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Ti-dopant-enhanced photocatalytic activity of a CaFe2O4/MgFe2O4 bulk heterojunction under visible-light irradiation

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Abstract

The effect substitution of Ti4+ at the Fe4+ site in a CaFe2O4-MgFe2O4 bulk hetero-junction (BH) lattice photocatalyst was explored and the Ti ion concentration was optimized to fabricate an efficient photocatalyst. A BH consisting of an optimum dopant concentration (Ti+4) level of x = 0.03 exhibited an increased band gap and generated a 1.5 times higher photocurrent. The newly fabricated Ti ion doped photocatalyst showed an enhanced quantum yield (upto ∼13.3%) for photodecomposition of a H2O-CH3OH mixture, as compared to its undoped BH counterpart under visible light (λ ≥ 420 nm). In contrast, the material doped with a very high Ti-dopant concentration displayed deteriorated photochemical properties. An efficient charge-separation induced by Ti-ion doping seems to be responsible for the higher photocatalytic activity in a doped bulk BH.

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Authors and Affiliations

  1. International Advanced Research Center for Powder Metallurgy and New Materials, Balapur PO, Hyderabad, AP, 500 005, India

    Pramod H. Borse

  2. Department of Chemical Engineering and School of Environmental Science & Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Jae Young Kim & Jae Sung Lee

  3. Department of Imaging System Engineering, Pukyong National University, Busan, 609-735, Korea

    Kwon Taek Lim

  4. Division of High Technology Materials Research, Korea Basic Science Institute (KBSI), Busan, 618-230, Korea

    Euh Duck Jeong, Jong Seong Bae, Jang-Hee Yoon, Seong Mi Yu & Hyun Gyu Kim

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  1. Pramod H. Borse
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  2. Jae Young Kim
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  3. Jae Sung Lee
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  4. Kwon Taek Lim
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  5. Euh Duck Jeong
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  6. Jong Seong Bae
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  7. Jang-Hee Yoon
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  8. Seong Mi Yu
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  9. Hyun Gyu Kim
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Correspondence to Hyun Gyu Kim.

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Borse, P.H., Kim, J.Y., Lee, J.S. et al. Ti-dopant-enhanced photocatalytic activity of a CaFe2O4/MgFe2O4 bulk heterojunction under visible-light irradiation. Journal of the Korean Physical Society 61, 73–79 (2012). https://doi.org/10.3938/jkps.61.73

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