• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Fullerol–Titania Charge-Transfer-Mediated Photocatalysis Working underVisible Light
【24h】

Fullerol–Titania Charge-Transfer-Mediated Photocatalysis Working underVisible Light

机译：富勒罗尔-二氧化钛电荷转移介导的光催化在可见光下工作

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The development of visible-light-active photocatalysts is being in-vestigated through various approaches.In this study, C_(60)-based sensitized pho-tocatalysis that works through thecharge transfer (CT) mechanism is pro-posed and tested as a new approach.By employing the water-soluble fullerol(C_(60)(OH)_,x) instead of C_(60),we demon-strate that the adsorbed fullerol acti-vates TiO_2under visible-light irradia-tion through the "surface-complexCT" mechanism, which is largelyabsent in the C_(60)/TiO_2system. Al-though fullerene and its derivativeshave often been utilized in TiO_2-basedphotochemical conversion systems asan electron transfer relay, their success-ful photocatalytic application as a visi-ble-light sensitizer of TiO_2 is not wellestablished. Fullerol/TiO_2exhibitsmarked visible photocatalytic activitynot only for the redox conversion of 4-chlorophenol, I-, and Cr~(VI),but also forH_2production. The photoelectrode offullerol/TiO_2also generates an en-hanced anodic photocurrent under visi-ble light as compared with the electro-des of bare TiO_2and C_(60)/TiO_2, whichconfirms that the visible-light-inducedelectron transfer from fullerol to TiO_2 is particularly enhanced. The surfacecomplexation of fullerol/TiO_2induceda visible absorption band around 400-500 nm, which was extinguished whenthe adsorption of fullerol was inhibitedby fluorination of the surface of TiO_2.The transient absorption spectroscopicmeasurement gave an absorption spec-trum ascribed to fullerol radical cations(funeral~+) the generation of whichshould be accompanied by the pro-posed CT. The theoretical calculationregarding the absorption spectra forthe (TiO_2cluster +fullerol) model alsoconfirmed the proposed CT, which in-volves excitation from HOMO (full-erol) to LUMO (TiO_2 cluster) as theorigin of the visible-light absorption.
机译：可见光活性光催化剂的开发正通过各种方法进行研究。在这项研究中，提出并通过电荷转移（CT）机制起作用的基于C_（60）的敏化光催化被提出并进行了测试。通过使用水溶性富勒醇（C_（60）（OH）_，x）代替C_（60），我们证明了可见光在“表面”下吸附的富勒醇活化了TiO_2。 -complexCT”机制，这在C_（60）/ TiO_2系统中基本不存在。尽管富勒烯及其衍生物虽然经常在基于TiO_2的光化学转化系统中用作电子转移继电器，但它们作为TiO_2的可见光敏化剂的成功光催化应用仍未得到很好的确立。富勒醇/ TiO_2不仅对4-氯苯酚，I-和Cr〜（VI）的氧化还原转化具有显着的可见光催化活性，而且对H_2的产生也具有明显的光催化活性。与裸露的TiO_2和C_（60）/ TiO_2的电极相比，富勒醇/ TiO_2的光电极在可见光下还产生增强的阳极光电流，这证实了可见光诱导的电子从富勒醇向TiO_2的转移特别有效。 。富勒醇/ TiO_2的表面络合引起约400-500 nm的可见吸收带，当TiO_2表面氟化导致富勒醇的吸附被抑制时，可见吸收带消失。瞬态吸收光谱法测定了富勒醇自由基阳离子（（~~ ）的产生应伴随提议的CT。关于（TiO 2簇+富勒醇）模型的吸收光谱的理论计算也证实了所提出的CT，其涉及从HOMO（完全紫醇）到LUMO（TiO 2簇）的激发作为可见光吸收的起源。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号