High-efficiency reduction of p -nitrophenol on green-synthesized gold nanoparticles decorated on ceria nanorods

A green synthesis using extract from Citrus maxima peel was developed to fabricate Au–Ce catalysts for the reduction of p -nitrophenol (PNP). Au nanoparticles with a diameter of 6.6 ± 2.5 nm were deposited onto the surface of CeO 2 nanorods with a length of 33.1 ± 15.0 nm and a diameter of 7.1 ± 2.1...

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Bibliographic Details
Published in:RSC advances 2022-09, Vol.12 (39), p.25753-25763
Main Authors: Gia-Thien Ho, Thanh, Do, Ba Long, Pham, Bao Van, Nguyen, Thi Thuy Van, Phan, Hong Phuong, Nguyen, Hoang Bao, Vo, Pham Phuong Trang, Tri, Nguyen
Format: Article
Language:English
Subjects:
Aminophenol
Catalysts
Cerium oxides
Chemical synthesis
Chemistry
Gold
Nanoparticles
Nanorods
Nitrophenol
Reduction
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Summary:A green synthesis using extract from Citrus maxima peel was developed to fabricate Au–Ce catalysts for the reduction of p -nitrophenol (PNP). Au nanoparticles with a diameter of 6.6 ± 2.5 nm were deposited onto the surface of CeO 2 nanorods with a length of 33.1 ± 15.0 nm and a diameter of 7.1 ± 2.1 nm. The mesoporous and non-porous capillary structures of these materials were observed. The interaction between Au and CeO 2 increased the specific surface area, pore diameter, and pore volume compared with pure CeO 2 (90 m 2 g −1 , 23.8 Å, and 0.110 cm 3 g −1 versus 72 m 2 g −1 , 23.0 Å, and 0.089 cm 3 g −1 ). The splitting peaks of the surface oxygen and their shifting at lower temperatures compared with CeO 2 nanorods were found thanks to the Au–CeO 2 interaction, suggesting that their reduction occurred more easily. The synthesized Au–Ce catalysts exhibited excellent activity in the reduction of PNP to p -aminophenol. The 0.2Au–Ce catalyst was the most efficient one for PNP reduction, enabling the conversion of PNP in 30 minutes with a catalyst concentration of 20 mg L −1 and a PNP/NaBH 4 molar ratio of 1/200. Moreover, the 0.2Au–Ce catalyst could be reused for at least five consecutive cycles without considerable loss of its activity.
ISSN:2046-2069
2046-2069
DOI:10.1039/d2ra04557e