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In relation to this article, we declare that there is no conflict of interest.
Publication history
Received March 19, 2023
Revised June 4, 2023
Accepted June 9, 2023
Acknowledgements
This work was conducted with research funds of the Research Grant of Kwangwoon University (2023) and the National Research Foundation of Korea (NRF-2022R1F1A1059495).
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Reusable Pd nanoparticle catalysts supported on KOH-activated waste coffee grounds for the catalytic reduction of 4-nitrophenol

1Department of Chemical Engineering, Kwangwoon University, Wolgye-dong, Nowon-gu, Seoul 01897, Korea 2Department of Chemistry, College of Science, Sultan Qaboos University, Muscat, Oman
rengaraj@squ.edu.om, korea1@kw.ac.kr
Korean Journal of Chemical Engineering, August 2023, 40(8), 1892-1900(9), 10.1007/s11814-023-1511-2
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Abstract

Waste coffee grounds (CGs) are typically incinerated or sent to landfills, which can pollute the environment. However, after chemical treatments, such as carbonization and KOH-activation, CGs can exhibit macroporous and microporous structures, besides high chemical stability and surface area (2,710 m2 /g). Thus, activated CGs (ACGs) may be used as catalyst supports. Herein, Pd nanoparticles (NPs) loaded with ACG catalysts were prepared by two different methods: immobilization of PdNPs on the support and in situ reduction of Pd ions to Pd metal in the support. The catalytic performance of the ACG-supported PdNPs for the reduction of 4-nitrophenol to 4-aminophenol was investigated. In the recycling test, the ACG-supported PdNP catalysts outperformed the unsupported PdNPs in terms of the stability and conversion efficiency. Thus, the as-prepared ACG support was determined to be a suitable candidate for aqueous catalytic reactions.

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