Photocatalytic degradation of isoproturon herbicide over TiO₂/Al-MCM-41 composite systems using solar light

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• 作者：M.V. Phanikrishna Sharma ; V. Durga Kumari ; M. Subrahmanyam
• 关键词：TiO₂ ; Al-MCM-41 ; Photocatalytic degradation ; Isoproturon ; Mineralization
• 刊名：Chemosphere
• 出版年：2008
• 期刊代码：15_00456535
• 类别：env
• 出版时间：June 2008
• 卷：72
• 期：4
• 页码：644-651
• 文件大小：323 K

摘要

Version française abrégée — Dégradation photocatalytique de pesticides dans des eaux polluées d'origine agricole. Plusieurs types de pesticides organiques peuvent être aisément détruits et totalement minéralisés à température ambiante par voie photocatalytique, en utilisant TiO₂ comme photocatalyseur. Dans le présent travail, nous avons déterminé l'influence de différents paramètres qui gouvernent l'activité, ainsi que l'identité des intermédiaires réactionnels permettant d'établir les chemins réactionnels dans des solutions modèles et dans des solutions réelles provenant d'eaux de rinçage de matériel agricole. Divers pesticides, intensément utilisés en agriculture, tels que l'herbicide 2,4-D (dichloro-phenoxy-acetic acid) ou des insecticides (tetrachlorvinphos, fenitrothion, pirimiphos-methyl, fenamiphos) ont été dégradés, soit sous forme d'agents actifs purs, soit formulés dans des produits commerciaux. Un effet bénéfique de synergie a pu être mis en évidence en ajoutant du charbon actif a TiO₂. Nous avons étendu notre étude à l'héliophotocatalyse en utilisant le photoréacteur solaire pilote de la « Plataforma Solar de Almeria » du CIEMAT (Espagne).iv>iv>
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ience?_ob=ArticleURL&_udi=B6TGM-4D8MM4Y-3&_user=10&_origUdi=B6V74-4S7HS85-4&_fmt=high&_coverDate=11%2F15%2F2004&_rdoc=1&_orig=article&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=ea038720cdd1b94e0aa5f0e69b75a330" onMouseOver="InfoBubble.show('infobubble_2','mlktLink_2')" onMouseOut="InfoBubble.timeout()">Effect of the solvent in the liquid phase rearrangement... <i>Journal of Molecular Catalysis A: Chemicali>

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iv style="float:right; padding-left:5px">ick="InfoBubble.hide()"><img src="/scidirimg/btn_xclose.gif" alt="Close" title="Close" onmouseover="javascript:this.src='/scidirimg/btn_xclose_hov.gif';" onmouseout="javascript:this.src='/scidirimg/btn_xclose.gif';">iv><img border=0 src="/scidirimg/jrn_nsub.gif" alt="You are not entitled to access the full text of this document" title="You are not entitled to access the full text of this document" width=12 height=14"> iencedirect.com/science?_ob=ArticleURL&_udi=B6TGM-4D8MM4Y-3&_user=10&_coverDate=11%2F15%2F2004&_rdoc=1&_fmt=high&_orig=article&_cdi=5258&_sort=v&_docanchor=&view=c&_ct=5549&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=5226e06bb72bd0b32f7639d763355690">Effect of the solvent in the liquid phase rearrangement of 1,2-epoxyoctane over Al-MCM-41 and Al-TS-1 catalysts <i>Journal of Molecular Catalysis A: Chemicali>, <i>Volume 222, Issues 1-2i>, <i>15 November 2004i>, <i>Pages 167-174i> Rafael van Grieken, David P. Serrano, Juan Antonio Melero, Alicia Garc&#xed;a Abstract iv class="mlktScroll">iv style="line-height:150%"> Graphical abstract Effect of solvent nature in the catalytic performance of Al-containing zeolitic and mesostructured materials in the liquid phase rearrangement of 1,2-epoxyoctane is reported. The solvent polarity influences strongly on the activity and selectivity. <img src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TGM-4D8MM4Y-3-2/0?wchp=dGLbVlW-zSkWz" class="charImg" alt="image" title="image" height="57" width="125"> The role of solvent nature in the liquid phase rearrangement of 1,2-epoxyoctane over Al-TS-1 and Al-MCM-41 catalysts is reported. The main reaction product is the aldehyde, while other rearrangement products, mainly allylic alcohols and diol are obtained. The solvent polarity influences strongly on the activity and product selectivity. The catalytic activity decreases with the increasing of solvent polarity especially for Al-MCM-41 materials. The use of acetonitrile as solvent yields a low conversion of epoxide as a consequence of its basic character. Formation of bulky by-products was detected when dimethylcarbonate was used as solvent over Al-MCM-41. Toluene displays the best catalytic performance in regards to activity and selectivity towards valuable products, with both Al-TS-1 and Al-MCM-41 catalysts, in comparison to those obtained with more polar solvents.iv>iv> iencedirect.com/science?_ob=MImg&_imagekey=B6TGM-4D8MM4Y-3-F&_cdi=5258&_user=10&_orig=article&_coverDate=11%2F15%2F2004&_sk=997779998&view=c&wchp=dGLbVlW-zSkWz&md5=3c6aca4f706f8939380d7a191213d0d9&ie=/sdarticle.pdf"><img name="pdf" style="vertical-align:absmiddle;" border="0" src="http://www.sciencedirect.com/scidirimg/icon_pdf.gif" alt=""> Purchase PDF (229 K)

