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首页> 外文期刊>Environmental Science & Technology >Design of BDD-TiO_2 Hybrid Electrode with P-N Function for Photoelectroatalytic Degradation of Organic Contaminants
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Design of BDD-TiO_2 Hybrid Electrode with P-N Function for Photoelectroatalytic Degradation of Organic Contaminants

机译：具有P-N功能的BDD-TiO_2杂化电极光电降解有机污染物的设计

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摘要

P-N hybrid electrode of boron-doped diamond (BDD) and TiO_2 were designed and fabricated via selective deposition of TiO_2 onto BDD electrode. This hybrid electrode exhibit high photoelectrocatalytic activities toward degradation of acid orange II (AOII) and 2, 4-dichloropheonl (2, 4-DCP) due to the P-N effect and high electrocatalytic and photocatalytic activities of BDD electrode and TiO_2 particles. The structures of TiO_2 and BDD were confirmed by Raman spectra analysis. Atom force microscopy and scanning electron microscopy showed that the TiO_2 deposits consist of adherent nanomicro-sized particles, scattered on the BDD substrate. AOII and 2,4-DCP in a solution can be efficiently degraded at the hybrid electrode in the photoelectrocatalysis (PEC) process. Effect of applied bias potentials and solution pH values on AOII and 2,4-DCP degradation were investigated. In the electro-oxidation process, some intermediates such as phenols were detected and they accumulated with the reaction evolution based on the analysis of UV-vis and GC-MS variation. By contrast, phenols intermediates will be degraded with the reaction evolution in the photoelectrocatalysis process. And, organic aromatic and aliphatic carboxylic acids were detected. Furthermore, different degradation mechanism of AOII and 2,4-DCP in the electro-oxidation, photocatalysis, and photoelectrocatalysis is proposed.
机译：通过选择性沉积TiO_2到BDD电极上，设计了掺硼金刚石（BDD）和TiO_2的P-N杂化电极。该杂化电极由于P-N效应以及BDD电极和TiO_2颗粒的高电催化和光催化活性，对酸橙II（AOII）和2，4-二氯苯酚（2，4-DCP）的降解表现出很高的光电催化活性。通过拉曼光谱分析证实了TiO_2和BDD的结构。原子力显微镜和扫描电子显微镜显示，TiO_2沉积物由分散在BDD基底上的纳米纳米颗粒组成。溶液中的AOII和2,4-DCP可以在光电催化（PEC）过程中在混合电极上有效降解。研究了施加偏压和溶液pH值对AOII和2,4-DCP降解的影响。在电氧化过程中，基于紫外可见光谱和GC-MS的变化分析，检测到一些中间体，例如苯酚，并随着反应的进行而积累。相反，在光电催化过程中，酚中间体会随着反应的发展而降解。并且，检测到有机芳族和脂族羧酸。此外，提出了在电氧化，光催化和光电催化中AOII和2,4-DCP的不同降解机理。

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  • 来源
    《Environmental Science & Technology》 |2008年第13期|4934-4939|共6页
  • 作者

    JIUHUI QU; XU ZHAO;

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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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