Clean Technology (청정기술)

The Korean Society of Clean Technology (한국청정기술학회)
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Photocatalytic Decomposition of Rhodamine B over BiVO4 Doped with Samarium Ion

Sm 이온이 도핑된 BiVO4에서 로다민 B의 광촉매 분해 반응

  • Hong, Seong-Soo (Department of Chemical Engineering, Pukyong National University)
  • 홍성수 (부경대학교 화학공학과)
  • Received : 2021.03.12
  • Accepted : 2021.04.15
  • Published : 2021.06.30
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Abstract

Pure and Sm ion doped BiVO4 catalysts were synthesized using a conventional hydrothermal method and characterized by XRD, DRS, SEM, and PL. We also examined the activity of these materials on the photocatalytic decomposition of rhodamine B under visible light irradiation. The doping of Sm ion into BiVO4 catalyst changed the ms-BiVO4 crystal structure into the tz-BiVO4 crystal structure in the low synthesis temperature. Light absorption analysis using DRS showed that all the catalysts displayed strong absorption in the visible range of the electromagnetic spectrum regardless of Sm ion doping. In addition, an amorphous morphology was shown in the pure BiVO4 catalyst, but the morphology of the BiVO4 catalyst doped with Sm ion was changed into an ellipse shape and also the particle size decreased. In the photocatalytic decomposition of rhodamine B, Sm ion doped BiVO4 catalyst showed higher photocatalytic activity than the pure BiVO4 catalyst. In addition, the Sm3-BVO catalyst doped with 3% Sm ion showed the highest photocatalytic activity, as well as the highest formation rate of OH radicals (•OH) and the highest PL peak. This result suggests that the formation rate of OH radicals produced in the interface between the photocatalyst and water is well correlated with the photocatalytic activity.

순수한 BiVO4 및 Sm 이온이 도핑된 BiVO4 촉매들을 수열합성법으로 제조하였고, 그들의 물리적 성질을 XRD, DRS, SEM 및 PL 등을 사용하여 특성분석을 하였다. 또한, 가시광 조사 하에서 로다민 B의 분해반응에서 광촉매로서의 활성을 조사하였다. Sm 이온의 첨가는 낮은 온도에서도 촉매의 결정구조를 ms-BiVO4 구조에서 tz-BiVO4로 변화시켰다. 흡광도 분석결과로 부터 모든 촉매들은 Sm 이온의 도핑과 관련없이 가시광 영역에서 흡수스펙트럼을 보여주고 있다. 또한 순수한 BiVO4 촉매는 무정형의 형상을 보여주고 있으나 Sm 이온이 첨가되면 그 입자들의 형상이 타원형으로 변화하였으며 입자의 크기가 줄어 들었다. 로다민 B의 광분해 반응에서 순수한 BiVO4 촉매에 비해 Sm 이온이 첨가된 촉매들의 광분해 활성이 증가하였다. 또한, 3%로 도핑된 Sm3-BVO 촉매가 가장 높은 활성을 보일 뿐만 아니라 가장 높은 수산기 라디칼의 생성속도와 가장 큰 PL피크 세기를 나타내었다. 이 결과는 촉매와 물의 계면에서 얻어지는 수산기 라디칼(•OH)의 생성속도는 광촉매 활성과 밀접한 연관성이 있다는 것을 의미한다.

Keywords

Acknowledgement

이 논문은 부경대학교 자율창의학술연구비(2021년)에 의하여 연구되었음.

