Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 594, Issue -, Pages 621-634Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.03.034
Keywords
Cerium dioxide; Photodegradation; Photoreduction; Graphene; Heterojunction
Categories
Funding
- National Natural Science Foundation of China [22078028, 21978026]
- Changzhou Key Laboratory of GrapheneBased Materials for Environment and Safety [CM20153006, CE20185043]
- Postgraduate Research Practice Innovation Program of Jiangsu Province [SJCX20_0958]
- PAPD of Jiangsu Higher Education Institution
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A ternary photocatalyst, CeO2/CdS/RGO, was synthesized and demonstrated high efficiency in photodegradation and photoreduction of various pollutants, attributed to the modification of CeO2 with CdS and the role of RGO; moreover, CeO2/CdS/RGO provides an effective pathway for the separation of photogenerated charge carriers.
Heterojunction photocatalyst with efficient photocatalytic performance can remarkably promote the separation of photogenerated charge carriers. Herein, a ternary photocatalyst, reduced graphene oxide (RGO) based CeO2 modified with CdS (CeO2/CdS/RGO), was synthesized by a simple one-step hydrothermal method as a bifunctional catalyst for both photodegradation and photoreduction. The ternary composite exhibited a 90.04% photodegradation efficiency to ciprofloxacin (CIP) under simulated sunlight irradiation for 2 h, much higher than CeO2 (54%). Moreover, CeO2/CdS/RGO showed broad applicability to the photodegradation of organic pollutants, including norfloxacin (NFX), tetracycline (TC), methylene blue (MB), rhodamine B (RhB), methyl violet (MV), methyl orange (MO) and reactive blue BES (RB). Besides, CeO2/CdS/RGO exhibited a 100.00% photoreduction efficiency to Cr(VI) within 60 min. The improvement of the photocatalytic performance is ascribed to the modification of CeO2 with CdS, which improves the separation efficiency of photogenerated carriers. Also, the modification with RGO inhibits the agglomeration of CeO2, improves the adsorption capacity toward pollutants and provides another nanochannel to separate photogenerated electron-hole (e --h(+)) pairs. Additionally, the photocatalytic mechanism of CeO2/CdS/RGO is explored. It is expected that this work would provide a promising way to construct efficient and versatile RGO-based photocatalysts applied to environmental remediation. (C) 2021 Elsevier Inc. All rights reserved.
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