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Optimization of sol-immobilized bimetallic Au–Pd/TiO2 catalysts: reduction of 4-nitrophenol to 4-aminophenol for wastewater remediation

Khaled Alshammari, Yubiao Niu, Richard Palmer Orcid Logo, Nikolaos Dimitratos

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Volume: 378, Issue: 2176, Start page: 20200057

Swansea University Author: Richard Palmer Orcid Logo

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DOI (Published version): 10.1098/rsta.2020.0057

Abstract

A sol-immobilization method is used to synthesize a series of highly active and stable AuxPd1−x/TiO2 catalysts (where x = 0, 0.13, 0.25, 0.5, 0.75, 0.87 and 1) for wastewater remediation. The catalytic performance of the materials was evaluated for the catalytic reduction of 4-nitrophenol, a model w...

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Published in: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
ISSN: 1364-503X 1471-2962
Published: The Royal Society 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa54694
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Abstract: A sol-immobilization method is used to synthesize a series of highly active and stable AuxPd1−x/TiO2 catalysts (where x = 0, 0.13, 0.25, 0.5, 0.75, 0.87 and 1) for wastewater remediation. The catalytic performance of the materials was evaluated for the catalytic reduction of 4-nitrophenol, a model wastewater contaminant, using NaBH4 as the reducing agent under mild reaction conditions. Reaction parameters such as substrate/metal and substrate/reducing agent molar ratios, reaction temperature and stirring rate were investigated. Structure-activity correlations were studied using a number of complementary techniques including X-ray powder diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy. The sol-immobilization route provides very small Au–Pd alloyed nanoparticles, with the highest catalytic performance shown by the Au0.5Pd0.5/TiO2 catalyst.This article is part of a discussion meeting issue ‘Science to enable the circular economy’.
Issue: 2176
Start Page: 20200057