References

  1. Matsuda, S., and Kato, A., "Titanium Oxide Based Ctalysts-a Review," Appl. Catal., 8, 149-165 (1983). https://doi.org/10.1016/0166-9834(83)80076-1
  2. Tokunaga, S., Kato, H., and Kudo, A., "Selective Preparation of Monoclinic and Tetragonal BiVO4 with Scheelite Structure and Their Photocatalytic Properties," Chem. Mater., 13, 4624-4628 (2001). https://doi.org/10.1021/cm0103390
  3. Liu, Y., Huang, B., Dai, Y., Zhang, X., Qin, X., Jiang, M., and Whangbo, M.-H., "Selective Ethanol Formation from Photocatalytic Reduction of Carbon Dioxide in Water with BiVO4 Photocatalyst," Catal. Commun., 11(3), 210-213 (2009). https://doi.org/10.1016/j.catcom.2009.10.010
  4. Kudo, A., Steinberg, M., Bard, A. J., Campton, A., Fox, M. A., Mallouk, T. E., Webber, S. E., and White, J. M., "Photoactivity of Ternary Lead-group IVB Oxides for Hydrogen and Oxygen Evolution," Catal. Lett., 5(1), 61-65 (1990). https://doi.org/10.1007/BF00772094
  5. Xi, G., and Ye, J., "Synthesis of Bismuth Vanadate Nanoplates with Exposed {001} Facets and Enhanced Visible-light Photocatalytic Properties," Chem. Commun., 46, 1893-1895 (2010). https://doi.org/10.1039/b923435g
  6. Kohtani, S., Koshiko, M., Kudo, A., Tokumura, K., Ishigaki, Y., Toriba, A., Hayakawa, K., and Nakagaki, R., "Photodegradation of 4-Alkylphenols Using BiVO4 Photocatalyst under Irradiation with Visible Light from a Solar Simulator," Appl. Catal. B, 46, 573-586 (2003). https://doi.org/10.1016/S0926-3373(03)00320-5
  7. Zhou, B., Zhao, X., Liu, H., Qu, J., and Huang, C. P., "Synthesis of Visible-light Sensitive M-BiVO4 (M=Ag, Co, and Ni) for the Photocatalytic Degradation of Organic Pollutants," Separ. & Purifi. Tech., 77(3), 275-282 (2011). https://doi.org/10.1016/j.seppur.2010.12.017
  8. Bian, Z., Zhu, Y., Zhang, J., Ding, A., and Wang, H., "Visible-light Driven Degradation of Ibuprofen Using Abundant Metal-loaded BiVO4 Photocatalysts," Chemosphere, 117, 527-531 (2014). https://doi.org/10.1016/j.chemosphere.2014.09.017
  9. Xu, H., Wu, C., Li, H., Chu, J., Sun, G., Xu, Y., and Yan, Y., "Synthesis, Characterization and Photocatalytic Activities of Rare Earth-loaded BiVO4 Catalysts," Appl. Surf. Sci. 256(3), 597-602 (2009). https://doi.org/10.1016/j.apsusc.2009.05.102
  10. Obregon, S., and Colon, G., "Heterostructured Er3+ Doped BiVO4 with Exceptional Photocatalytic Performance by Cooperative Electronic and Luminescence Sensitization Mechanism," Appl. Catal. B, 158, 242-249 (2014). https://doi.org/10.1016/j.apcatb.2014.04.029
  11. Yu, J., Wang, W., Cheng, B., and Su, B. L., "Enhancement of Photocatalytic Activity of Mesporous TiO2 Powders by Hydrothermal Surface Fluorination Treatment," J. Phys. Chem. C, 113(16), 6743-6750 (2009). https://doi.org/10.1021/jp900136q
  12. Fan, H. M., Jiang, T. F., Li, H. Y., Wang, D. D., Wang, L. L., Zhai, Z. L., He, D. Q., Wang, P., and Xie, T. F., "Effect of BiVO4 Crystalline Phases on the Photoinduced Carriers Behaviorand Photocatalytic Activity," J. Phys. Chem. C, 116(3), 2425-2430 (2012). https://doi.org/10.1021/jp206798d
  13. Zhang, X., Ai, Z. H., Jia, F. L., Zhang, Z. Z., Fan, X. X., and Zou, Z. G., "Selective Synthesis and Visible-light Photocatalytic Activities of BiVO4 with Different Crystalline Phases," Mater. Chem. Phys., 103(1), 162-167 (2007). https://doi.org/10.1016/j.matchemphys.2007.02.008
  14. He, Z. Q., Shi, Y. Q., Gao, C., Wen, L. M., Chen, J. M., and Song, S., "BiOCl/BiVO4 p-n Hetero-junction with Enhanced Photocatalytic Activity under Visible-light Irradiation," J. Phys. Chem. C, 118(1), 389-398 (2014). https://doi.org/10.1021/jp409598s
  15. Jung, Y. S., Baek, S. H., Lim, K. T., Park, S. S., Lee, G. D., and Hong, S. S., "Synthesis of Ti-containing SBA-15 Materials and Studies on Their Photocatalytic Decomposition of Orange II," Catal. Today, 131, 437-443 (2008). https://doi.org/10.1016/j.cattod.2007.10.072