Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Study on Synthesis and Characterization of Magnetic ZnFe2O4@SnO2@TiO2 Core-shell Nanoparticles

자성을 가진 ZnFe2O4@SnO2@TiO2 Core-Shell Nanoparticles의 합성과 특성에 관한 연구

  • Yoo, Jeong-yeol (Department of Chemistry, College of Natural Science, Dankook University) ;
  • Park, Seon-A (Department of Chemistry, College of Natural Science, Dankook University) ;
  • Jung, Woon-Ho (Department of Chemistry, College of Natural Science, Dankook University) ;
  • Park, Seong-Min (Department of Chemistry, College of Natural Science, Dankook University) ;
  • Tae, Gun-Sik (Department of biology, College of Natural Science, Dankook University) ;
  • Kim, Jong-Gyu (Department of Chemistry, College of Natural Science, Dankook University)
  • 유정열 (단국대학교 자연과학대학 화학과) ;
  • 박선아 (단국대학교 자연과학대학 화학과) ;
  • 정운호 (단국대학교 자연과학대학 화학과) ;
  • 박성민 (단국대학교 자연과학대학 화학과) ;
  • 태건식 (단국대학교 자연과학대학 생명과학과) ;
  • 김종규 (단국대학교 자연과학대학 화학과)
  • Received : 2018.06.07
  • Accepted : 2018.08.30
  • Published : 2018.12.10
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Abstract

In this study, $ZnFe_2O_4@SnO_2@TiO_2$ core-shell nanoparticles (NPs), a photocatalytic material with magnetic properties, were synthesized through a three-step process. Structural properties were investigated using X-ray diffraction (XRD) analysis. It was confirmed that $ZnFe_2O_4$ of the spinel, $SnO_2$ of the tetragonal and $TiO_2$ of the anatase structure were synthesized. The magnetic properties of synthesized materials were studied by a vibrating sample magnetometer (VSM). The saturation magnetization value of $ZnFe_2O_4$, a core material, was confirmed at 33.084 emu/g. As a result of the formation of $SnO_2$ and $TiO_2$ layers, the magnetism due to the increase in thickness was reduced by 33% and 40%, respectively, but sufficient magnetic properties were reserved. The photocatalytic efficiency of synthesized materials was measured using methylene blue (MB). The efficiency of the core material was about 4.2%, and as a result of the formation of $SnO_2$ and $TiO_2$ shell, it increased to 73% and 96%, respectively while maintaining a high photocatalytic efficiency. In addition, the antibacterial activity was validated via the inhibition zone by using E. Coli and S. Aureus. The formation of shells resulted in a wider inhibition zone, which is in good agreement with photocatalytic efficiency measurements.

본 연구에서는 자성을 이용하여 재수득이 가능한 광 촉매 물질인 $ZnFe_2O_4@SnO_2@TiO_2$ core-shell nanoparticles (NPs)를 3단계 과정을 통해 합성하였다. 구조적 특성은 X-ray diffraction (XRD) 분석으로 확인하였다. Spinel 구조의 $ZnFe_2O_4$와 tetragonal 구조의 $SnO_2$와 anatase 구조의 $TiO_2$가 합성된 것을 확인하였다. 합성한 물질의 자기적 성질은 vibrating sample magnetometer (VSM)으로 확인하였다. Core 물질인 $ZnFe_2O_4$의 포화자화 값은 33.084 emu/g으로 확인하였다. $SnO_2$와 $TiO_2$층의 형성의 결과, 두께 증가로 인한 자성은 각각 33, 40% 감소하였으나 재수득이 가능한 충분한 자성을 가지는 것을 확인하였다. 합성된 물질의 광 촉매 효율은 methylene blue (MB)를 사용하여 측정하였다. Core 물질의 효율은 4.2%로 확인하였고 $SnO_2$와 $TiO_2$ shell 형성의 결과 각각 73%와 96%로 증가하였고 높은 광 촉매 효율을 가지는 것을 확인하였다. 또한 항균 특성은 대장균(E. Coli)과 황색포도상구균(S. Aureus)을 사용하여 억제 영역을 확인하였다. Shell이 형성되면서 더 넓은 억제 영역이 형성되었고 이는 광 촉매 효율을 측정한 결과와 일치하는 것을 확인하였다.

Keywords

GOOOB2_2018_v29n6_710_f0001.png 이미지

Figure 1. XRD patterns of (a) ZnFe2O4 NPs with synthesis by using precipitation method, (b) ZnFe2O4@SnO2 core-shell NPs and (c) ZnFe2O4@SnO2@TiO2 core-shell NPs with synthesis by using sonochemical method.

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Figure 2. Magnetization hysteresis loops of (A) ZnFe2O4 NPs, (B) ZnFe2O4@SnO2 core-shell NPs and (C) ZnFe2O4@SnO2@TiO2 core-shell NPs.

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Figure 3. Absorption spectra of MB taken at different photocatalytic degradation times with (a) ZnFe2O4 NPs, (b) ZnFe2O4@SnO2 core-shell NPs and (c) ZnFe2O4@SnO2@TiO2 core-shell NPs.

GOOOB2_2018_v29n6_710_f0004.png 이미지

Figure 4. Photocatalytic degradation of MB in the presence of (A) ZnFe2O4 NPs, (B) ZnFe2O4@SnO2 core-shell NPs and (C) ZnFe2O4@SnO2@TiO2 core-shell NPs.

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Figure 5. Zone of inhibition of (A) ZnFe2O4 NPs, (B) ZnFe2O4@SnO2 core-shell NPs and (C) ZnFe2O4@SnO2@TiO2 core-shell NPs on the E. Coli and (A’) ZnFe2O4 NPs, (B’) ZnFe2O4@SnO2 core-shell NPs and (C’) ZnFe2O4@SnO2@TiO2 core-shell NPs on the S. Aureus.

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