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Photocatalytic mineralization of anionic dyes using bismuth doped CdS-Ta2O5 composite

机译:使用铋掺杂Cds-Ta2O5复合材料的阴离子染料光催化矿化

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摘要

A stable and efficient bismuth doped CdS-Ta2O5 heterostructured system is synthesized for the photocatalytic degradation of anionic dyes like acid violet 7, indigo carmine and methyl orange. This composite is found to be effective not only for the degradation but also for the mineralization of these dyes under sunlight type irradiation. Bi doping improves the optical absorption property and enhances the visible light absorption. In this composite, CdS exists as the hexagonal wurtzite structure and Ta2O5 has an orthorhombic structure. Increased fluorescence lifetime is observed for the charge carriers in the composite sample compared to CdS due to the efficient charge separation occurring in this system. The enhanced photocatalytic activity of the composite system arises due to the improved optical absorption properties and increased life time of the photogenerated charge carriers. This heterostructured catalyst is found to be photostable and reusable. Photocatalytic degradation experiments with different quenchers suggest that hydroxyl radicals (OH center dot), superoxide anion radicals (O-2(center dot-)) and photogenerated holes (h(+)) play significant roles in the mineralization process.
机译:稳定,高效的铋掺杂的CdS-Ta2O5异质结构系统是为阴离子染料等酸性紫7,靛蓝胭脂红和甲基橙光催化降解合成。此复合材料被发现不仅对降解也为日光型照射下这些染料的矿化是有效的。 Bi掺杂改善了光吸收特性并且提高了可见光的吸收。在这种复合材料,硫化镉存在作为六方纤锌矿结构和Ta2O5具有正交结构。增加荧光寿命是观察复合样品中的电荷载流子相比硫化镉由于在该系统中发生的有效的电荷分离。复合系统的增强的光催化活性的出现是由于改进的光吸收特性和光生电荷载流子的增加的寿命时间。这种异质催化剂被发现是光稳定的和可重复使用。用不同的猝灭剂光催化降解实验表明,羟基自由基(OH中心点),超氧化物阴离子自由基(O-2(中心点状))和光生空穴(h(+))在矿化过程中发挥显著作用。

著录项

  • 来源
    《RSC Advances》 |2015年第78期|共8页
  • 作者单位

    Visvesvaraya Natl Inst Technol Dept Chem Nagpur 440010 Maharashtra India;

    Visvesvaraya Natl Inst Technol Dept Chem Nagpur 440010 Maharashtra India;

    Bhabha Atom Res Ctr Trombay Div Chem Bombay 400085 Maharashtra India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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