Sepiolite/Cu2O/Cu photocatalyst: Preparation and high performance for degradation of organic dye

doi:10.1016/j.jmst.2018.03.023

Abstract

Abstract:

A novel ternary sepiolite/Cu₂O/Cu (SCC) nanocomposite was successfully synthesized by a facile one-pot method. The Cu₂O/Cu nanoparticles in the SCC nanocomposite are well dispersed on the sepiolite surface. It exhibited enhanced photocatalytic performance in the degradation of congo red (CR), remarkably superior to that of Cu₂O or Cu₂O/Cu nanoparticles. Elemental copper in the SCC serves as a good electron acceptor to promote the transfer of photo-generated electrons in Cu2O and suppress the recombination of the photo-generated electrons and holes of the composite. The enhanced photocatalytic efficiency is attributed to the synergistic effect of sepiolite and Cu₂O/Cu. This type of SCC nanocomposites is a promising candidate as photocatalytic material for environmental protection.

Key words: Sepiolite/Cu₂O/Cu, Nanocomposite, Photocatalytic, Organic dye

Peisan Wang, Chunxia Qi, Luyuan Hao, Pengchao Wen, Xin Xu. Sepiolite/Cu₂O/Cu photocatalyst: Preparation and high performance for degradation of organic dye[J]. J. Mater. Sci. Technol., 2019, 35(3): 285-291.

Figures/Tables 10

Scheme 1. Schematic presentation of SCC preparation procedure.

Fig. 1. XRD patterns of (a) sepiolite and (b) SCC.

Fig. 2. FT-IR spectra of (a) acidized sepiolite and (b) SCC.

Fig. 3. (a-c) SEM images of raw sepiolite, acid treated sepiolite and SCC, respectively, (d) EDX spectrum of the SCC.

Fig. 4. TEM images of (a) sepiolite and (b) SCC.

Fig. 5. (a, c) N2 adsorption/desorption isotherms and (b, d) BJH pore diameter distributions of sepiolite and SCC.

Fig. 6. XPS of SCC nanocomposites: (a) survey spectrum, (b) Cu 2p, (c) Cu LM2 Auger spectrum; (d) O1s.

Fig. 7. (a) UV-vis DRS spectrum and (b) (αhγ)2 vs. hγ plot of SCC.

Fig. 8. Absorption spectra of CR solution with irradiation time in the presence of (a) SCC nanocomposite and (b) sepiolite. (c) Photodegradation ratios of CR in the presence of sepiolite and SCC, (d) Absorption spectra of CR in the presence of Cu2O, Cu2O/Cu and SCC.

Fig. 9. Schematic illustration of the proposed photocatalytic degradation mechanism.

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Sepiolite/Cu₂O/Cu photocatalyst: Preparation and high performance for degradation of organic dye

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