Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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New Synthesis of the Ternary Type Bi2WO6-GO-TiO2 Nanocomposites by the Hydrothermal Method for the Improvement of the Photo-catalytic Effect

개선된 광촉매 효과를 위한 수열법에 의한 삼원계 Bi2WO6-GO-TiO2 나노복합체의 쉬운 합성 방법

  • Nguyen, Dinh Cung Tien (Department of Advanced Materials Science & Engineering, Hanseo University) ;
  • Cho, Kwang Youn (Korea Institutes of Ceramic Engineering and Technology) ;
  • Oh, Won-Chun (Department of Advanced Materials Science & Engineering, Hanseo University)
  • Received : 2017.05.15
  • Accepted : 2017.10.23
  • Published : 2017.12.10
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Abstract

A novel material, $Bi_2WO_6-GO-TiO_2$ composite, was successfully synthesized using a facile hydrothermal method. During the hydrothermal reaction, the loading of $Bi_2WO_6$ and $TiO_2$ nanoparticles onto graphene sheets was achieved. The obtained $Bi_2WO_{6-GO-TiO2}$ composite photo-catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), Raman spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy (UV-vis-DRS), and X-ray photoelectron spectroscopy (XPS). The $Bi_2WO_6$ nanoparticle showed an irregular dark-square block nanoplate shape, while $TiO_2$ nanoparticles covered the surface of the graphene sheets with a quantum dot size. The degradation of rhodamine B (RhB), methylene blue trihydrate (MB), and reactive black B (RBB) dyes in an aqueous solution with different initial amount of catalysts was observed by UV spectrophotometry after measuring the decrease in the concentration. As a result, the $Bi_2WO_6-GO-TiO_2$ composite showed good decolorization activity with MB solution under visible light. The $Bi_2WO_6-GO-TiO_2$ composite is expected to become a new potential material for decolorization activity. Photocatalytic reactions with different photocatalysts were explained by the Langmuir-Hinshelwood model and a band theory.

독창적 물질인 $Bi_2WO_6-GO-TiO_2$ 나노복합체를 쉬운 수열법에 의해 성공적으로 합성하였다. 수열반응을 하는 동안, 그래핀 시트 위에 $Bi_2WO_6$와 $TiO_2$를 도포하였다. 합성한 $Bi_2WO_6-GO-TiO_2$ 복합체형 광촉매는 X-선 회절법(XRD), 주사전자현미경(SEM), 에너지 분산 X-선(EDX) 분석, 투과전자현미경(TEM), 라만분광법, UV-Vis 확산반사 분광법(UV-vis-DRS), 및 X-선 광전자분광기(XPS)에 의하여 특성화하였다. $Bi_2WO_6$ 나노입자는 불규칙한 dark-square block 나노 플페이트 형상을 보였으며, 이산화티탄 나노입자는 퀜텀 도트 사이즈로 그래핀 시트 위 표면을 덮고 있었다. 로다민 비의 분해는 농도감소의 측정과 함께 UV 분광법에 의하여 관찰하였다. 합성된 물질의 광촉매 반응은 Langmuir-Hinshelwood 모델과 띠 이론으로 설명하였다.

Keywords

References

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