Photocatalytic Degradation Activity of BaTiO3 Nanoparticles Modified with Au in Simulated Sunlight

doi:10.11901/1005.3093.2016.222

Chinese Journal of Materials Research

2017, Vol. 31

Issue (2): 102-109 DOI: 10.11901/1005.3093.2016.222

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Photocatalytic Degradation Activity of BaTiO₃ Nanoparticles Modified with Au in Simulated Sunlight

Tao XIAN¹(

),Lijing DI^1,²,Jun MA¹,Cuicui SANG¹,Xuegang WEI¹,Yongjie ZHOU¹

1 Department of Physics, Qinghai Normal University, Xining 810008,China
2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

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Tao XIAN,Lijing DI,Jun MA,Cuicui SANG,Xuegang WEI,Yongjie ZHOU. Photocatalytic Degradation Activity of BaTiO₃ Nanoparticles Modified with Au in Simulated Sunlight. Chinese Journal of Materials Research, 2017, 31(2): 102-109.

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Abstract

BaTiO₃ nanoparticles were fabricated by gel method with polyacrylamide as raw material, and then Au nanoparticles were deposited on the surface of BaTiO₃ via a photocatalytic reduction method to yield Au/BaTiO₃ composite photocatalysts. The composite photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) and photoluminescence (PL) spectroscopy. The results show that the BaTiO₃ particles undergo no structural change after the deposition of gold; The Au particles with size of 5-20 nm were deposited on the surface of BaTiO₃ particles with an average size of ~55 nm; The composites present light absorbance centered around 560 nm due to the surface plasmon resonance (SPR) effect of Au nanoparticles; The Au/BaTiO₃ composites exhibit a reduction in recombination probability of photo-generated electrons and holes compared to bare BaTiO₃. In addition, the formation mechanism for Au nanoparticles on the surface of BaTiO₃particles is proposed. The photocatalytic activity of the as-prepared composite photocatalyst was evaluated by the degradation of methylene blue (MB) under simulated sunlight irradiation, and the photocatalytic stability of the composites was also investigated. The results reveal that the photocatalytic activity of BaTiO₃can be improved by the deposition of appropriate amount of gold, and moreover the composite photocatalyst exhibits good reusability. Finally, the promotion mechanism of Au particles on the simulated sunlight photocatalytic activity of BaTiO₃ is also discussed.

Key words: photocatalysis BaTiO3 nanoparticles Au modification

Received: 22 April 2016

Fund: Supported by National Natural Science Foundation of China (Nos.51602170 & 11164022), “Chun Hui” Cooperation Project of Chinese Ministry of Education (No.Z2015046), Natural Science Foundation of Qinghai Province (No.2016-ZJ-954Q), Youth Science Foundation of Qinghai Normal University

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	Tao XIAN
	Lijing DI
	Jun MA
	Cuicui SANG
	Xuegang WEI
	Yongjie ZHOU

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.222 OR https://www.cjmr.org/EN/Y2017/V31/I2/102

Fig.1 XRD patterns of BaTiO₃ and 0.9Au/BaTiO₃ sample and standard XRD pattern for BaTiO₃

Fig.2 TEM images of BaTiO₃and 0.9Au/BaTiO₃ (a, b); EDX spectra of BaTiO₃ and 0.9Au/BaTiO₃ (c, d) and HRTEM image of 0.9Au/BaTiO₃ (e)

Fig.3 Schematic illustration of the formation mechanism for Au/BaTiO₃

Fig.4 UV-visible diffuse reflectance spectra of the BaTiO₃and Au/BaTiO₃sample(a) and the corresponding first derivative of the spectra (b)

Fig.5 PL emission spectra of BaTiO₃and 0.9Au/BaTiO₃ sample

Fig.6 Photocatalytic degradation of MB using BaTiO₃and Au/BaTiO₃under simulated sunlight irradiation (a), adsorption of MB on the prepared samples (b) and Photocatalytic degradation of MB using BaTiO₃and 0.9Au/BaTiO₃under visible light irradiation (c)

Fig.7 Cycling runs for the photocatalytic degradation of MB over 0.9Au/BaTiO₃ sample

Fig.8 Schematic illustration of the promotion mechanism of Au particles on the simulated sunlight photocatalytic activity of BaTiO₃

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