Effect of Platinum Deposits on Ti0_2 on the Anoxic Photocatalytic Degradation Pathways of Alkylamines in Water:Dealkylation and N-Alkylation

Richard S.Blackburn; Anna harvey

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Effect of Platinum Deposits on Ti0_2 on the Anoxic Photocatalytic Degradation Pathways of Alkylamines in Water:Dealkylation and N-Alkylation

机译：Effect of Platinum Deposits on Ti0_2 on the Anoxic Photocatalytic Degradation Pathways of Alkylamines in Water:Dealkylation and N-Alkylation

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Most photocatalytic degradation(PCD)reactions of aquatic pollutants require the presence of dissolved oxygen and hence do not occur in anoxic suspensions.We investigated the PCD reactions of alkylamines in anoxic water using Ti0_2 deposited with Pt nanoparticles.Unlike typical PCD reactions,the absence of dissolved oxygen increases the PCD rates of alkylamines on Pt/Ti0_2 and generates products that are different from those formed on pure Ti0_2.In particular,N-alkylated amines(e.g.,(CH_3)_3N produced from(CH_3)_2NH)as well as dealkylated amines are generated in a deaerated Pt/Ti0_2 suspension.This anoxic N-alkylation pathway is enabled only in the presence of Pt deposits on Ti0_2 and is applicable only to neutral alkylamines and not to alkylammonium cations.The Pt surface appears to interact with the lone-pair electron on the N atom and catalyze the anoxic degradation of alkylamines mainly through a radical mechanism.Methyl radicals generated on Pt participate in the N-methylation reaction.The presence of intermediate methyl radicals on the Pt surface was verified by the detection of CH_4 and CH_3CH_3 gases evolved during the PCD of(CH_3)_3N in an anoxic Pt/Ti0_2 suspension,whereas no such products were observed in a pure Ti0_2 suspension.The anoxic PCD of N-methylethylamine on Pt/Ti0_2 also produces both N-ethylated and N-methylated amines as byproducts,which indicates that both methyl and ethyl radicals are generated during the anoxic degradation process.From a practical point of view,the present finding that undesirable alkylated amines can be produced on Pt/Ti0_2 in anoxic conditions indicates that caution is necessary when applying Pt/Ti0_2 photocatalyst to the treatment of water that contains amines.

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《Environmental Science & Technology: ES&T》 |2004年第14期|4026-4033|共8页
作者
Richard S.Blackburn; Anna harvey;
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作者单位

School of Environmental Science and Engineering,Pohang University of Science and Technology,Pohang 790-784,Korea;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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正文语种英语
中图分类环境化学;
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Effect of Platinum Deposits on Ti0_2 on the Anoxic Photocatalytic Degradation Pathways of Alkylamines in Water:Dealkylation and N-Alkylation

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