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ience?_ob=ArticleURL&_udi=B6TGY-4C6KT6P-1&_user=10&_origUdi=B6V74-4S7HS85-4&_fmt=high&_coverDate=07%2F15%2F2004&_rdoc=1&_orig=article&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=979feb132cfbbffc2434ffb66bb6f43e" onMouseOver="InfoBubble.show('infobubble_3','mlktLink_3')" onMouseOut="InfoBubble.timeout()">Visible light induced photocatalytic activity for degra... <i>Journal of Photochemistry and Photobiology A: Chemistryi>

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iv style="float:right; padding-left:5px">ick="InfoBubble.hide()"><img src="/scidirimg/btn_xclose.gif" alt="Close" title="Close" onmouseover="javascript:this.src='/scidirimg/btn_xclose_hov.gif';" onmouseout="javascript:this.src='/scidirimg/btn_xclose.gif';">iv><img border=0 src="/scidirimg/jrn_nsub.gif" alt="You are not entitled to access the full text of this document" title="You are not entitled to access the full text of this document" width=12 height=14"> iencedirect.com/science?_ob=ArticleURL&_udi=B6TGY-4C6KT6P-1&_user=10&_coverDate=07%2F15%2F2004&_rdoc=1&_fmt=high&_orig=article&_cdi=5267&_sort=v&_docanchor=&view=c&_ct=5549&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=b7043d4b22b54c8fda8974493e887630">Visible light induced photocatalytic activity for degradation of acetaldehyde using transition metal incorporated Al-MCM-41 (aluminum doped silica zeolitic material) <i>Journal of Photochemistry and Photobiology A: Chemistryi>, <i>Volume 165, Issues 1-3i>, <i>15 July 2004i>, <i>Pages 51-58i> Shalini Rodrigues, S. Uma, Igor N. Martyanov, K. J. Klabunde Abstract iv class="mlktScroll">iv style="line-height:150%">Transition metal aluminosilicates (M-Al-MCM-41) with high surface area were analyzed for photocatalytic degradation of acetaldehyde in the gas phase. The photoactivity of the catalyst under visible light irradiation is independent of the loading level of Co ions in the Co-Al-MCM-41 framework. The physical state of the transition metal oxide was characterized by XRD, IR, and diffuse reflectance studies. A high surface area with average pore diameter of 2.5 nm was obtained from BET adsorption studies. Maximal photoactivity was achieved even at low loading levels of the transition metal ion. These catalysts also exhibit good activity for degradation of acetaldehyde in the gas phase under UV light illumination.iv>iv> iencedirect.com/science?_ob=MImg&_imagekey=B6TGY-4C6KT6P-1-10&_cdi=5267&_user=10&_orig=article&_coverDate=07%2F15%2F2004&_sk=998349998&view=c&wchp=dGLbVlW-zSkWz&md5=0a1ff45447fbd8a39e5ea8734ba975a0&ie=/sdarticle.pdf"><img name="pdf" style="vertical-align:absmiddle;" border="0" src="http://www.sciencedirect.com/scidirimg/icon_pdf.gif" alt=""> Purchase PDF (164 K)

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Photocatalytic degradation of isoproturon herbicide over TiO₂/Al-MCM-41 composite systems using solar light