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Enhanced catalytic performance of reduced graphene oxide-TiO2 hybrids for efficient water treatment using microwave irradiation

机译：增强石墨烯氧化钛-TiO2杂种的催化性能，用于使用微波辐射有效水处理

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摘要

Towards achieving efficient waste water treatment, the degradation of a common water pollutant, Orange G azo dye, was studied using a new hybrid catalyst and microwave irradiation. The fabrication of a hybrid catalyst based on reduced graphene oxide-titania (rGO-TiO2), was first achieved in a single mode microwave cavity by reducing the precursor consisting of graphene oxide (GO) and titania. Catalytic performance was then assessed in both microwave assisted and conventional heat treatment conditions. The hybrid catalyst showed significant improvement under microwave irradiation, with more than 88% dye degradation after 20 minutes of treatment at 120 degrees C. The microwave effect was found to be more dominant in the early stages of the catalysis - the hybrid catalyst decomposed similar to 65% of the dye in just 5 minutes of microwave treatment compared to only 18% degradation obtained during conventional heating. The improved performance with microwaves is mainly attributed to the formation of the hot spots at the surface of the hybrid catalyst which ultimately results in higher degradation rates. The morphological and catalytic properties of the hybrid catalyst are investigated using High Resolution Transmission Electron Microscopy (HRTEM) and UV-Vis Spectroscopy, respectively. Successful reduction of GO to rGO was confirmed using Raman spectroscopy and X-ray diffraction. The outstanding performance of microwave irradiated hybrids offers a viable low energy, low carbon footprint process with a new catalyst for wastewater treatment and for highly polluted wastewater conditions where photocatalysis is deemed not feasible.
机译：为了实现高效的废水处理，使用新的杂交催化剂和微波辐射研究了普通水污染物，橙G偶氮染料的降解。通过减少由石墨烯（GO）和二氧化钛组成的前体，首先在单模微波腔中制造杂化催化剂的制备首先在单模微波腔内实现。然后在微波辅助和常规热处理条件下评估催化性能。杂交催化剂在微波辐射下显示出显着的改善，在120℃下处理20分钟后，在20℃下处理超过88％的染料降解。发现微波效应在催化的早期阶段更大 - 混合催化剂类似于在常规加热期间，仅5分钟的微波处理中仅为5分钟的微波处理中的染料65％。具有微波的改进性能主要归因于混合催化剂表面的热点，最终导致更高的降解速率。使用高分辨率透射电子显微镜（HRTEM）和UV-Vis光谱研究了杂化催化剂的形态学和催化性能。使用拉曼光谱和X射线衍射确认转到rgo的成功减少。微波照射杂种的出色性能具有可行的低能量，具有新的废水处理催化剂的可行性低能量，低碳占地面积，以及用于光催化的高度污染的废水条件不可行。

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  • 来源
    《RSC Advances》 |2018年第14期|共7页
  • 作者

    Anshuman Aashu; Saremi-Yarahmadi Sina; Vaidhyanathan Bala;

  • 作者单位

    Loughborough Univ Dept Mat Loughborough LE11 3TU Leics England;

    Loughborough Univ Dept Mat Loughborough LE11 3TU Leics England;

    Loughborough Univ Dept Mat Loughborough LE11 3TU Leics England;

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