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首页> 外文期刊>Applied Surface Science >Enhanced photocatalytic performance of Hemin (chloro(protoporhyinato)iron(III)) anchored TiO_2 photocatalyst for methyl orange degradation: A surface modification method
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Enhanced photocatalytic performance of Hemin (chloro(protoporhyinato)iron(III)) anchored TiO_2 photocatalyst for methyl orange degradation: A surface modification method

机译：一种表面修饰方法，提高了Hemin（氯（原卟啉）铁（III））锚定的TiO_2光催化剂对甲基橙降解的光催化性能。

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摘要

TiO_2 was prepared by sol-gel method through the hydrolysis of TiCl_4 and its surface derivatization was carried out with molecular catalyst like Hemin (chloro(protoporhyinato)iron(III)). Catalyst was characterized by various analytical techniques like UV-vis spectroscopy, FT-IR, FE-SEM and XRD. The anchoring of Hemin on titania surface is confirmed by FT-IR spectra through the linkage of O=C-O-Ti bond and also by TGA-DSC and elemental analysis. The photocatalytic activity of the surface modified catalyst is tested for the degradation of methyl orange (MO) as a model compound under UV light. The Hemin impregnated TiO_2 (H-TiO_2) in presence of H_2O_2 shows an excellent photocatalytic activity compared to pristine TiO_2, Hemin, H_2O_2, TiO_2 /H_2O_2, and Hemin/H_2O_2 systems. The enhancement in the photocatalytic activity is attributed to the presence of iron (III) porphyrin ring on the TiO_2 surface, which reduces the electron-hole recombination rate and also by acting as a mediator for continuous production of enriched concentration of hydroxyl radicals along with various other reactive free radicals.
机译：TiO_2是通过溶胶-凝胶法通过水解TiCl_4而制备的，其表面衍生作用是通过分子催化剂如Hemin（氯代（原卟啉）铁（III））进行的。催化剂通过各种分析技术进行表征，例如紫外可见光谱，FT-IR，FE-SEM和XRD。 Hemin在二氧化钛表面上的锚固通过FT-IR光谱通过O = C-O-Ti键的连接以及TGA-DSC和元素分析得到证实。测试了表面改性催化剂的光催化活性，以分析在紫外光下作为模型化合物的甲基橙（MO）的降解情况。与原始TiO_2，Hemin，H_2O_2，TiO_2 / H_2O_2和Hemin / H_2O_2体系相比，在H_2O_2存在下用Hemin浸渍的TiO_2（H-TiO_2）表现出优异的光催化活性。光催化活性的提高归因于TiO_2表面上的铁（III）卟啉环的存在，这降低了电子-空穴的复合率，并且还充当了连续产生富集浓度的羟基自由基以及各种不同形式的介质的媒介。其他反应性自由基。

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  • 来源
    《Applied Surface Science》 |2013年第1期|521-528|共8页
  • 作者

    L. Gomathi Devi; M.L. ArunaKumari;

  • 作者单位

    Department of Post Graduate Studies in Chemistry, Central College City Campus, Dr. Ambedkar Street, Bangalore University, Bangalore 560007, India;

    Department of Post Graduate Studies in Chemistry, Central College City Campus, Dr. Ambedkar Street, Bangalore University, Bangalore 560007, India;

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  • 正文语种 eng
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  • 关键词

    Hemin; Methyl orange; Hemin anchored TiO_2; Surface derivatization;

    机译：赫敏甲基橙;血红素锚定的TiO_2;表面衍生化;

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