35146e076897970063</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.chemosphere.2008.12.065$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=21398301$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/19201007$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Panchangam, Sri Chandana</creatorcontrib><creatorcontrib>Lin, Angela Yu-Chen</creatorcontrib><creatorcontrib>Tsai, Jia-Hong</creatorcontrib><creatorcontrib>Lin, Cheng-Fang</creatorcontrib><title>Sonication-assisted photocatalytic decomposition of perfluorooctanoic acid</title><title>Chemosphere (Oxford)</title><addtitle>Chemosphere</addtitle><description>Decomposition of perfluorinated chemicals is of significant interest in both scientific and industrial perspectives. Here, we report the decomposition of perfluorooctanoic acid (PFOA) under sonication-assisted photocatalysis by utilizing commercial TiO2 (RdH) and home-made TiO2 (sol–gel) as photocatalysts at ambient temperature, pressure and near neutral pH with the irradiation of 254nm UV light. PFOA was decomposed into fluoride ions and to several perfluorinated carboxylic acids (PFCAs) with a shorter carbon chain length such as perfluoroheptanoic acid (PFHpA), perfluorohexanoic acid (PFHxA), perfluoropropanoic acid (PFPA), and trifluoroacetic acid (TFA). The efficiency of sonication-assisted photocatalysis was found to be 64%. In all the cases, higher efficiencies were obtained when sol–gel TiO2 was used as a photocatalyst than the commercial RdH TiO2 catalyst. The specific surface area is three times higher for sol–gel TiO2 than commercial RdH TiO2 and appears to be the probable reason for the observed differences in the corresponding efficiencies. It is also interesting to note that pH plays a determining role in the decomposition of PFOA and correspondingly photocatalyses were carried out under different controlled pH. Perfluoroalkyl radicals are presumably oxidized by superoxide and hydroxyl radicals generated during the TiO2-mediated photocatalysis at pH 4 and 10, respectively. The role of sonication in sonication-assisted photocatalysis was construed to be an aid to photocatalysis than a tool itself. Sonication enhances photocatalysis through physical dispersion of TiO2 and eases mass transfer which keeps on rejuvenating the TiO2 surface.</description><subject>Applied sciences</subject><subject>Caprylates - analysis</subject><subject>Caprylates - metabolism</subject><subject>Catalysis</subject><subject>Decomposition mechanism</subject><subject>Environmental Restoration and Remediation</subject><subject>Exact sciences and technology</subject><subject>Fluorocarbons - analysis</subject><subject>Fluorocarbons - metabolism</subject><subject>Global environmental pollution</subject><subject>Hydrogen-Ion Concentration</subject><subject>PFOA</subject><subject>Photochemistry - methods</subject><subject>Pollution</subject><subject>Sonication</subject><subject>TiO2</subject><subject>Titanium - chemistry</subject><subject>Ultraviolet Rays</subject><subject>UV irradiation</subject><issn>0045-6535</issn><issn>1879-1298</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqN0U1v1DAQBmALgei28BfQcoCeks7EH4mPaMVXVYlD4Wx57YnWqyQOdrZS_3292hVwAk6WrOe1R_My9hahRkB1s6_djsaY5x0lqhuArsamBiWfsRV2ra6w0d1ztgIQslKSywt2mfMeoISlfskuUDeAAO2K3d7HKTi7hDhVNueQF_LreReXWC7t8LgEt_bk4jjHHI5qHfv1TKkfDjHF6BY7xUKsC_4Ve9HbIdPr83nFfnz6-H3zpbr79vnr5sNd5aSSS4UavYQtF5ZT32tU3golSHtXpgYUlqRruLOdQpR2yyUKRdCqTre6BVD8il2f3p1T_HmgvJgxZEfDYCeKh2w0cMU7AbLI93-VXIiW6w7-CVF3DZQ9F6hP0KWYc6LezCmMNj0aBHPsxuzNH92YYzcGG1O6Kdk3508O25H87-S5jALenYHNzg59spML-ZdrsMzKAYvbnByVLT8ESia7QJMjHxK5xfgY_mOcJ6dlstw</recordid><startdate>20090501</startdate><enddate>20090501</enddate><creator>Panchangam, Sri Chandana</creator><creator>Lin, Angela Yu-Chen</creator><creator>Tsai, Jia-Hong</creator><creator>Lin, Cheng-Fang</creator><general>Elsevier Ltd</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>7TV</scope><scope>C1K</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope></search><sort><creationdate>20090501</creationdate><title>Sonication-assisted photocatalytic decomposition of perfluorooctanoic acid</title><author>Panchangam, Sri Chandana ; Lin, Angela Yu-Chen ; Tsai, Jia-Hong ; Lin, Cheng-Fang</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c565t-191d50b34a3eff916da464e9dc129014ae5c23ca86115ab35146e076897970063</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Applied sciences</topic><topic>Caprylates - analysis</topic><topic>Caprylates - metabolism</topic><topic>Catalysis</topic><topic>Decomposition mechanism</topic><topic>Environmental Restoration and Remediation</topic><topic>Exact sciences and technology</topic><topic>Fluorocarbons - analysis</topic><topic>Fluorocarbons - metabolism</topic><topic>Global environmental pollution</topic><topic>Hydrogen-Ion Concentration</topic><topic>PFOA</topic><topic>Photochemistry - methods</topic><topic>Pollution</topic><topic>Sonication</topic><topic>TiO2</topic><topic>Titanium - chemistry</topic><topic>Ultraviolet Rays</topic><topic>UV irradiation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Panchangam, Sri Chandana</creatorcontrib><creatorcontrib>Lin, Angela Yu-Chen</creatorcontrib><creatorcontrib>Tsai, Jia-Hong</creatorcontrib><creatorcontrib>Lin, Cheng-Fang</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>Pollution Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Chemosphere (Oxford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Panchangam, Sri Chandana</au><au>Lin, Angela Yu-Chen</au><au>Tsai, Jia-Hong</au><au>Lin, Cheng-Fang</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Sonication-assisted photocatalytic decomposition of perfluorooctanoic acid</atitle><jtitle>Chemosphere (Oxford)</jtitle><addtitle>Chemosphere</addtitle><date>2009-05-01</date><risdate>2009</risdate><volume>75</volume><issue>5</issue><spage>654</spage><epage>660</epage><pages>654-660</pages><issn>0045-6535</issn><eissn>1879-1298</eissn><coden>CMSHAF</coden><abstract>Decomposition of perfluorinated chemicals is of significant interest in both scientific and industrial perspectives. Here, we report the decomposition of perfluorooctanoic acid (PFOA) under sonication-assisted photocatalysis by utilizing commercial TiO2 (RdH) and home-made TiO2 (sol–gel) as photocatalysts at ambient temperature, pressure and near neutral pH with the irradiation of 254nm UV light. PFOA was decomposed into fluoride ions and to several perfluorinated carboxylic acids (PFCAs) with a shorter carbon chain length such as perfluoroheptanoic acid (PFHpA), perfluorohexanoic acid (PFHxA), perfluoropropanoic acid (PFPA), and trifluoroacetic acid (TFA). The efficiency of sonication-assisted photocatalysis was found to be 64%. In all the cases, higher efficiencies were obtained when sol–gel TiO2 was used as a photocatalyst than the commercial RdH TiO2 catalyst. The specific surface area is three times higher for sol–gel TiO2 than commercial RdH TiO2 and appears to be the probable reason for the observed differences in the corresponding efficiencies. It is also interesting to note that pH plays a determining role in the decomposition of PFOA and correspondingly photocatalyses were carried out under different controlled pH. Perfluoroalkyl radicals are presumably oxidized by superoxide and hydroxyl radicals generated during the TiO2-mediated photocatalysis at pH 4 and 10, respectively. The role of sonication in sonication-assisted photocatalysis was construed to be an aid to photocatalysis than a tool itself. Sonication enhances photocatalysis through physical dispersion of TiO2 and eases mass transfer which keeps on rejuvenating the TiO2 surface.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><pmid>19201007</pmid><doi>10.1016/j.chemosphere.2008.12.065</doi><tpages>7</tpages></addata></record> |
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subjects | Applied sciences Caprylates - analysis Caprylates - metabolism Catalysis Decomposition mechanism Environmental Restoration and Remediation Exact sciences and technology Fluorocarbons - analysis Fluorocarbons - metabolism Global environmental pollution Hydrogen-Ion Concentration PFOA Photochemistry - methods Pollution Sonication TiO2 Titanium - chemistry Ultraviolet Rays UV irradiation |
title | Sonication-assisted photocatalytic decomposition of perfluorooctanoic acid |
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