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Preparation and Synergy of Supported Ru0 and Pd0 for Rapid Chlorate Reduction at pH 7.


ABSTRACT: Chlorate (ClO3-) is a common water pollutant due to its gigantic scale of production, wide applications in agriculture and industry, and formation as a toxic byproduct in various water treatment processes. This work reports on the facile preparation, mechanistic elucidation, and kinetic evaluation of a bimetallic catalyst for highly active ClO3- reduction into Cl-. Under 1 atm H2 and 20 °C, PdII and RuIII were sequentially adsorbed and reduced on a powdered activated carbon support, affording Ru0-Pd0/C from scratch within only 20 min. The Pd0 particles significantly accelerated the reductive immobilization of RuIII as >55% dispersed Ru0 outside Pd0. At pH 7, Ru-Pd/C shows a substantially higher activity of ClO3- reduction (initial turnover frequency >13.9 min-1 on Ru0; rate constant at 4050 L h-1 gmetal-1) than reported catalysts (e.g., Rh/C, Ir/C, Mo-Pd/C) and the monometallic Ru/C. In particular, Ru-Pd/C accomplished the reduction of concentrated 100 mM ClO3- (turnover number > 11,970), whereas Ru/C was quickly deactivated. In the bimetallic synergy, Ru0 rapidly reduces ClO3- while Pd0 scavenges the Ru-passivating ClO2- and restores Ru0. This work demonstrates a simple and effective design for heterogeneous catalysts tailored for emerging water treatment needs.

SUBMITTER: Gao J 

PROVIDER: S-EPMC9996829 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature

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Preparation and Synergy of Supported Ru<sup>0</sup> and Pd<sup>0</sup> for Rapid Chlorate Reduction at pH 7.

Gao Jinyu J   Xie Shaohua S   Liu Fudong F   Liu Jinyong J  

Environmental science & technology 20230221 9


Chlorate (ClO<sub>3</sub><sup>-</sup>) is a common water pollutant due to its gigantic scale of production, wide applications in agriculture and industry, and formation as a toxic byproduct in various water treatment processes. This work reports on the facile preparation, mechanistic elucidation, and kinetic evaluation of a bimetallic catalyst for highly active ClO<sub>3</sub><sup>-</sup> reduction into Cl<sup>-</sup>. Under 1 atm H<sub>2</sub> and 20 °C, Pd<sup>II</sup> and Ru<sup>III</sup> wer  ...[more]

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