Preparation by Grinding-calcination and Photocatalytic Performance of La2O3/BiOCl Composite Photocatalysts

doi:10.15541/jim20150075

Abstract

Abstract:

BiOCl nanoplates were firstly prepared by precipitation method and then La₂O₃/BiOCl composite photocatalysts with different La₂O₃ contents (1wt%, 2wt%, 4wt%, 8wt%) were synthesized by grinding-calcination procedure. The physical chemistry properties of the as-prepared photocatalysts were characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), UV-Vis diffuse reflectance spectroscope (DRS), X-ray photoelectron spectroscope (XPS), Fourier transformed infrared spectroscope (FT-IR), and photoluminescence (PL) spectroscope. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of high concentration acid orange II (40×10^-6) under UV light (λ=254 nm) irradiation. Results showed that the as-prepared samples have good crystallinity. La₂O₃ particles with the size of 2-5 nm were closely combined with BiOCl nanoplate after grinding-calcination treatment. La₂O₃/BiOCl composite photocatalysts with 1wt% La₂O₃ calcined at 200℃ displayed the best photocatalytic activity which is 2.4 times of that of pure BiOCl. The produced La₂O₃/BiOCl has abundant surface OH groups and highly suitable adsorption of dye. Moreover, La³⁺ could capture the photon-generated electrons (e^-) and prevent the recombination of photon-generated and holes (h⁺).

Key words: La2O3/BiOCl, photocatalysis, rare earth, high concentration dye, grinding-calcination

CLC Number:

TB321
O643

CHEN Jian-Chai, YU Chang-Lin, LI Jia-De, FANG Wen, HE Hong-Bo. Preparation by Grinding-calcination and Photocatalytic Performance of La₂O₃/BiOCl Composite Photocatalysts[J]. Journal of Inorganic Materials, 2015, 30(9): 943-949.

Figures/Tables 10

Fig. 1 XRD patterns of the prepared BiOCl and La2O3/BiOCl samples (a) La2O3/BiOCl with different La2O3 contents calcined at 200℃; (b) 1wt% La2O3/BiOCl calcined at different temperatures

Fig. 2 SEM images of the prepared BiOCl and La2O3/BiOCl samples (a) 1wt% La2O3/BiOCl(200℃); (b) 4wt% La2O3/BiOCl (200℃); (b) 8wt% La2O3/BiOCl (200℃); (d) 1wt% La2O3/BiOCl(500℃)

Fig. 3 TEM images of BiOCl (a) and 2wt% La2O3/BiOCl (200℃) (b)

Fig. 4 EDX pattern of the La2O3/BiOCl(200℃) sample

Fig. 5 UV-Vis DRS spectra of the prepared BiOCl and La2O3/BiOCl samples (a) La2O3/BiOCl with different La2O3 contents calcined at 200℃; (b) 1wt% La2O3/BiOCl calcined at different temperatures

Fig. 6 FT-IR spectra of the prepared BiOCl and La2O3/BiOCl samples (a) La2O3/BiOCl with different La2O3 content calcined at 200℃; (b) 1wt% La2O3/BiOCl calcined at different temperatures

Fig. 7 XPS spectra of 1wt%La2O3/BiOCl calcined at 200 ℃ (a) Full survey spectrum; (b) La3d; (c) Bi4f; (d) O1s; (e) Cl2p

Fig. 8 Activity comparison of the La2O3/BiOCl samples calcined at 200℃

Fig. 9 Activity comparison of the 1wt% La2O3/BiOCl samples calcined at different temperatures

Fig. 10 PL spectra of BiOCl and 1wt% La2O3/BiOCl (200℃) dispersed in 0.01 mol/L coumarin aqueous solution

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Preparation by Grinding-calcination and Photocatalytic Performance of La₂O₃/BiOCl Composite Photocatalysts

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