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首页> 外文期刊>RSC Advances >Synthesis and characterization of carbon microtube/tantalum oxide composites and their photocatalytic activity under visible irradiation
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Synthesis and characterization of carbon microtube/tantalum oxide composites and their photocatalytic activity under visible irradiation

机译：可见辐照下碳微管/钽氧化物复合材料及其光催化活性的合成与表征

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摘要

Carbon microtubes (CMTs) were synthesized by the combustion of cotton fibers in an open air atmosphere at an optimized temperature. The combustion of the cotton fibers leads to the formation of CMTs by a self rolling approach. In situ synthesis of the CMT : Ta2O5 composite was done in an alkaline ethanolic medium. The formation of the CMTs and composites was characterized by RAMAN, DRS/UV-Visible, FTIR, XPS, XRD, BET, N-2-adsorption isotherms, FESEM/EDX, TEM/EDX and particle size analysis. The composites were effectively employed in the photo oxidation of xylenol orange (XO) and methyl orange (MO). The composites catalytic activity and the adsorbed dyes removal percentage were determined by a spectrophotometric method. The CMT : Ta2O5 composites attained a higher photocatalytic activity due to the formation of nascent oxygen during degradation, which enhances the photocatalytic performance. The kinetic parameters obey the pseudo-first order reaction, which may be due to the constant amount of the catalyst and the concentration of the dye solution. The catalytic activity of the recycled composites was compared with the catalytic activity of the fresh catalyst.
机译：碳微管（CMTS）通过棉纤维的在一个开放的空气气氛中燃烧以优化的温度合成。棉纤维导致的CMTS形成一个自我滚动的方式燃烧。在CMT的原位合成：Ta2O5复合物在碱性乙醇介质完成。在CMTS和复合材料的形成的特点是RAMAN，DRS /紫外 - 可见，红外光谱，XPS，XRD，BET，N-2-吸附等温线，FESEM / EDX，TEM / EDX和颗粒尺寸分析。该复合材料在二甲酚橙（XO）和甲基橙（MO）的光氧化被有效地使用。该复合材料的催化活性和所吸附的染料去除百分比由分光光度方法测定。的CMT：Ta2O5复合材料获得更高的光催化活性因初生态氧的降解过程中形成，这提高了光催化性能。动力学参数服从假一级反应，这可能是由于催化剂的恒定量和染料溶液的浓度。再循环复合材料的催化活性与新鲜催化剂的催化活性进行比较。

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  • 来源
    《RSC Advances》 |2015年第69期|共10页
  • 作者

    Chennakesavulu K.; Reddy G. Ramanjaneya;

  • 作者单位

    Sathyabama Univ Dept Chem Madras 600119 Tamil Nadu India;

    Univ Madras Dept Inorgan Chem Madras 600025 Tamil Nadu India;

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  • 正文语种 eng
  • 中图分类 化学;
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