University of Oulu

Shafqat, K.; Pitkäaho, S.; Tiainen, M.; Matějová, L.; Keiski, R.L. Effect of Nanoparticle Size in Pt/SiO₂ Catalyzed Nitrate Reduction in Liquid Phase. Nanomaterials 2021, 11, 195.

Effect of nanoparticle size in Pt/SiO₂ catalyzed nitrate reduction in liquid phase

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Author: Shafqat, Khawer1; Pitkäaho, Satu1; Tiainen, Minna1;
Organizations: 1Environmental and Chemical Engineering Research Unit, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland
2Institute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic
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Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.4 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2021
Publish Date: 2021-03-29


Effect of platinum nanoparticle size on catalytic reduction of nitrate in liquid phase was examined under ambient conditions by using hydrogen as a reducing agent. For the size effect study, Pt nanoparticles with sizes of 2, 4 and 8 nm were loaded silica support. TEM images of Pt nanoparticles showed that homogeneous morphologies as well as narrow size distributions were achieved during the preparation. All three catalysts showed high activity and were able to reduce nitrate below the recommended limit of 50 mg/L in drinking water. The highest catalytic activity was seen with 8 nm platinum; however, the product selectivity for N₂ was highest with 4 nm platinum. In addition, the possibility of PVP capping agent acting as a promoter in the reaction is highlighted.

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Series: Nanomaterials
ISSN: 2079-4991
ISSN-E: 2079-4991
ISSN-L: 2079-4991
Volume: 11
Issue: 1
Article number: 195
DOI: 10.3390/nano11010195
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
215 Chemical engineering
116 Chemical sciences
Funding: This work was carried out with the financial support of the Council of Oulu region from European Regional Development Fund in the project “Material and process development for water purification—Testing device equipped with on-line measurement as a part of the local research infrastructure—VesiMat” (A73144). Maa- ja Vesitekniikan tuki ry is also acknowledged for the personal grant. Lenka Matějová thanks to the support of EU structural funding in Operational Programme Research Development and Education, project No. CZ.02.1.01/0.0/0.0/16_019/0000853 “Institute of Environmental Technology—Excellent Research” and Large Research Infrastructure ENREGAT supported by the Ministry of Education, Youth and Sports of the Czech Republic under project No. LM2018098.
Copyright information: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (