Photocatalytic degradation of imazethapyr herbicide at TiO2/H2O interface
The photocatalytic degradation of imazethapyr, a herbicide of the imidazolinone family, was investigated in an aqueous suspension of titanium dioxide used as a catalyst. A pseudo-first order kinetic model was employed to discuss the results. The effect of catalyst loading, initial concentration of i...
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| Veröffentlicht in: | Chemosphere (Oxford) 2005-03, Vol.58 (10), p.1461-1469 |
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| creator | ISHIKI, Renata Rumi ISHIKI, Hamilton Mitsugu TAKASHIMA, Keiko |
| description | The photocatalytic degradation of imazethapyr, a herbicide of the imidazolinone family, was investigated in an aqueous suspension of titanium dioxide used as a catalyst. A pseudo-first order kinetic model was employed to discuss the results. The effect of catalyst loading, initial concentration of imazethapyr, hydrogen peroxide, pH value, and temperature were investigated. Imazethapyr disappearance as a function of irradiation time was analyzed by HPLC. The ammonium ion formation was determined spectrophotometrically at 694 nm. The degradation was observed to proceed more favorably at natural pH (ca. 4.4) when the pH was varied in the range from 2 to 11. The addition of hydrogen peroxide to the TiO2 suspension enhanced the degradation rate constant up to 5.0x10(-3) mol l-1, but decreased it at higher concentrations. The degradation rate constants decreased by 19% with a temperature increase from 20 to 40 degrees C in the TiO2 suspension, whereas a 16% increase in imazethapyr direct photolysis was observed for the same temperature range. This behavior indicates the occurrence of physisorption between TiO2 and imazethapyr molecules. |
| doi_str_mv | 10.1016/j.chemosphere.2004.09.094 |
| format | Article |
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A pseudo-first order kinetic model was employed to discuss the results. The effect of catalyst loading, initial concentration of imazethapyr, hydrogen peroxide, pH value, and temperature were investigated. Imazethapyr disappearance as a function of irradiation time was analyzed by HPLC. The ammonium ion formation was determined spectrophotometrically at 694 nm. The degradation was observed to proceed more favorably at natural pH (ca. 4.4) when the pH was varied in the range from 2 to 11. The addition of hydrogen peroxide to the TiO2 suspension enhanced the degradation rate constant up to 5.0x10(-3) mol l-1, but decreased it at higher concentrations. The degradation rate constants decreased by 19% with a temperature increase from 20 to 40 degrees C in the TiO2 suspension, whereas a 16% increase in imazethapyr direct photolysis was observed for the same temperature range. 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A pseudo-first order kinetic model was employed to discuss the results. The effect of catalyst loading, initial concentration of imazethapyr, hydrogen peroxide, pH value, and temperature were investigated. Imazethapyr disappearance as a function of irradiation time was analyzed by HPLC. The ammonium ion formation was determined spectrophotometrically at 694 nm. The degradation was observed to proceed more favorably at natural pH (ca. 4.4) when the pH was varied in the range from 2 to 11. The addition of hydrogen peroxide to the TiO2 suspension enhanced the degradation rate constant up to 5.0x10(-3) mol l-1, but decreased it at higher concentrations. The degradation rate constants decreased by 19% with a temperature increase from 20 to 40 degrees C in the TiO2 suspension, whereas a 16% increase in imazethapyr direct photolysis was observed for the same temperature range. This behavior indicates the occurrence of physisorption between TiO2 and imazethapyr molecules.</description><subject>Applied sciences</subject><subject>Biological and physicochemical phenomena</subject><subject>Catalysis</subject><subject>Chromatography, High Pressure Liquid</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Engineering and environment geology. Geothermics</subject><subject>Exact sciences and technology</subject><subject>General purification processes</subject><subject>Herbicides - chemistry</subject><subject>Hydrogen Peroxide - analysis</subject><subject>Hydrogen-Ion Concentration</subject><subject>Kinetics</subject><subject>Light</subject><subject>Models, Chemical</subject><subject>Natural water pollution</subject><subject>Nicotinic Acids - chemistry</subject><subject>Photochemistry</subject><subject>Photolysis</subject><subject>Pollution</subject><subject>Pollution, environment geology</subject><subject>Quaternary Ammonium Compounds - analysis</subject><subject>Spectrophotometry</subject><subject>Temperature</subject><subject>Titanium - chemistry</subject><subject>Wastewaters</subject><subject>Water - chemistry</subject><subject>Water treatment and pollution</subject><issn>0045-6535</issn><issn>1879-1298</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpNkEFPAjEQhRujEUT_glkPeltou9tuezREhYQED3huhu6slCwstuWAv94SSDCZzBzme_Myj5AnRoeMMjlaD-0KN13YrdDjkFNaDqlOVV6RPlOVzhnX6pr000LkUhSiR-5CWFOaxELfkh4TUslKij6Zfq662FmI0B6is1mN3x5qiK7bZl2TuQ38YlzB7uCzZLZ01tWYQcwWbs5HEz7P3Daib8DiPblpoA34cJ4D8vX-thhP8tn8Yzp-neW2qHjMOdBCSMuV1rIS1NoSWAFyiWXNU0dNrVSNlA0qqxVyiYUqGAXFl5WktCkG5OV0d-e7nz2GaDYuWGxb2GK3D4bTSnChywTqE2h9F4LHxux8-scfDKPmmKNZm385mmOOhupUR-3j2WS_3GB9UZ6DS8DzGYBgoW08bK0LF06KSpSiKv4AKop_aw</recordid><startdate>20050301</startdate><enddate>20050301</enddate><creator>ISHIKI, Renata Rumi</creator><creator>ISHIKI, Hamilton Mitsugu</creator><creator>TAKASHIMA, Keiko</creator><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></search><sort><creationdate>20050301</creationdate><title>Photocatalytic degradation of imazethapyr herbicide at TiO2/H2O interface</title><author>ISHIKI, Renata Rumi ; ISHIKI, Hamilton Mitsugu ; TAKASHIMA, Keiko</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c372t-2a0356c28996750cc4a13a6be4d26bee90c68f66fe8c98e26e38310a82b7600f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Applied sciences</topic><topic>Biological and physicochemical phenomena</topic><topic>Catalysis</topic><topic>Chromatography, High Pressure Liquid</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Engineering and environment geology. Geothermics</topic><topic>Exact sciences and technology</topic><topic>General purification processes</topic><topic>Herbicides - chemistry</topic><topic>Hydrogen Peroxide - analysis</topic><topic>Hydrogen-Ion Concentration</topic><topic>Kinetics</topic><topic>Light</topic><topic>Models, Chemical</topic><topic>Natural water pollution</topic><topic>Nicotinic Acids - chemistry</topic><topic>Photochemistry</topic><topic>Photolysis</topic><topic>Pollution</topic><topic>Pollution, environment geology</topic><topic>Quaternary Ammonium Compounds - analysis</topic><topic>Spectrophotometry</topic><topic>Temperature</topic><topic>Titanium - chemistry</topic><topic>Wastewaters</topic><topic>Water - chemistry</topic><topic>Water treatment and pollution</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>ISHIKI, Renata Rumi</creatorcontrib><creatorcontrib>ISHIKI, Hamilton Mitsugu</creatorcontrib><creatorcontrib>TAKASHIMA, Keiko</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><jtitle>Chemosphere (Oxford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>ISHIKI, Renata Rumi</au><au>ISHIKI, Hamilton Mitsugu</au><au>TAKASHIMA, Keiko</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Photocatalytic degradation of imazethapyr herbicide at TiO2/H2O interface</atitle><jtitle>Chemosphere (Oxford)</jtitle><addtitle>Chemosphere</addtitle><date>2005-03-01</date><risdate>2005</risdate><volume>58</volume><issue>10</issue><spage>1461</spage><epage>1469</epage><pages>1461-1469</pages><issn>0045-6535</issn><eissn>1879-1298</eissn><coden>CMSHAF</coden><abstract>The photocatalytic degradation of imazethapyr, a herbicide of the imidazolinone family, was investigated in an aqueous suspension of titanium dioxide used as a catalyst. A pseudo-first order kinetic model was employed to discuss the results. The effect of catalyst loading, initial concentration of imazethapyr, hydrogen peroxide, pH value, and temperature were investigated. Imazethapyr disappearance as a function of irradiation time was analyzed by HPLC. The ammonium ion formation was determined spectrophotometrically at 694 nm. The degradation was observed to proceed more favorably at natural pH (ca. 4.4) when the pH was varied in the range from 2 to 11. The addition of hydrogen peroxide to the TiO2 suspension enhanced the degradation rate constant up to 5.0x10(-3) mol l-1, but decreased it at higher concentrations. The degradation rate constants decreased by 19% with a temperature increase from 20 to 40 degrees C in the TiO2 suspension, whereas a 16% increase in imazethapyr direct photolysis was observed for the same temperature range. This behavior indicates the occurrence of physisorption between TiO2 and imazethapyr molecules.</abstract><cop>Oxford</cop><pub>Elsevier</pub><pmid>15686765</pmid><doi>10.1016/j.chemosphere.2004.09.094</doi><tpages>9</tpages></addata></record> |
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| subjects | Applied sciences Biological and physicochemical phenomena Catalysis Chromatography, High Pressure Liquid Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Exact sciences and technology General purification processes Herbicides - chemistry Hydrogen Peroxide - analysis Hydrogen-Ion Concentration Kinetics Light Models, Chemical Natural water pollution Nicotinic Acids - chemistry Photochemistry Photolysis Pollution Pollution, environment geology Quaternary Ammonium Compounds - analysis Spectrophotometry Temperature Titanium - chemistry Wastewaters Water - chemistry Water treatment and pollution |
| title | Photocatalytic degradation of imazethapyr herbicide at TiO2/H2O interface |
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