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. 2019 Feb 26;4(2):4243-4251.
doi: 10.1021/acsomega.8b03298. eCollection 2019 Feb 28.

Facet-Dependent Photodegradation of Methylene Blue Using Pristine CeO2 Nanostructures

Deblina Majumder  1 , Indranil Chakraborty  2 , Kalyan Mandal  2 , Somenath Roy  1
Affiliations

Facet-Dependent Photodegradation of Methylene Blue Using Pristine CeO2 Nanostructures

Deblina Majumder et al. ACS Omega. .

Abstract

This work comprises the shape- and facet-dependent catalytic efficacies of different morphologies of CeO2, namely, hexagonal, rectangular, and square. The formation of different shapes of CeO2 is controlled using polyvinyl pyrrolidone as a surfactant. The surface reactivity of formation of differently exposed CeO2 facets is thoroughly investigated using UV-visible, photoluminescence, Raman, and X-ray photoelectron spectroscopies. A correlation between the growth of a surface-reactive facet and the corresponding oxygen vacancies is also established. Considering the tremendous contamination, caused by the textile effluents, the present study articulates the facet-dependent photocatalytic activities of pristine CeO2 for complete degradation of methylene blue within 175 min. The observed degradation time deploying pristine CeO2 as a catalyst is the shortest to be reported in the literature to our best knowledge.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Morphological analysis, (a–c) TEM micrographs of hexagonal, rectangular, and cuboidal ceria with {111}, {110}, and {100} exposed facets, namely, Ce-1, Ce-2, and Ce-3, respectively, (d–f) HRTEM images, showing the lattice fringes of (111), (110), and (100) plane (inset FFT) of the mentioned Ce-1, Ce-2, and Ce-3, respectively.
Figure 2
Figure 2
Nitrogen adsorption–desorption isotherm of Ce-3 with inset pore size distribution.
Figure 3
Figure 3
(a) UV–vis spectroscopy and (b) Schuster–Kubelka–Munk absorption function of CeO2 nanostructures, showing the band gap energies of different shapes of ceria.
Figure 4
Figure 4
PL spectroscopy of different shapes of CeO2 nanostructures.
Figure 5
Figure 5
Raman spectroscopy of different shapes of CeO2 nanostructures, Ce-1, Ce-2 and Ce-3.
Figure 6
Figure 6
(a–c) Ce 3d core-level XPS peaks of Ce-1, Ce-2, and Ce-3, respectively.
Figure 7
Figure 7
(a–c) O 1s core-level XPS peaks of Ce-1, Ce-2, and Ce-3, respectively.
Figure 8
Figure 8
(a–c) MB degradation under the UV source using Ce-1, Ce-2, and Ce-3, respectively.
Figure 9
Figure 9
(a–c) MB degradation under dark using Ce-1, Ce-2, and Ce-3, respectively.
Figure 10
Figure 10
MB degradation under dark without using a catalyst.
Figure 11
Figure 11
(a) Rate of degradation of MB in UV light in the presence of Ce-3 and (b) recyclability test of the same using Ce-3 as a catalyst.
Figure 12
Figure 12
(a) Mass spectroscopic results before (a) and after (b) degradation of MB.
See this image and copyright information in PMC

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