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Enhanced photocatalytic activity in porphyrin-sensitized Ti02 nanorods

机译：卟啉敏化的TiO2纳米棒中增强的光催化活性

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摘要

Two novel porphyrins (5,10,15,20-tetra(3-(carboethoxymethyleneoxy)phenyl)porphyrin, H2TEPp and 5,10,15,20-tetra(3-(carboxymethyleneoxy)phenyl)porphyrin, H_2TCPp) and their copper(II) porphyrins (CuTEPp, CuTCPp) were synthesized. With these porphyrins, four new porphyrin-sensitized TiO_2 nanorod composites (H_2TEPp/TiO_2, H_2TCPp/TiO_2, CuTEPp/TiO_2, and CuTCPp/ TiO_2) were prepared and characterized by methods of XRD, SEM, TEM, FT-IR, UV-vis DRS, nitrogen adsorption-desorption and fluorescence spectra. Besides, the photocatalytic activity and stability of the composites were assessed in the degradation of 4-nitrophenol (4-NP). The results indicate that the morphologies and structures of these composites are less influenced by the loaded porphyrins or copper porphyrins compared with the nanorods TiO_2 (anatase). The porphyrin or copper porphyrin molecules are confirmed to bond on the surface of TiO_2 through carboxyl group, which is beneficial to the electron transfer between porphyrin and TiO_2. All composites exhibit enhanced photoactivities compared with the bare TiO_2 nanorods. The possible reason is that the recombination of photoproduced electron-hole has been controlled effectively in these composites, which can be seen from their decreased fluorescence emission. The stability results of composites show that they still hold considerable photocatalytic activities after six cycling experiments.
机译：两种新型卟啉（5,10,15,20-四（3-（羧乙氧基亚甲基氧基）苯基）卟啉H2TEPp和5,10,15,20-四（3-（羧甲氧基亚氧基）苯基）卟啉H_2TCPp）及其铜（ II）合成了卟啉（CuTEPp，CuTCPp）。利用这些卟啉，制备了四种新型的卟啉敏化的TiO_2纳米棒复合材料（H_2TEPp / TiO_2，H_2TCPp / TiO_2，CuTEPp / TiO_2和CuTCPp / TiO_2），并通过XRD，SEM，TEM，FT-IR，UV-vis等方法进行了表征。 DRS，氮吸附-解吸和荧光光谱。此外，在4-硝基苯酚（4-NP）的降解中评估了复合材料的光催化活性和稳定性。结果表明，与纳米棒TiO_2（锐钛矿）相比，这些复合材料的形貌和结构受负载的卟啉或铜卟啉的影响较小。证实卟啉或铜卟啉分子通过羧基键合在TiO_2表面上，这有利于卟啉与TiO_2之间的电子转移。与裸露的TiO_2纳米棒相比，所有复合材料均表现出增强的光活性。可能的原因是这些复合物中已有效控制了光生电子空穴的复合，这可以从其荧光发射减少看出。复合材料的稳定性结果表明，经过六个循环实验，它们仍然具有相当大的光催化活性。

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  • 来源
    《Journal of Materials Research》 |2017年第14期|2773-2780|共8页
  • 作者

    Wei Zhang; Chen Wang; Xiao Liu; Jun Li;

  • 作者单位

    Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, School of Chemistry & Materials Science, Northwest University, Xi'an, Shaanxi 710069, China;

    School of Chemical Engineering, Northwest University, Xi'an, Shaanxi 710069, People's Republic of China;

    Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, School of Chemistry & Materials Science, Northwest University, Xi'an, Shaanxi 710069, China;

    Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, School of Chemistry & Materials Science, Northwest University, Xi'an, Shaanxi 710069, China;

  • 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);
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